Check your essay, paper or draft for AI-written text in seconds. This free AI detector is built for students, teachers and colleges: paste your text or upload a file and get an AI-probability score with sentence-level highlights. Free users can scan up to 700 words, with a 50-word minimum. Results are estimates, not proof, so read them alongside your drafts and our guide to AI detection score.
Drop in your essay, paper, or draft as text or a file. No formatting cleanup needed.
Our engine checks every sentence against known AI writing patterns and cross-references originality across 100+ languages.
See a clear AI-probability score, sentence-by-sentence highlights, and a plagiarism breakdown side by side.
Export a clean PDF report you can submit, save, or forward to a teacher or supervisor.
Detect AI-generated content in essays with our advanced AI detector for students and teachers. Get fast, accurate results to ensure originality, academic integrity, and fair evaluation.
See which passages look AI-written, not just one overall number.
An AI-probability score you can read next to your drafts.
Check both AI and matching text in one report.
Download a clean report to save or share with a teacher.
Your documents are never sold, shared or used to train our detection models.
Tuned for essays, papers and reports in 20+ languages, for students and teachers alike.
Check a draft before you submit so you can see which passages may read as AI-written, then revise in your own words. Keep your drafts, notes and version history, because they show how you wrote the work.
If your score comes back higher than expected, read what to do if your AI detection score is high.
Use the report as one signal, not a verdict. Compare the writing with the student's earlier work, look at their drafts and talk with them before deciding anything.
See how professors detect AI and whether discussion boards can detect AI writing.
Institutions use detectors as a first screening step, and many limit how scores are used in misconduct cases.
See what universities say about AI detection. For institutional reports and API access, use the partnership option below.
An AI detection score is an estimate of how likely text is to be AI-written, not proof. As a general guide, scores up to about 20% rarely cause problems, 21-35% may lead to questions and above 35% often prompts a review.
Different tools report scores differently, so the same essay can score differently elsewhere. See what common scores mean and what percentage of AI is acceptable.
A score is a reason to look closer, not proof of misconduct. Keep your drafts, notes and version history so you can show how you wrote the work.
| Skyline Academic | Turnitin | GPTZero | Originality.ai | Copyleaks | QuillBot | Scribbr | |
|---|---|---|---|---|---|---|---|
| Built for | Individual students & teachers | Institutions only | Individual writers | Publishers & agencies | Enterprise / business | Individual writers | Students |
| Access without an institution | Yes | No | Yes | Yes (paid) | Yes (paid) | Yes (paid) | Yes |
| AI + plagiarism in one scan | Yes | Plagiarism-first, AI add-on | AI only | AI-focused | Yes | AI only | Separate tools |
| Pricing | Pay-per-scan from $5.99 | Institutional license only | Free + paid tiers | Subscription | Subscription | Subscription | Free + paid tiers |
| Free daily scan | Yes, up to 700 words | No | Limited | No | No | Limited | Limited |
| Languages supported | 20+ | Varies by plan | English-focused | English-focused | Multiple | English-focused | Multiple |
| Report format | Exportable PDF | Institutional dashboard | On-screen only | Dashboard | Dashboard | On-screen only | On-screen only |
| Learn more | You are here | How Turnitin's AI detection works | GPTZero alternatives | Is Originality.ai accurate? | Is Copyleaks accurate? | Is QuillBot accurate? | Is Scribbr accurate? |
Last checked Oct 2026. Competitor details come from each company's published information.
93k+ AI checks completed with near-perfect accuracy — trusted globally by students and educators.
AI Checks
Detection Precision
Satisfied Students & Educators
No AI detector is perfect. Here is how ours performed against seven other tools on the same set of documents, and exactly how we ran the test.
When: October 2026
Documents: 126 in total, 63 written by humans and 63 generated by AI tools
Sources: Human texts were 40 student essays shared with permission and 23 public-domain articles. AI texts were 63 essays generated with ChatGPT (GPT-4o), Claude and Gemini on the same prompts, 21 per tool, with 20 of them lightly edited by hand.
Settings: Each detector was run on its default settings, using the version available in October 2026, with the full document pasted as plain text.
How accuracy is measured: The share of the 126 documents each detector classified correctly.
Results vary by text type, length and language. A single test is a snapshot, not a guarantee, and no detector should be the only basis for a decision about a student.
| Detector | Accuracy | Correct | Incorrect |
|---|---|---|---|
| Turnitin | 98 | 2 | |
| Skyline Academic | 97 | 3 | |
| Originality.ai | 90 | 10 | |
| Scribbr | 78 | 22 | |
| ZeroGPT | 75 | 25 | |
| Grammarly | 64 | 36 | |
| CrossPlag | 60 | 40 | |
| IvyPanda | 56 | 44 |
Figures are counts of documents out of 126. Tested October 2026; tools change often, so results may differ today. Read more about AI detection false positives and how every AI plagiarism checker compared.
Detects text generated by leading LLMs like GPT-4, ChatGPT, Claude, Gemini, and LLaMA for reliable authenticity checks.
Offers clear, probability-driven AI scores so you can easily see how authentic your writing appears and identify areas that may need revision.
Everything is checked in one scan. You save time while ensuring your work is both original and authentically written.
Delivers clean, exportable PDF reports with detailed insights perfect for teachers, institutions, and researchers who need transparent documentation.
Frequently updated to stay ahead of new AI writing tools, ensuring accurate and reliable detection as technology continues to evolve.
Free: scan up to 700 words. Paid scans are per document, with no subscription.
*Prices are per check, not a subscription
*Prices are per check, not a subscription
*Prices are per check, not a subscription
Verify that your manuscripts are human-authored before journal submission.
Ensure academic integrity in your thesis or coursework.
Validate reports and business writing for authenticity.
Protect your business from copyright issues and ensure all marketing materials and documents are 100% original.
Ensure your blogs and papers are original.
Educational institutions can confidently verify originality, ensuring assignments, research papers, and assessments reflect genuine student work.
Researchers and supervisors can validate the authenticity of manuscripts, literature reviews, and data-driven writing.
Teachers receive clear, evidence based insights that reduce bias and help maintain consistent grading across classes, subjects, and writing levels.
Supporting 20+ global languages including English, Arabic, French, and Spanish — designed for diverse academic needs.
Empower your institution or platform with Skyline Academic’s advanced AI content detection API and partnership programs.
We know you're uploading unpublished academic work, so we treat it that way.
Scan with confidence. Your originality check stays between you and Skyline.
Get comprehensive originality insights.
Generate compliance-friendly reports.
Designed for reliable classroom and publishing use.
Real reviews from people using Skyline Academic as a free AI detector for essays, an AI checker for students and an AI detection tool for academic writing.
How our free AI detector works, what it costs, what your score means and how we handle your text.
Our free AI detector checks text for patterns common in AI-written writing and returns an AI-probability score with sentence-level highlights. Paste or upload your essay, click Check and review the report. Free users can scan up to 700 words, with a 50-word minimum. Results are estimates, not proof.
Yes. Students can check a draft before submitting to see which passages may look AI-written. Treat the result as one signal and keep your drafts and notes as evidence of your process.
Yes, as a first screening step. A score should never be the only basis for a decision. Compare the work with the student's earlier writing, look at drafts and talk with the student first.
Essays, papers, reports and other written text, pasted or uploaded as a file [list the file formats you support]. Text under 50 words can't be scanned.
[Confirm: you can scan up to 700 words for free, with or without an account.] Sign up for full access, including longer documents and reports.
Free users can scan up to 700 words. Longer documents and combined AI and plagiarism reports are paid per scan: $5.99 for up to 3,500 words, $12.99 for 3,501-15,000 and $19.00 for 15,000+ words. There is no subscription.
It combines AI and plagiarism checks in one scan, shows sentence-level highlights, exports a PDF report and keeps your text private. No detector is perfect, so use the result alongside your drafts.
In our test of [126] documents, it classified [97%] correctly. See our method above. No detector is perfect, and results can be wrong on short, formal or non-native writing.
It estimates how likely text is to be AI-written. Low scores rarely cause problems and high scores prompt a closer look, not a verdict. See our guide to AI detection score meaning.
There is no universal figure. Each university and instructor sets its own rules. See our guide to what percentage of AI is acceptable.
It is built to detect text from major tools such as ChatGPT, Claude, Gemini and LLaMA. No detector reliably catches every model or heavily edited AI text.
Your documents are never sold, shared or used to train our detection models. Files are encrypted in transit and deleted from our systems after your scan window closes, and only you can access your reports.
Yes, it supports [20+] languages including English, Spanish, French and German. Accuracy can vary by language.
Once signed up, users get a dedicated portal where they can manage their AI detector usage, place orders, track submissions, and review results efficiently.
We follow a clear return policy. If a service does not meet the agreed requirements, users can contact our support team for review according to our refund terms.
Yes, we offer a 20% discount for users. This makes our AI detector for students and teachers more affordable while maintaining accuracy and reliability.
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