Grammarly vs Stealth Writer
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
52.91
overall
â–² 1
- Bypass
- 0.0
- Meaning
- 94.3
- Readability
- 79.5
Side-by-side metrics
Detector-level breakdown
Gold cell wins each row.
| Detector | Grammarly | Stealth Writer |
|---|---|---|
| GPTZero | 1.9 | 30.8 |
| Winston AI | 0.1 | 88.2 |
| ZeroGPT | 13.7 | 88.6 |
| Copyleaks | 0.0 | 73.5 |
| Originality.ai | 0.0 | 43.7 |
Minimum monthly pricing
Grammarly
$30.00/mo
- Free tier
- Yes
Stealth Writer
$20.00/mo
- Free tier
- Yes