GPTZero Alternative — Free, No Account
Free multi-signal AI detection without GPTZero's account requirement or free-tier usage caps.
Paste text & click Analyze, or try a sample
What aichecker.tech Does Differently#
GPTZero was one of the first AI detectors and pioneered the perplexity + burstiness approach. We extend that with three additional signals (sentence uniformity, formal transition frequency, vocabulary repetition) for a five-signal forensic analysis. Our methodology page documents each signal.
No Account, No Caps#
GPTZero’s free tier requires sign-up and limits monthly scans. aichecker.tech requires no account at all, with rate limits set at 5 requests per minute and 50 per day per IP — sufficient for almost any individual use case.
Detection Quality#
Both tools achieve high accuracy on unmodified AI text from the major models (ChatGPT, Claude, Gemini, Llama, Mistral). On our benchmark set, we report ~99.1% accuracy on unmodified output across these models. Where the two tools differ:
- GPTZero offers sentence-level highlighting in its UI (we surface signal-level breakdown but not per-sentence highlighting yet).
- GPTZero has a paid API tier with batch processing; ours is the same free API the web UI uses (documented at /api-docs).
- We publish our methodology and accuracy figures with honest limits; GPTZero discloses methodology in less detail.
When to Use GPTZero#
If you need per-sentence highlights or have already integrated GPTZero into a workflow, keep using it. If you want free, fast, account-less detection with published methodology, use us.
Combining Tools#
For high-stakes decisions, run text through multiple detectors and look for agreement. No single detector should be the sole basis for academic discipline or content removal.