September 2026 review
AI humanizers tested
10 tools, each run on the same 50 English texts on its strongest advertised setting. Each profile carries the current-review numbers, the settings and plan tier used, the review-by-review history, and the tool’s own marketing claim set against what we measured.
| # | Humanizer | Pangram | GPTZero | Originality.ai | ZeroGPT | Winston AI | |||
|---|---|---|---|---|---|---|---|---|---|
| 1 | StealthGPTPassed all 5 detectors on 46 of 50 | 96.8% | 92% | 98% | 98% | 98% | 98% | 83.5% | 1.04 |
| 2 | WriteHumanPassed all 5 detectors on 32 of 49 | 92.7% | 65% | 100% | 98% | 100% | 100% | 58.7% | 1.02 |
| 3 | GrubbyPassed all 5 detectors on 18 of 50 | 85.6% | 36% | 94% | 98% | 100% | 100% | 77.5% | 1.11 |
| 4 | RephrasyPassed all 5 detectors on 20 of 50 | 84.0% | 46% | 88% | 86% | 100% | 100% | 54.5% | 1.13 |
| 5 | Undetectable.aiPassed all 5 detectors on 15 of 50 | 84.0% | 32% | 96% | 94% | 100% | 98% | 56.5% | 1.21 |
| 6 | RewriteAIPassed all 5 detectors on 13 of 50 | 77.2% | 28% | 86% | 88% | 88% | 96% | 72.0% | 1.09 |
| 7 | HIX BypassPassed all 5 detectors on 1 of 50 | 66.4% | 2% | 68% | 64% | 100% | 98% | 46.5% | 1.11 |
| 8 | HumbotPassed all 5 detectors on 0 of 50 | 66.4% | 0% | 62% | 70% | 100% | 100% | 47.5% | 1.12 |
| 9 | BypassGPTPassed all 5 detectors on 0 of 50 | 64.4% | 0% | 56% | 66% | 100% | 100% | 49.0% | 1.12 |
| 10 | RynePassed all 5 detectors on 0 of 50 | 23.6% | 22% | 8% | 0% | 62% | 26% | 79.0% | 1.07 |
Each column counts how many of the 50 texts that detector called human-written. Rank is the average of the five columns. WriteHuman returned 49 of 50 outputs, so its rates are out of 49. Full methodology.
Profiles
StealthGPT Super
Ranked 1 of 10 at 96.8% mean bypass. Pangram 92%, GPTZero 98%, Originality.ai 98%, ZeroGPT 98%, Winston AI 98%. Vendor claim checked against measurement.
WriteHuman
Ranked 2 of 10 at 92.7% mean bypass. Pangram 65%, GPTZero 100%, Originality.ai 98%, ZeroGPT 100%, Winston AI 100%. Vendor claim checked against measurement.
Grubby
Ranked 3 of 10 at 85.6% mean bypass. Pangram 36%, GPTZero 94%, Originality.ai 98%, ZeroGPT 100%, Winston AI 100%. Vendor claim checked against measurement.
Rephrasy
Ranked 4 of 10 at 84.0% mean bypass. Pangram 46%, GPTZero 88%, Originality.ai 86%, ZeroGPT 100%, Winston AI 100%. Vendor claim checked against measurement.
Undetectable.ai
Ranked 5 of 10 at 84.0% mean bypass. Pangram 32%, GPTZero 96%, Originality.ai 94%, ZeroGPT 100%, Winston AI 98%. Vendor claim checked against measurement.
RewriteAI
Ranked 6 of 10 at 77.2% mean bypass. Pangram 28%, GPTZero 86%, Originality.ai 88%, ZeroGPT 88%, Winston AI 96%. Vendor claim checked against measurement.
HIX Bypass
Ranked 7 of 10 at 66.4% mean bypass. Pangram 2%, GPTZero 68%, Originality.ai 64%, ZeroGPT 100%, Winston AI 98%. Vendor claim checked against measurement.
Humbot
Ranked 8 of 10 at 66.4% mean bypass. Pangram 0%, GPTZero 62%, Originality.ai 70%, ZeroGPT 100%, Winston AI 100%. Vendor claim checked against measurement.
BypassGPT
Ranked 9 of 10 at 64.4% mean bypass. Pangram 0%, GPTZero 56%, Originality.ai 66%, ZeroGPT 100%, Winston AI 100%. Vendor claim checked against measurement.
Ryne
Ranked 10 of 10 at 23.6% mean bypass. Pangram 22%, GPTZero 8%, Originality.ai 0%, ZeroGPT 62%, Winston AI 26%. Vendor claim checked against measurement.