Check up to 700 words free, with or without an account. Paste your text or upload a file in any format, and see your AI percentage with sentence-level highlights. 98.7% precision in our internal testing.
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. Check up to 700 words free, with or without an account, with a 50-word minimum. To understand your result, see our guide to AI detection score meaning. Results are an estimate, not proof, so use the highlighted sentences to decide what to review.
Paste your text or upload a file in any format. Free checks cover 50 to 700 words, with or without an account.
Our engine checks every sentence against known AI writing patterns and cross-references originality across more than 20 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. Our detector achieved 98.7% precision in our internal testing: when it flags text as AI-generated, it is right 98.7% of the time.
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.
College papers are longer and more formal than school essays, which is where AI detectors are more likely to over-flag. Upload your paper in any file format, check up to 700 words free, and use the sentence-level highlights to see which passages read as AI-written before you submit.
For full research papers, theses and dissertations, a paid scan checks the whole document in one go, including documents of 15,000 words or more, with AI and plagiarism results in the same report. Instructors can use the exported PDF as one piece of evidence, never as the only basis for a decision.
Rarely causes problems. Check any highlighted sentences, such as quotes or common phrases.
May lead to questions. Review the highlighted passages and keep your drafts and notes.
Often prompts a review. Revise flagged parts in your own words and keep evidence of your writing process.
General guidance only. Your university or instructor sets the actual rules, and a score is a reason to look closer, not proof of misconduct.
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 98.7% precision in our internal testing.
AI Checks
Detection precision
Satisfied Students & Educators
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. 98.7% precision in our internal testing.
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.
Check up to 700 words free, with or without an account. Pay per scan for longer documents, no subscription.
*Prices are per check, not a subscription
*Prices are per check, not a subscription
*Prices are per check, not a subscription
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 more than 20 languages, including English, Spanish, French and German, 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 checker works, what it costs, what your score means and how we handle your text.
Yes. You can check up to 700 words for free, with or without an account. For longer documents, pay-per-scan options start at $5.99 with no subscription.
No. You can paste or upload up to 700 words and run a free check without creating an account. You only need an account to buy a paid scan for a longer document.
Our detector achieved 98.7% precision in our internal testing, which means that when it flagged text as AI-generated, it was correct 98.7% of the time. No AI detector is perfect, and very short or heavily edited texts are harder to judge, so treat any score as a signal rather than proof.
You can upload documents in any file format or paste your text directly. Each check needs at least 50 words, and free checks cover up to 700 words.
The score is an estimate of how likely your text is to be AI-generated, with the sentences behind it highlighted. It is not proof that AI was used, and it should be read alongside your drafts and writing process.
There is no universal number, because each university and instructor sets its own rules. As general guidance, scores up to 20% rarely cause problems, while higher scores are more likely to lead to questions or a review.
Yes. The detector is designed to recognise text written by large language models, including ChatGPT, Claude and Gemini. Heavily edited or paraphrased AI text is harder for any detector to identify.
Yes. The report can show AI detection and plagiarism results from one scan, so you can review both before you submit.
No. Your documents are never sold, shared or used to train our detection models.
Yes. It supports more than 20 languages, including English, Spanish, French and German. Accuracy can vary by language.
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