Skip to content

AI Detector for Teachers

Free

Check if student submissions are AI-generated

Text to Analyze 0 words

Free to use · Ctrl+Enter to submit

Results

Detection results appear here

Paste at least 30 words and click Analyze Text to check for AI patterns

Before you use this to raise a case

On our published benchmark this detector flagged 1 of 24 human-written samples as AI — a 4% false positive rate. It reads writing style, and some people write in a style it mistakes for a machine: non-native English speakers, writers of formal academic prose, and anyone taught to write in a plain, uniform register. A high score is a reason to open a conversation about a draft, never on its own a finding of misconduct.

It is also wrong in the other direction far more often: it misses most AI text that has been asked not to sound like AI. A low score does not clear a submission. See the full error rates and how we measured them, or send the student what a score does and does not prove.

Academic integrity is under pressure as students increasingly submit AI-generated work. Teachers need practical tools to review AI-written essays, reports, and assignments without spending hours manually analyzing each submission. But many detectors are expensive, opaque, or aimed at institutional buyers rather than day-to-day classroom use.

Coda One's AI Detector for Teachers starts directly in the browser, so you can review a submission without waiting on account setup or institution-level onboarding. Paste any student submission to get an overall AI probability score, per-sentence breakdown with color-coded highlighting, and pattern analysis showing which writing characteristics influenced the result. The multi-model approach (statistical, pattern, and ensemble) is meant to give a broader view than a single-score detector.

The per-sentence analysis is particularly valuable for educators. Instead of a simple "AI or not" verdict, you can see which specific sentences show AI patterns and which appear genuinely human-written. This helps you have informed conversations with students about their work rather than making blanket accusations based on a single score.

Frequently Asked Questions

How should teachers read the results?
Use the detector as one signal, not a final verdict. The per-sentence analysis can help highlight sections that deserve a closer look, but you should still weigh the student's writing history, drafts, and assignment context before drawing conclusions.
Can students beat this detector with AI humanizers?
Yes, easily, and we publish the measurement rather than claim otherwise. On our own benchmark we missed 23 of 24 AI samples at the default threshold — a 95.8% false negative rate — including all three samples produced by our own AI Humanizer. Treat a low score as no evidence at all, not as evidence of human authorship. The full benchmark is at /ai-detector/accuracy.
Is it free for student submissions?
Yes. The detector is free with no daily limit and no signup. The submitted text is sent to our API over HTTPS to be scored; used anonymously it is not stored after the result is returned. If you are signed in, the text and result are saved to your own tool history.
How should I use AI detection results with students?
Use detection results as a conversation starter, not as proof of cheating. If a submission scores high, discuss it with the student. Ask them to explain their writing process, provide drafts, or answer questions about their content. High AI scores are an indicator, not a conviction.
Can I check papers in languages other than English?
The detector is optimized for English text and is most useful on English submissions. It may work with other Latin-script languages, but results can be less consistent there.

Also Available For

Students Academic Writing Businesses

Open the full detector

More AI Tools: AI Humanizer ·AI Rewriter ·Grammar Checker