September 14, 2026 · 4 min read
QuillBot AI Detector Alternatives (Free, No Sign-Up)
QuillBot's AI detector caps free checks. Here are the best free alternatives in 2026 for checking whether text reads as AI-written — compared side by side.
QuillBot's AI detector is handy if you already use its paraphraser, but the free version limits how many words you can check, and longer scans nudge you toward an account. If you just need a quick, private check, these are the alternatives worth knowing.
The options
| Tool | Account needed | Upload Word/PDF | Where it runs |
|---|---|---|---|
| Skrubly | No | Yes | In your browser |
| QuillBot | For longer checks | Limited | Server |
| ZeroGPT | No | Yes | Server |
| GPTZero | Yes | Yes | Server |
Paste your text or drop a file — free, no account.
Open the AI Content DetectorWorth knowing
If you've run text through a paraphraser, detectors can still flag it — rewording tools tend to produce the same smooth, even patterns detectors react to. The most reliable fix is adding your own specifics and varying your sentence rhythm.