July 12, 2026 · 5 min read
GPTZero Alternatives: Free AI Detectors Compared (2026)
Looking for a free GPTZero alternative to check text for AI writing? Here are the best options in 2026, compared — 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.