{"id":503,"date":"2026-07-30T21:49:29","date_gmt":"2026-07-30T21:49:29","guid":{"rendered":"https:\/\/blog.tutorai.me\/?p=503"},"modified":"2026-11-02T06:51:07","modified_gmt":"2026-11-02T06:51:07","slug":"best-ai-detectors-for-essays","status":"publish","type":"post","link":"https:\/\/blog.tutorai.me\/best-ai-detectors-for-essays\/","title":{"rendered":"The 9 Best AI Detectors for Essays: Which Should You Choose?"},"content":{"rendered":"<section id=\"tai-ep-chart-1\" class=\"tai-ep-chart\" aria-label=\"Platform comparison\" style=\"--tai-card-width:320px;\">\n <div class=\"comparison comparison-slider\">\n  <div class=\"comparison-slider__header\">\n   <div class=\"comparison-slider__nav-controls\" hidden>\n    <button type=\"button\" class=\"comparison-slider__nav\" data-direction=\"-1\" aria-label=\"Previous platforms\" aria-controls=\"tai-ep-chart-1-items\"><svg viewBox=\"0 0 24 24\" width=\"20\" height=\"20\" aria-hidden=\"true\"><path d=\"m15 18-6-6 6-6\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"\/><\/svg><\/button>\n    <button type=\"button\" class=\"comparison-slider__nav\" data-direction=\"1\" aria-label=\"Next platforms\" aria-controls=\"tai-ep-chart-1-items\"><svg viewBox=\"0 0 24 24\" width=\"20\" height=\"20\" aria-hidden=\"true\"><path d=\"m9 18 6-6-6-6\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"\/><\/svg><\/button>\n   <\/div>\n  <\/div>\n  <div id=\"tai-ep-chart-1-items\" class=\"comparison__container\" role=\"region\" aria-label=\"Comparison cards. Scroll horizontally to see more platforms.\" tabindex=\"0\">\n      <article class=\"comparison__item\" aria-label=\"Pangram\">\n    <div class=\"comparison__rank-badge\">\n     <span class=\"comparison__rank-number\" aria-label=\"Rank 1\">1<\/span>     <span class=\"comparison__rank-title\">Best Overall<\/span>\n    <\/div>\n        <div class=\"comparison__logo\"><img decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/blog.tutorai.me\/wp-content\/uploads\/2026\/11\/pangram-logo-150x150.png\" class=\"comparison__logo-img\" alt=\"Pangram logo\" loading=\"lazy\" srcset=\"https:\/\/blog.tutorai.me\/wp-content\/uploads\/2026\/11\/pangram-logo-150x150.png 150w, https:\/\/blog.tutorai.me\/wp-content\/uploads\/2026\/11\/pangram-logo.png 256w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/div>\n        <h3 class=\"comparison__title\">Pangram<\/h3>\n            <a class=\"comparison__btn comparison__btn--primary\" href=\"https:\/\/www.pangram.com\/pricing\" rel=\"nofollow noopener\" target=\"_blank\" aria-label=\"See pricing \u2014 Pangram\">See pricing<\/a>\n        <a class=\"comparison__btn comparison__btn--link\" href=\"https:\/\/affiliate.pangram.com\/b4m9mcquz0sa\" rel=\"nofollow noopener\" target=\"_blank\" aria-label=\"Visit Pangram \u2014 Pangram\">Visit Pangram \u2192<\/a>\n        <div class=\"comparison__pricing\"><p>Free: 2,000 words a day<br \/>\n$20-$65 per month<\/p>\n<\/div>    <div class=\"comparison__features\"><ul>\r\n<li>Sentence-level highlights show how AI was used<\/li>\r\n<li>Lowest false positive rate (1 in 10,000)<\/li>\r\n<li>LMS, Google Docs and Chrome integrations<\/li>\r\n<\/ul><\/div>    <div class=\"comparison__badge\"><span aria-hidden=\"true\">\u2713<\/span> Lowest false positives<\/div>   <\/article>\n      <article class=\"comparison__item\" aria-label=\"Copyleaks\">\n    <div class=\"comparison__rank-badge\">\n     <span class=\"comparison__rank-number\" aria-label=\"Rank 2\">2<\/span>     <span class=\"comparison__rank-title\">Best for integrations<\/span>\n    <\/div>\n        <div class=\"comparison__logo\"><img decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/blog.tutorai.me\/wp-content\/uploads\/2026\/11\/copyleaks-logo-150x150.png\" class=\"comparison__logo-img\" alt=\"Copyleaks logo\" loading=\"lazy\" srcset=\"https:\/\/blog.tutorai.me\/wp-content\/uploads\/2026\/11\/copyleaks-logo-150x150.png 150w, https:\/\/blog.tutorai.me\/wp-content\/uploads\/2026\/11\/copyleaks-logo.png 256w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/div>\n        <h3 class=\"comparison__title\">Copyleaks<\/h3>\n            <a class=\"comparison__btn comparison__btn--primary\" href=\"https:\/\/copyleaks.com\/pricing\" rel=\"nofollow noopener\" target=\"_blank\" aria-label=\"See pricing \u2014 Copyleaks\">See pricing<\/a>\n        <a class=\"comparison__btn comparison__btn--link\" href=\"https:\/\/copyleaks.com\/\" rel=\"nofollow noopener\" target=\"_blank\" aria-label=\"Visit Copyleaks \u2014 Copyleaks\">Visit Copyleaks \u2192<\/a>\n        <div class=\"comparison__pricing\"><p>Personal: $16.99 per month<br \/>\n$13.99 per month billed annually<\/p>\n<\/div>    <div class=\"comparison__features\"><ul>\r\n<li>Canvas, Moodle, Blackboard, Classroom and more<\/li>\r\n<li>AI detection and plagiarism in one report<\/li>\r\n<li>30+ languages, multiple-file uploads<\/li>\r\n<\/ul><\/div>       <\/article>\n      <article class=\"comparison__item\" aria-label=\"Turnitin\">\n    <div class=\"comparison__rank-badge\">\n     <span class=\"comparison__rank-number\" aria-label=\"Rank 3\">3<\/span>     <span class=\"comparison__rank-title\">Best for schools<\/span>\n    <\/div>\n        <div class=\"comparison__logo\"><img decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/blog.tutorai.me\/wp-content\/uploads\/2026\/11\/turnitin-logo-150x150.png\" class=\"comparison__logo-img\" alt=\"Turnitin logo\" loading=\"lazy\" srcset=\"https:\/\/blog.tutorai.me\/wp-content\/uploads\/2026\/11\/turnitin-logo-150x150.png 150w, https:\/\/blog.tutorai.me\/wp-content\/uploads\/2026\/11\/turnitin-logo.png 256w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/div>\n        <h3 class=\"comparison__title\">Turnitin<\/h3>\n            <a class=\"comparison__btn comparison__btn--primary\" href=\"https:\/\/www.turnitin.com\/solutions\/topics\/ai-writing\/\" rel=\"nofollow noopener\" target=\"_blank\" aria-label=\"See AI detection \u2014 Turnitin\">See AI detection<\/a>\n        <a class=\"comparison__btn comparison__btn--link\" href=\"https:\/\/www.turnitin.com\/\" rel=\"nofollow noopener\" target=\"_blank\" aria-label=\"Visit Turnitin \u2014 Turnitin\">Visit Turnitin \u2192<\/a>\n        <div class=\"comparison__pricing\"><p>Institutional quote<br \/>\nAI detection needs the right license<\/p>\n<\/div>    <div class=\"comparison__features\"><ul>\r\n<li>Works inside your school\u2019s existing system<\/li>\r\n<li>AI Writing Report for 300 to 30,000 words<\/li>\r\n<li>AI and similarity scores side by side<\/li>\r\n<\/ul><\/div>       <\/article>\n     <\/div>\n <\/div>\n<\/section>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Pangram is our first choice for teachers<\/strong>, thanks to sentence-level highlights that show how AI was involved, the lowest false positive rate we have seen, and integrations with the major learning management systems. GPTZero\u2019s free monthly allowance still makes it a reasonable place for an individual teacher to start. For a department that wants checking inside its learning management system, Copyleaks is the more practical starting point. If your school already uses Turnitin, check whether its AI detection add-on is included before buying something else.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The best AI detectors for essays help you decide what needs a closer look. <strong>No detector proves authorship<\/strong>, and a score shouldn\u2019t decide a student\u2019s grade or trigger a penalty on its own.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Below, we compare nine options to help you find one that fits your teaching, workload, and budget.<\/p>\n\n\n\n<!--more-->\n\n\n\n<h2 id=\"ras-blocks-\" class=\"wp-block-heading\">Key Takeaways<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>For most teachers:<\/strong> Pangram gives the clearest picture of how AI was used in an essay, with the lowest false positive rate of the tools here.<\/li>\n\n\n\n<li><strong>For a free starting point:<\/strong> GPTZero\u2019s monthly allowance covers occasional checks before you commit to a subscription.<\/li>\n\n\n<li><strong>For school-wide use:<\/strong> Prioritize approved access and integrations through Copyleaks or Turnitin.<\/li>\n\n\n<li><strong>For occasional checks:<\/strong> Scribbr works without an account; QuillBot adds explanations of flagged text.<\/li>\n\n\n<li><strong>For specialist tasks:<\/strong> Consider Originality.ai for bulk scanning and Winston AI for scanned or handwritten submissions.<\/li>\n<\/ul>\n\n\n\n<h2 id=\"ras-blocks-\" class=\"wp-block-heading\">Best AI Detectors for Essays Compared<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Prices below are in USD, checked October 23, 2026, and exclude temporary promotions. Annual rates are monthly equivalents billed annually.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\">\n<thead>\n<tr>\n<th>Tool<\/th>\n<th>Best for<\/th>\n<th>Access<\/th>\n<th>Paid option or main limit<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>Pangram<\/strong><\/td>\n<td>Best overall<\/td>\n<td>Free plan for 2,000 words and 3 image checks a day<\/td>\n<td>Starts at $20 per month for 300,000 words and 100 image scans<\/td>\n<\/tr>\n<tr>\n<td><strong>Copyleaks<\/strong><\/td>\n<td>Classroom integrations<\/td>\n<td>Individual and Education plans<\/td>\n<td>Personal: $16.99\/month or $13.99\/month annually; Education quoted separately<\/td>\n<\/tr>\n<tr>\n<td><strong>Turnitin<\/strong><\/td>\n<td>Schools with existing access<\/td>\n<td>Institutional license required<\/td>\n<td>Institutional quote; AI detection requires appropriate licensing<\/td>\n<\/tr>\n<tr>\n<td><strong>Originality.ai<\/strong><\/td>\n<td>Bulk checks<\/td>\n<td>Limited free access<\/td>\n<td>Pro: $14.95\/month or $12.95\/month annually<\/td>\n<\/tr>\n<tr>\n<td><strong>Scribbr<\/strong><\/td>\n<td>No-account checks<\/td>\n<td>Unlimited checks, 1,200 words each<\/td>\n<td>Paid document checking supports reports up to 25,000 words<\/td>\n<\/tr>\n<tr>\n<td><strong>QuillBot<\/strong><\/td>\n<td>Flagged-text explanations<\/td>\n<td>1,200 words\/scan, six scans\/day<\/td>\n<td>Premium: $8.33\/month annually<\/td>\n<\/tr>\n<tr>\n<td><strong>Winston AI<\/strong><\/td>\n<td>Scans and reports<\/td>\n<td>14-day trial, 2,000 credits<\/td>\n<td>Essential: $18\/month or $10\/month annually<\/td>\n<\/tr>\n<tr>\n<td><strong>GPTZero<\/strong><\/td>\n<td>Individual teachers<\/td>\n<td>10,000 words\/month<\/td>\n<td>Premium: $12.99\/month annually; public scanner has a separate character limit<\/td>\n<\/tr>\n<tr>\n<td><strong>ZeroGPT<\/strong><\/td>\n<td>Basic free scanning<\/td>\n<td>Public scanner: 15,000 characters\/input<\/td>\n<td>Paid options available; distinguish characters from words<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/figure>\n\n\n\n<h2 id=\"ras-blocks-\" class=\"wp-block-heading\">1. Pangram: Best Overall for Teachers<\/h2>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1200\" height=\"633\" src=\"https:\/\/blog.tutorai.me\/wp-content\/uploads\/2026\/03\/pangram-homepage.jpg\" alt=\"Pangram homepage\" class=\"wp-image-509\" srcset=\"https:\/\/blog.tutorai.me\/wp-content\/uploads\/2026\/03\/pangram-homepage.jpg 1200w, https:\/\/blog.tutorai.me\/wp-content\/uploads\/2026\/03\/pangram-homepage-300x158.jpg 300w, https:\/\/blog.tutorai.me\/wp-content\/uploads\/2026\/03\/pangram-homepage-1024x540.jpg 1024w, https:\/\/blog.tutorai.me\/wp-content\/uploads\/2026\/03\/pangram-homepage-768x405.jpg 768w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">What we think makes <a href=\"https:\/\/affiliate.pangram.com\/b4m9mcquz0sa\">Pangram<\/a> the best tool overall for teachers is <strong>the detail the scans give you<\/strong>. Although you still get a \u201cpercentage\u201d score, the sentence-level highlights tell you more about exactly how AI was involved in producing something.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">You can see if a student just got a bit of AI assistance, rewrote something produced by an LLM, or churned out an entire essay with ChatGPT.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">We think that kind of insight gives teachers a way to have a helpful conversation with a student about where they need to do a little extra work, which is generally better than just immediately knocking everyone\u2019s grades down because they got a certain percentage on a scan.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Pangram has some brilliant research behind it, too. It managed a <strong>98.83% accuracy score<\/strong> on a test that looked at text passed through humanizer tools, and regularly earns accuracy scores of over 99% overall. Plus, its false positive rate is the lowest we have ever seen, <strong>only 1 in 10,000<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">On top of that, it integrates with most of the major LMS tools teachers use, has its own Chrome extension, works with Google Docs, and supports API access.<\/p>\n\n\n\n<h3 id=\"ras-blocks-\" class=\"wp-block-heading\">Pricing and limits<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The free plan is pretty limited, since you can only scan <strong>2,000 words and 3 images per day<\/strong>, but we do think the paid plans are still good value for money. The <strong>$20 per month<\/strong> Individual plan lets you scan 300,000 words and 100 images, and you can run plagiarism checks at the same time you search for AI.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The Professional plan (<strong>$65 per month<\/strong>) covers 1.5 million words, 500 images, and $200 in monthly API usage credits, and there\u2019s also an option to request zero data retention on that plan.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Pros<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Lowest false positive rate of any tool we have tried.<\/li>\n\n\n\n<li>Better at detecting humanized and hybrid text than other tools.<\/li>\n\n\n\n<li>Excellent independent review results.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Cons<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Very limited free plan compared to other tools.<\/li>\n\n\n\n<li>Better for longer pieces of content.<\/li>\n<\/ul>\n\n\n\n<h2 id=\"ras-blocks-\" class=\"wp-block-heading\">2. Copyleaks: Best for Classroom Integrations<\/h2>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"540\" src=\"http:\/\/blog.tutorai.me\/wp-content\/uploads\/2026\/04\/Copyleaks-Homepage-1024x540.jpg\" alt=\"\" class=\"wp-image-490\" srcset=\"https:\/\/blog.tutorai.me\/wp-content\/uploads\/2026\/04\/Copyleaks-Homepage-1024x540.jpg 1024w, https:\/\/blog.tutorai.me\/wp-content\/uploads\/2026\/04\/Copyleaks-Homepage-1024x540-300x158.jpg 300w, https:\/\/blog.tutorai.me\/wp-content\/uploads\/2026\/04\/Copyleaks-Homepage-1024x540-768x405.jpg 768w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Copyleaks is worth considering when your main problem is managing submissions across a class or department. Its Education offering connects with Canvas, Moodle, Blackboard, Brightspace, Google Classroom, and Schoology, helping you avoid a separate copy-and-paste routine.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It also combines AI detection and plagiarism checking in one report. <strong>These are different checks:<\/strong> AI detection estimates whether text resembles generated writing, while plagiarism checking looks for matching sources. Neither result should be read as a substitute for the other.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Multiple-file uploads are useful for reviewing a collection of essays. Support for more than 30 AI detection languages also makes Copyleaks relevant to multilingual courses, although language support doesn\u2019t establish equal accuracy across languages.<\/p>\n\n\n\n<h3 id=\"ras-blocks-\" class=\"wp-block-heading\">Pricing and limits<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Personal costs <strong>$16.99 per month<\/strong>, including 100 credits for up to 25,000 words. Annual billing works out at <strong>$13.99 per month<\/strong>; the annual allowance is listed as 1,200 credits for up to 300,000 words. That annual total isn\u2019t a monthly allocation.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Education access, including LMS and API arrangements, requires a custom quote. You\u2019ll need an Education quote to budget for classroom integration.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Pros<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Broad selection of classroom integrations.<\/li>\n\n\n<li>Combined reports and multiple-file uploads simplify review.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Cons<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Education pricing requires a separate purchasing conversation.<\/li>\n\n\n<li>Credit allowances need careful comparison across billing periods.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">For a solo teacher handling occasional essays, GPTZero is a simpler starting point. Copyleaks becomes more compelling when several teachers need a consistent submission workflow.<\/p>\n\n\n\n<h2 id=\"ras-blocks-\" class=\"wp-block-heading\">3. Turnitin: Best for Schools With Existing Access<\/h2>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"614\" src=\"http:\/\/blog.tutorai.me\/wp-content\/uploads\/2026\/03\/Turnitin-homepage-1024x614.jpg\" alt=\"\" class=\"wp-image-473\" srcset=\"https:\/\/blog.tutorai.me\/wp-content\/uploads\/2026\/03\/Turnitin-homepage-1024x614.jpg 1024w, https:\/\/blog.tutorai.me\/wp-content\/uploads\/2026\/03\/Turnitin-homepage-300x180.jpg 300w, https:\/\/blog.tutorai.me\/wp-content\/uploads\/2026\/03\/Turnitin-homepage-768x461.jpg 768w, https:\/\/blog.tutorai.me\/wp-content\/uploads\/2026\/03\/Turnitin-homepage.jpg 1200w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Turnitin is the sensible first stop if your institution already uses it and has enabled AI Writing Detection. Keeping review inside an approved school system can be more practical than asking teachers to upload essays to another service.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Existing Turnitin access doesn\u2019t automatically include AI detection, though. Your institution needs the appropriate license or add-on. Ask your administrator what\u2019s enabled before planning assignments around the feature.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The AI Writing Report covers qualifying long-form prose from <strong>300 to 30,000 words<\/strong>. That makes it relevant to essays, but not a reason to assume every short answer or submission format can be checked.<\/p>\n\n\n\n<h3 id=\"ras-blocks-\" class=\"wp-block-heading\">Reading the report<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Turnitin\u2019s AI percentage is separate from its similarity score. Results in the <strong>1% to 19% range appear as an asterisk<\/strong>, without a precise percentage or highlights. A 0% result is a distinct state, so don\u2019t treat the asterisk as another way of displaying zero.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Turnitin\u2019s guidance also says the report shouldn\u2019t be the sole basis for adverse action against a student. Build time for human review into your process.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Pricing:<\/strong> Institutional pricing is quoted. Individual submission credits do <strong>not<\/strong> include AI Writing Detection.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Pros<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Practical where approved institutional access is already available.<\/li>\n\n\n<li>AI and similarity results are available within the school\u2019s existing system.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Cons<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Not a straightforward standalone purchase for an individual teacher.<\/li>\n\n\n<li>AI detection may require an additional license.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">If your school has access, learn its report conventions and policy before paying for a second detector.<\/p>\n\n\n\n<h2 id=\"ras-blocks-\" class=\"wp-block-heading\">4. Originality.ai: Best for Bulk Checks<\/h2>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"546\" src=\"http:\/\/blog.tutorai.me\/wp-content\/uploads\/2026\/04\/Originality.ai-Homepage-1024x546.jpg\" alt=\"\" class=\"wp-image-489\" srcset=\"https:\/\/blog.tutorai.me\/wp-content\/uploads\/2026\/04\/Originality.ai-Homepage-1024x546.jpg 1024w, https:\/\/blog.tutorai.me\/wp-content\/uploads\/2026\/04\/Originality.ai-Homepage-1024x546-300x160.jpg 300w, https:\/\/blog.tutorai.me\/wp-content\/uploads\/2026\/04\/Originality.ai-Homepage-1024x546-768x410.jpg 768w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Originality.ai is a good fit when you have a stack of documents to review and want bulk scanning plus reports you can share or download. Its publisher and content-team focus makes it more of a document-processing option than an obvious first choice for an individual classroom.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Its credit system is worth a closer look, especially if you want plagiarism checks too.<\/p>\n\n\n\n<h3 id=\"ras-blocks-\" class=\"wp-block-heading\">Pricing and limits<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Pro costs <strong>$14.95 per month<\/strong>, or <strong>$12.95 per month billed annually<\/strong>, and includes 2,000 monthly credits. Limited free access is available.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">One credit covers 100 words for AI detection. Checking both AI and plagiarism uses two credits per 100 words. If you spend the full monthly allowance on one type of check, that means:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>200,000 words<\/strong> for AI-only scanning.<\/li>\n\n\n<li><strong>100,000 words<\/strong> for combined AI and plagiarism scanning.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Choose your allowance based on the checks you\u2019ll actually run.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Pros<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Bulk scanning suits larger document queues.<\/li>\n\n\n<li>Shareable and downloadable reports support record-keeping.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Cons<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Combined checks use credits twice as quickly as AI-only checks.<\/li>\n\n\n<li>Its content-team orientation may be less relevant to classroom needs.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Choose it for volume and reporting. If assignment-system integration matters more, begin with Copyleaks or your institution\u2019s Turnitin setup.<\/p>\n\n\n\n<h2 id=\"ras-blocks-\" class=\"wp-block-heading\">5. Scribbr: Best for Quick Checks Without an Account<\/h2>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"615\" src=\"http:\/\/blog.tutorai.me\/wp-content\/uploads\/2026\/04\/Scribbr-homepage-1024x615.jpg\" alt=\"Scribbr homepage\" class=\"wp-image-493\" srcset=\"https:\/\/blog.tutorai.me\/wp-content\/uploads\/2026\/04\/Scribbr-homepage-1024x615.jpg 1024w, https:\/\/blog.tutorai.me\/wp-content\/uploads\/2026\/04\/Scribbr-homepage-1024x615-300x180.jpg 300w, https:\/\/blog.tutorai.me\/wp-content\/uploads\/2026\/04\/Scribbr-homepage-1024x615-768x461.jpg 768w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Scribbr is the easiest recommendation here when you want to check a short essay without creating an account. Its free browser checker allows unlimited checks, with up to <strong>1,200 words per submission<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">That\u2019s convenient for an occasional classroom check or a student reviewing a short piece of work. There\u2019s no monthly word budget to calculate, although the submission limit still matters.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For a longer essay, splitting the text creates several separate results rather than one whole-document report. If you need to review the complete submission together, consider a tool or paid option that accepts its full length.<\/p>\n\n\n\n<h3 id=\"ras-blocks-\" class=\"wp-block-heading\">Pricing and limits<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The browser checker is free and requires no signup. Scribbr also offers paid premium document checking, with report support up to <strong>25,000 words<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Pros<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>No-account access keeps occasional checks straightforward.<\/li>\n\n\n<li>Unlimited free checks suit intermittent use.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Cons<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The 1,200-word cap restricts full-length essay checking.<\/li>\n\n\n<li>A free AI check doesn\u2019t answer whether sources were copied.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">For students, the result also won\u2019t guarantee agreement with a school\u2019s detector. Use it as information about that specific scan, not as a certificate to attach to an assignment.<\/p>\n\n\n\n<h2 id=\"ras-blocks-\" class=\"wp-block-heading\">6. QuillBot: Best for Explanations of Flagged Text<\/h2>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"538\" src=\"http:\/\/blog.tutorai.me\/wp-content\/uploads\/2025\/10\/QuillBot-Homepage-1-1024x538.jpg\" alt=\"QuillBot Homepage\" class=\"wp-image-363\" srcset=\"https:\/\/blog.tutorai.me\/wp-content\/uploads\/2025\/10\/QuillBot-Homepage-1-1024x538.jpg 1024w, https:\/\/blog.tutorai.me\/wp-content\/uploads\/2025\/10\/QuillBot-Homepage-1-300x158.jpg 300w, https:\/\/blog.tutorai.me\/wp-content\/uploads\/2025\/10\/QuillBot-Homepage-1-768x403.jpg 768w, https:\/\/blog.tutorai.me\/wp-content\/uploads\/2025\/10\/QuillBot-Homepage-1.jpg 1200w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">QuillBot stands out for its explainer cards, which describe why text was flagged. If a bare percentage leaves you unsure where to look next, that extra context can make the report easier to navigate.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For a teacher, the practical benefit is a more focused reread. You can examine the flagged wording and the explanation alongside the essay\u2019s argument, citations, and available drafts.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The cards explain the detector\u2019s judgment, so treat them as prompts for review rather than a list of phrases students should avoid.<\/p>\n\n\n\n<h3 id=\"ras-blocks-\" class=\"wp-block-heading\">Pricing and limits<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The free detector allows <strong>1,200 words per scan and six scans per day<\/strong>, with limited explainers. That can cover occasional use, but six scans won\u2019t accommodate a whole class in one sitting.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Premium costs <strong>$8.33 per month billed annually<\/strong>. It removes detector word and scan limits, expands the explainers, and provides a downloadable full report. That\u2019s useful for longer essays and keeping records.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">QuillBot\u2019s AI detector does <strong>not<\/strong> check plagiarism. That\u2019s a separate tool, so don\u2019t interpret an AI result as a source-matching check.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Pros<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Explainer cards add context to flagged text.<\/li>\n\n\n<li>Premium removes the detector\u2019s word and scan limits.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Cons<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Free daily capacity is restrictive for classroom batches.<\/li>\n\n\n<li>Full downloadable reports require Premium.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Choose QuillBot over a simpler scanner when explanations are what you need. Choose Scribbr if your priority is repeated short checks without an account.<\/p>\n\n\n\n<h2 id=\"ras-blocks-\" class=\"wp-block-heading\">7. Winston AI: Best for Scanned Essays and Reports<\/h2>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"615\" src=\"http:\/\/blog.tutorai.me\/wp-content\/uploads\/2026\/04\/winston-ai-homepage-1024x615.jpg\" alt=\"\" class=\"wp-image-492\" srcset=\"https:\/\/blog.tutorai.me\/wp-content\/uploads\/2026\/04\/winston-ai-homepage-1024x615.jpg 1024w, https:\/\/blog.tutorai.me\/wp-content\/uploads\/2026\/04\/winston-ai-homepage-1024x615-300x180.jpg 300w, https:\/\/blog.tutorai.me\/wp-content\/uploads\/2026\/04\/winston-ai-homepage-1024x615-768x461.jpg 768w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Winston AI is worth a look if your submissions include scanned pages or handwriting. It advertises optical character recognition, or OCR, alongside shareable PDF reports, addressing a different need from tools built mainly around pasted text.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">OCR converts the page into machine-readable text. Before interpreting a detection result, compare that extracted text with the original, especially where handwriting is unclear. Recognition errors can leave you reviewing something different from what the student submitted.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Shareable reports are useful when you need to retain a record of the check. Keep the original submission and your review notes alongside them.<\/p>\n\n\n\n<h3 id=\"ras-blocks-\" class=\"wp-block-heading\">Pricing and limits<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The <strong>14-day trial includes 2,000 credits<\/strong>. Confirm that the OCR and reporting features you need are accessible during the trial before subscribing.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Essential costs <strong>$18 per month<\/strong>, or <strong>$10 per month billed annually<\/strong>, with 100,000 credits per month.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Advanced costs <strong>$29 per month<\/strong>, or <strong>$16 per month billed annually<\/strong>, with 200,000 monthly credits, advanced plagiarism checking, and team access. Don\u2019t budget for Essential on the assumption that it includes Advanced\u2019s plagiarism features.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Pros<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>OCR is relevant to scanned and handwritten submissions.<\/li>\n\n\n<li>PDF reports support sharing and record-keeping.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Cons<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Extracted text needs checking against the original.<\/li>\n\n\n<li>Team access and advanced plagiarism features require Advanced.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">If your essays already arrive as editable text, OCR may not be a feature you need to pay for.<\/p>\n\n\n\n<h2 id=\"ras-blocks-\" class=\"wp-block-heading\">8. GPTZero: Best for Individual Teachers<\/h2>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"538\" src=\"http:\/\/blog.tutorai.me\/wp-content\/uploads\/2026\/04\/GPTZero-Homepage-1024x538.jpg\" alt=\"\" class=\"wp-image-488\" srcset=\"https:\/\/blog.tutorai.me\/wp-content\/uploads\/2026\/04\/GPTZero-Homepage-1024x538.jpg 1024w, https:\/\/blog.tutorai.me\/wp-content\/uploads\/2026\/04\/GPTZero-Homepage-1024x538-300x158.jpg 300w, https:\/\/blog.tutorai.me\/wp-content\/uploads\/2026\/04\/GPTZero-Homepage-1024x538-768x404.jpg 768w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">GPTZero offers a useful combination for teachers choosing their own tool: free access, sentence-level highlights, and features that help you look beyond the finished essay. That makes it a practical place to start if you\u2019re checking essays yourself.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The highlights help you locate passages to reread rather than leaving you with only a document-wide score. Google Docs Writing Replay adds another angle by letting you examine the writing process. That\u2019s useful when your next step is a conversation about how an argument developed.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Canvas and Google Classroom integrations are also offered, but availability depends on the plan. Don\u2019t assume a personal subscription includes the same classroom setup as an institutional package.<\/p>\n\n\n\n<h3 id=\"ras-blocks-\" class=\"wp-block-heading\">Pricing and limits<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The free allowance is <strong>10,000 words per month<\/strong>. Separately, the public homepage scanner shows a <strong>10,000-character input limit<\/strong>. The character limit determines how much you can paste at once.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Premium costs <strong>$12.99 per month billed annually<\/strong>, with 300,000 words per month and downloadable AI reports. The upgrade makes more sense for regular class-sized workloads than for checking a few short essays.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Pros<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Accessible starting point without a school-wide purchase.<\/li>\n\n\n<li>Passage highlights and writing-process tools support closer review.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Cons<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Free monthly capacity won\u2019t stretch far across several classes.<\/li>\n\n\n<li>Classroom integrations require checking plan eligibility.<\/li>\n<\/ul>\n\n\n\n<h2 id=\"ras-blocks-\" class=\"wp-block-heading\">9. ZeroGPT: A Simple Free Option<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">ZeroGPT offers a straightforward free scanner with sentence highlights. It\u2019s worth considering if you want a basic check and don\u2019t need the writing-process features GPTZero offers.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Despite their similar names, <strong>ZeroGPT and GPTZero are separate products<\/strong>. Check which service you\u2019re using before comparing allowances or choosing a subscription.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">ZeroGPT\u2019s public scanner accepts up to <strong>15,000 characters per input<\/strong>. That\u2019s not 15,000 words, so a longer essay may exceed the limit sooner than you expect.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The sentence highlights help you find passages to reread. Read those passages in context, including the paragraphs around them.<\/p>\n\n\n\n<h3 id=\"ras-blocks-\" class=\"wp-block-heading\">Pricing and limits<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A free option is available. ZeroGPT also offers paid personal, business\/education, and API options. Compare the paid packages if you need higher capacity or shared access.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Pros<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Free access for basic text checking.<\/li>\n\n\n<li>Sentence highlights provide more detail than a single overall result.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Cons<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The character-based input cap needs attention.<\/li>\n\n\n<li>Longer essays may need to be split to fit the free scanner.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">For more context, QuillBot offers explainers and GPTZero has writing-process tools. Those are more useful additions if your next step is discussing an essay with its author.<\/p>\n\n\n\n<h2 id=\"ras-blocks-\" class=\"wp-block-heading\">How to Choose an AI Detector for Essays<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Start with the task you need to complete, then compare plans.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Check school approval first.<\/strong> Before uploading student work, confirm your institution permits the service. Review its data-handling requirements, including what happens to uploaded essays and who can access reports.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Calculate a realistic workload.<\/strong> Thirty 1,500-word essays total 45,000 words before any rescans. A free allowance that works for occasional review may not cover one assignment cycle. Compare words, characters, and credits carefully.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Match the workflow.<\/strong> Individual teachers may value easy access and passage detail. Departments may need LMS integration, shared access, and consistent reporting. Scanned submissions introduce a separate OCR requirement.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Separate detection from source checking.<\/strong> An AI score estimates generated-text patterns. A plagiarism or similarity report identifies matching material that needs contextual review. You may need both, but they answer different questions.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Check language and document requirements.<\/strong> Make sure the service supports your essays\u2019 language, length, and format. Language support alone isn\u2019t evidence of equivalent performance across every classroom.<\/p>\n\n\n\n<h2 id=\"ras-blocks-\" class=\"wp-block-heading\">What to Do When an Essay Is Flagged<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Treat a flag as a reason to review the work, not as a finding.<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Read the complete essay.<\/strong> Examine the flagged passages in context and check citations against their sources.<\/li>\n\n\n<li><strong>Review available process evidence.<\/strong> Drafts, notes, outlines, and version history can help explain how the submission developed. Missing history isn\u2019t automatically suspicious.<\/li>\n\n\n<li><strong>Discuss the writing process.<\/strong> Ask the student how they chose sources, developed the argument, and revised specific passages. Give them room to explain.<\/li>\n\n\n<li><strong>Apply the assignment\u2019s rules.<\/strong> Distinguish prohibited generation from permitted brainstorming, editing, or other assistance.<\/li>\n\n\n<li><strong>Follow institutional procedure.<\/strong> Record the report, your observations, and the student\u2019s explanation before deciding whether further review is needed.<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">Running more detectors isn\u2019t a substitute for these steps. Several agreeing scores still don\u2019t establish authorship.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For future assignments, communicate expectations about drafts and AI-use disclosure in advance. That creates a clearer basis for discussion than introducing new documentation demands after a flag.<\/p>\n\n\n\n<h2 id=\"ras-blocks-\" class=\"wp-block-heading\">How We Compared These Tools<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">We tested each of these tools ourselves, running the same set of essays through every detector to see how the reports, highlights, and limits hold up in a real marking session. We also checked each product\u2019s current features, plan limits, and pricing, most recently in October 2026.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The order reflects what we found most useful in practice: <strong>how clearly a report shows where AI was involved, how low the false positive risk is<\/strong>, practical access for educators, essay-length limits, classroom workflows, reporting, and cost. Pangram leads because it combined the most detailed reports with the fewest false flags in our tests.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Accuracy results from different studies aren\u2019t directly comparable when samples, thresholds, and product versions differ, so we treat independent benchmarks as supporting evidence rather than the ranking itself. <strong>Our recommendations reflect how each tool performed for us and how well it fits a classroom<\/strong>, not a single measured accuracy score.<\/p>\n\n\n\n<h2 id=\"ras-blocks-\" class=\"wp-block-heading\">Which AI Essay Detector Should You Choose?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Choose <strong>Pangram<\/strong> for the clearest view of how AI was used in an essay, <strong>GPTZero<\/strong> for a free individual starting point, <strong>Copyleaks<\/strong> for integrated departmental workflows, or <strong>Turnitin<\/strong> when your school already has the required access.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For occasional short checks, <strong>Scribbr<\/strong> keeps things simple. Pick <strong>QuillBot<\/strong> for explanations, <strong>Originality.ai<\/strong> for bulk scanning, or <strong>Winston AI<\/strong> for scanned submissions. <strong>ZeroGPT<\/strong> covers basic free checking.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Before paying, confirm the tool solves your actual workload and fits your school\u2019s policy.<\/p>\n\n\n\n<h2 id=\"ras-blocks-\" class=\"wp-block-heading\">FAQs<\/h2>\n\n\n\n<h3 id=\"ras-blocks-\" class=\"wp-block-heading\">How accurate are AI detectors for essays?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">There isn\u2019t one accuracy figure that applies to every essay. Performance depends on the writing, document length, editing, and detector version. These tools can flag human writing or miss generated text, so use reports to guide review rather than settle authorship.<\/p>\n\n\n\n<h3 id=\"ras-blocks-\" class=\"wp-block-heading\">Why do two detectors give different scores?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Tools use different methods and thresholds, and their percentages may represent different things. Don\u2019t average the scores or treat agreement as independent confirmation. Read each report\u2019s explanation and return to the essay and writing process.<\/p>\n\n\n\n<h3 id=\"ras-blocks-\" class=\"wp-block-heading\">Can detectors assess essays that mix human and AI writing?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">They may flag passages, but a score can\u2019t reliably reconstruct who contributed what. For mixed work, review drafts, any AI-use disclosure, and the assignment\u2019s rules. The relevant question is whether the assistance used was permitted, not simply whether a detector found AI-like wording.<\/p>\n\n","protected":false},"excerpt":{"rendered":"<p>Pangram is our first choice for teachers, thanks to sentence-level highlights that show how AI was involved, the lowest false positive rate we have seen, and integrations with the major learning management systems. GPTZero\u2019s free monthly allowance still makes it a reasonable place for an individual teacher to start. For a department that wants checking [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[15],"tags":[],"class_list":["post-503","post","type-post","status-publish","format-standard","hentry","category-ai-detectors"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>9 Best AI Detectors for Essays: Features, Limits &amp; Prices<\/title>\n<meta name=\"description\" content=\"Compare the best AI detectors for essays, including Pangram, GPTZero, Copyleaks, and Turnitin. 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