Stealth Writer vs Undetectable.ai
Head-to-head from the July 2026 cycle benchmark
Last tested
Sample size
33
Methodology
v1.2.0
Winner
72.17
overall
â–² 3
- Bypass
- 95.7
- Meaning
- 73.0
- Readability
- 55.9
68.07
overall
â–¼ 3
- Bypass
- 81.2
- Meaning
- 68.5
- Readability
- 44.5
Side-by-side metrics
Detector-level breakdown
Gold cell wins each row.
| Detector | Stealth Writer | Undetectable.ai |
|---|---|---|
| GPTZero | 36.5 | 94.1 |
| Winston AI | 89.4 | 90.9 |
| ZeroGPT | 89.5 | 90.4 |
| Copyleaks | 81.8 | 65.6 |
| Originality.ai | 46.0 | 66.5 |
Minimum monthly pricing
Stealth Writer
$20.00/mo
- Free tier
- Yes
Undetectable.ai
$19.00/mo
- Free tier
- Yes