Unfox is an AI content detector: paste text, get a verdict on whether a machine wrote it. A free check runs without creating an account, and paid plans start around $5, scaling into the low twenties for volume.
Now the part this directory owes you on every detector listing: AI detection is probabilistic and every detector produces false positives. That is not a knock on Unfox specifically; it is the physics of the category. Detectors have flagged the American Constitution as AI-written. Treat every verdict — from any tool — as a signal, never as proof, especially before accusing a student or a freelancer of anything.
What it costs
The no-account free check is the right first move, and not just for thrift — it is your calibration tool. Paid plans in the $5–23 range buy volume and batch checking, which mostly matters to editors and educators processing submissions at scale.
What we can’t tell you
Its actual false-positive rate. You can estimate it yourself in ten minutes: run five texts you personally wrote before 2022, and five fresh AI outputs, through the free check. The tool’s usefulness to you is precisely that score — and it costs nothing to obtain.
The details
| What it is | AI-authorship detector for text |
| Price | Free check, no account · paid plans ~$5–23/mo |
| Best for | Editors and educators triaging submissions — as a signal, not a verdict |
| Think twice if | You plan to act on single verdicts — no detector’s accuracy supports that |
