AI Detector
Check if text was written by AI. Analyze sentence variance and burstiness to estimate the likelihood of AI generation.
Enter text above for heuristic analysis
Heuristic: burstiness = std dev of sentence lengths; variance = mean squared deviation of sentence lengths; repetition score = 1 − (unique words / total words); perplexity proxy via uncommon word ratio (words outside top-100 common list). Weighted likelihood ≈ 0.3×burstiness + 0.2×variance + 0.2×repetition + 0.3×perplexity; short texts pulled toward 50% (uncertain).
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About the author
Written and maintained by the Tool4SaaS team. Every tool runs locally in your browser and is tested in-house for accuracy. Last updated: .
Frequently asked questions
Heuristic only ~70% — checks burstiness, variance and uncommon words. Not for academic decisions.
Yes, burstiness and variance scoring run locally; your draft is never sent for analysis.
Yes, it is free, works offline in your browser, and your data never leaves your device.
How to use AI Detector
- Paste text: Paste text to check.
- View score: See AI likelihood % with bar.
- Interpret: High burstiness and low variance suggest AI.