Head to head · September 2026 cycle
Penlify vs StealthBypass
StealthBypass finished 2.8 points ahead of Penlify in the September 2026 cycle, 39.38 to 36.57, ranking #13 against #14 in a field of 14. StealthBypass scored higher on 5 of 5 detectors and 2 of 7 writing categories. Penlify came out ahead on penalties (−5.0 vs −23.0), meaning preservation (62.7 vs 39.5) and marketing copy prompts (38.8 vs 18.9).
- Detectors
- 0 – 5
- Categories
- 5 – 2
- Components
- 4 – 1
Score components
What the overall score is made of: bypass rate weighs 42%, meaning preservation 32%, readability 16%, consistency across categories 10%. Output-quality penalties come off the total. How scoring works →
Detector by detector
Share of each tool's outputs that a detector classified as human-written. StealthBypass took 5 of 5.
Writing categories
Category score per writing context: bypass credit only for real rewrites, blended with the category's own meaning preservation and readability. Small categories swing; the prompt count is shown on each row. How category scores work →
Where each one wins
Every measure above that one tool won outright, largest margin first within each group.
Penlify
9 wins- Penalties Score −5.0 vs −23.0
- Meaning preservation Score 62.7 vs 39.5
- Consistency Score 100.0 vs 80.7
- Readability Score 71.8 vs 54.1
- Marketing Copy Category 38.8 vs 18.9
- Business Email Category 39.9 vs 26.0
- Application Essay Category 35.9 vs 24.5
- Blog Post Category 37.3 vs 28.2
- News Article Category 36.6 vs 35.3
StealthBypass
8 wins- Bypass rate Score 78.6 vs 0.0
- GPTZero Detector 69.3 vs 0.0
- Copyleaks Detector 65.1 vs 0.0
- Originality.ai Detector 58.5 vs 0.0
- Winston AI Detector 56.3 vs 0.4
- ZeroGPT Detector 84.4 vs 43.0
- Academic Essay Category 39.9 vs 27.0
- Discussion Board Category 42.8 vs 32.1
Questions people ask
Is Penlify better than StealthBypass?
StealthBypass finished 2.8 points ahead of Penlify in the September 2026 cycle, 39.38 to 36.57, ranking #13 against #14 in a field of 14. StealthBypass scored higher on 5 of 5 detectors and 2 of 7 writing categories. Both tools ran the same 33 prompts, scored by the same 5 detectors, under methodology v1.2.0; every input, output and verdict is published.
Which bypasses AI detectors better, Penlify or StealthBypass?
StealthBypass posted the higher bypass rate, 78.6 vs 0.0, and scored higher on 5 of 5 detectors. StealthBypass led on GPTZero, Originality.ai, Copyleaks, Winston AI and ZeroGPT.
Do Penlify and StealthBypass keep the original meaning?
Penlify preserved meaning better, 62.7 vs 39.5 on our 0–100 similarity scale. On readability, Penlify rated higher, 71.8 vs 54.1. Penalties this cycle: Penlify −5.0, StealthBypass −23.0.