12 July 2026 · 5 min read
GPTZero Alternatives: Free AI Detectors Compared (2026)
Free GPTZero alternatives in 2026 for checking text for AI writing, compared side by side, including one that runs entirely in your browser.
GPTZero is one of the best-known AI writing detectors, but the free tier limits how much you can scan and asks you to sign up. If you want a free GPTZero alternative to quickly check whether text reads as AI-written — no account, no word cap — Skrubly's AI Content Detector runs entirely in your browser and highlights the most AI-like passages. Here's how the main options compare.
Free AI detectors compared
| Tool | Free | Sign-up | Word limit | Highlights AI passages | Runs in browser |
|---|---|---|---|---|---|
| Skrubly | Yes | No | Generous | Yes | Yes |
| GPTZero | Limited | Yes | Capped on free | Yes | No (server) |
| Copyleaks | Limited | Yes | Capped on free | Yes | No (server) |
| ZeroGPT | Yes | No | Some limits | Basic | No (server) |
How to check your text for free
- Open Skrubly's AI Content Detector.
- Paste your text, or upload a Word/PDF file.
- You get an instant estimate of how AI-written it reads, with the most AI-like passages highlighted so you can revise them.
Check your text now — free, no sign-up.
Open the AI Content DetectorAn honest word on accuracy
No AI detector — GPTZero, Copyleaks, or any other — is 100% accurate. They all work on probability and can produce false positives on clear, formulaic writing. Treat the score as a signal to review your work, not as proof. The best use is to check your own writing before you submit and smooth out the parts that read like a machine.