Stealth Writer vs Undetectable.ai
Head-to-head from the August 2026 cycle benchmark
Last tested
Sample size
33
Methodology
v1.2.0
Winner
69.83
overall
â–² 1
- Bypass
- 79.7
- Meaning
- 72.0
- Readability
- 43.7
61.49
overall
â–¼ 6
- Bypass
- 86.0
- Meaning
- 72.1
- Readability
- 55.2
Side-by-side metrics
Detector-level breakdown
Gold cell wins each row.
| Detector | Stealth Writer | Undetectable.ai |
|---|---|---|
| GPTZero | 30.8 | 86.6 |
| Winston AI | 88.2 | 87.5 |
| ZeroGPT | 88.6 | 89.8 |
| Copyleaks | 73.5 | 65.3 |
| Originality.ai | 43.7 | 66.1 |
Minimum monthly pricing
Stealth Writer
$20.00/mo
- Free tier
- Yes
Undetectable.ai
$19.00/mo
- Free tier
- Yes