FREEAI Detector · no signup to start

Was this text written by AI?

Paste an essay, article, assignment or email and get an estimate of how likely it was written by AI — ChatGPT, GPT-4, GPT-5, Claude, Gemini or DeepSeek. Same detection model as the full TextSight app.

Free to startNo signupAI likelihood scoreNot stored when signed out
AI Detector
AI likelihood · estimate
0 / 1500 words
RESULT
IDLE

No text analyzed yet

Paste some text or load the example to estimate AI likelihood.

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WHAT WE ANALYZE

The signals of AI-written text

Phrasing & predictability

AI writing leans on predictable word choices and smooth, low-surprise phrasing that reads evenly across a whole passage.

Sentence rhythm

Human writing varies in cadence and length. Uniform sentence rhythm and balanced structure are common signals of generated text.

Per-sentence highlights PRO

The free check returns an overall AI likelihood score; Pro and the app add per-sentence highlighting, exportable reports and unlimited daily scans.

HOW IT WORKS

Check any text in three steps

1

Paste your text

Drop in an essay, article, assignment, report or email. No sign-up needed to run your first checks.

2

Run the detector

Your text is analyzed with the same model as the full TextSight app for AI-generation signals.

3

Read the estimate

You get an overall AI likelihood score and a plain-language verdict you can use as a prompt for review.

Verify authenticity at scale?

Open the full Detector in the app for per-sentence highlights, exportable reports, bulk scanning and unlimited daily scans.

Open the full Detector
FAQ

AI detector questions

How does the AI detector work?
It runs your text through the same detection model as the full TextSight app, weighing linguistic signals that correlate with AI-generated writing — phrasing patterns, predictability, sentence rhythm and word choice — to estimate an overall AI likelihood score.
Which AI models can it detect?
It estimates AI likelihood for text from ChatGPT, GPT-4, GPT-5, Claude, Gemini, DeepSeek and other large language models. The signals are model-agnostic, so newer models still produce a useful estimate.
How accurate is it?
No AI detector is 100% accurate. Short, heavily edited or mixed human-and-AI passages are inherently ambiguous. Treat the score as an estimate of AI likelihood and a prompt for review — not as proof of authorship.
How much can I check for free?
You can start with no sign-up. A free account raises your daily checks and word limit, and Pro adds unlimited daily scans, per-sentence highlighting, exportable reports and bulk scanning.
Is my text stored?
Not signed in? Your text is deleted right after the scan and never stored. Signed in, your scans save to your private history (deletable anytime). We never use your text for training.
Does it work on mobile?
Yes — the editor and results stack cleanly on phones.