AI detector
Best GPTZero Alternative
GPTZero is one of the earliest and best-known AI detectors, launched in January 2023. It scores text using signals like perplexity and burstiness, and has grown into a full platform with teacher dashboards, writing reports, batch uploads, and a documented developer API. The free tier caps how much you can scan; paid plans raise those limits and unlock advanced features.
Why switch from GPTZero?
Check text instantly with no account: aicheckr scores up to 500 words without signup, while GPTZero pushes you toward registration and monthly word caps for full features.
Sentence-level probabilities on the free tier, so you can see exactly which lines drive the score instead of debating a single document verdict.
One toolkit instead of one tool: the same account covers an AI humanizer, paraphraser, citation verification, and a hallucination detector.
Flat, simple pricing: Pro is $10/month with unlimited checks (up to 5,000 words per scan) — no word-bank arithmetic.
GPTZero vs aicheckr: side by side
| Feature | GPTZero | aicheckr |
|---|---|---|
| Free tier | Yes, with monthly scan limits; account needed for most features | Yes — 500 words per check with no signup, 1,000 with a free account |
| Sentence-level analysis | Yes — highlights likely AI sentences | Yes — per-sentence AI probability plus an overall confidence band |
| Developer API | Yes — documented public API | No public API |
| Teacher dashboards & batch uploads | Yes — classroom reports and multi-file scanning | No — one paste-in check at a time |
| Plagiarism checking | Yes, on higher plans | No — AI detection only |
| Built-in humanizer & citation tools | No | Yes — humanizer, paraphraser, citation verification, hallucination detector |
| Pricing | Paid plans from roughly $10–15/month depending on billing | Free; Pro $10/month or $96/year |
Our verdict
GPTZero earns its reputation: if you need an API, batch uploads, or institution-style reporting, it is a strong product and worth paying for. If what you actually do is paste in an essay and decide whether to trust it, aicheckr gets you the same core answer — with sentence-level evidence — for free, and throws in the humanizer and citation tools GPTZero does not have.
Judge it on your own text
Paste up to 500 words — no account needed — and see per-sentence AI probabilities with a confidence band in seconds.
Try the free AI checker