Free AI writing detector
ScribeLens marks every sentence, names the pattern behind each flag, and shows where the evidence sits in your document, so you can review it and make the call.
Your text is analysed in memory and never stored, unless you choose to create a verification link.
One score tells you how much. Sentence evidence tells you where. ScribeLens works sentence by sentence and keeps the evidence in front of you.
Academic writing is formal, structured and full of citations, and that alone shouldn't make it look AI-written. Before scoring, ScribeLens sets aside reference lists, citations, DOI and ISSN lines, publisher boilerplate and declaration sections such as funding and author contributions.
Start with evidence, not an accusation.
See which sentences were flagged and why, then use the report alongside drafts, revision history and a conversation with the student.
Check your writing before you submit.
See which parts of your draft may read as AI-like and why, and make your writing clearer and more specific.
Scan papers without preparing them first.
Long academic documents are analysed in one pass, with references, citations and publishing boilerplate set aside automatically.
Screen submissions with evidence you can share.
Move from a single percentage to specific passages and reasons, in a report you can attach to the editorial record.
Review drafts from writers and freelancers before they're published, and share a clear report with the author.
Teams collecting human-written text for AI training can screen submissions through the API, with sentence-level evidence for every document.
Export the analysis as PDF or DOCX, or create a verification link so others can open the same result. Share the evidence and keep the decision with people.
Short answers to what people ask most. See all questions →
Every scan classifies each sentence as human-like, mixed, or AI-like, highlights it in your document, and names the pattern behind every flag with reason keywords. You can export the whole report as PDF or DOCX.
Run an analysis on the Detector page, then use the "View full report" button in the result banner. The report stays available until you clear or replace the analysis.
No detector is, and any tool claiming 99.9% deserves scepticism. We show our reasoning sentence by sentence, so you can check us.
Text written with ChatGPT, Claude, Gemini and similar assistants. ScribeLens detects the patterns language models share, so a result tells you whether a passage shows AI-like patterns, not which tool produced it.
Yes — as evidence inside your process, which is exactly what the sentence-level view is built for: a report you can point to, with the flagged sentences and the reason named for each. It is never the whole case on its own. Pair it with revision history and a conversation with the student, the way any evidence in a fair process gets weighed.
English. The detection models and the pattern checks behind every sentence flag are built and calibrated on English writing, so results on other languages are not reliable — we would rather say so than hand you a confident-looking score. Text in any language is accepted, but only English text gets a meaningful report today.
Your analysis is kept in your own browser session so a refresh does not lose it, and it is cleared when the tab closes. A copy is only stored on our side if you explicitly create a verification link, and those expire automatically after 180 days.
Yes. The ScribeLens AI Detector extension for Chrome checks text without leaving the page. Select text on any web page and right-click "Check with ScribeLens": a side panel shows the overall result, the share of human, mixed and AI-like sentences, and the sentences most worth a look, with the reason for each. Up to 2,000 words are checked in the panel, with the same limits and privacy as the website. Longer text opens on scribelensai.com, where a free account checks the whole document, and "View full report" opens the complete report there without checking the text again.
ScribeLens shows where the signals are and why, so your decision rests on evidence, not a single number.