Head to head · September 2026 cycle
AI Humanize io vs SupWriter
AI Humanize io finished 0.1 points ahead of SupWriter in the September 2026 cycle, 72.94 to 72.80, ranking #4 against #5 in a field of 14. AI Humanize io scored higher on 2 of 5 detectors and 5 of 7 writing categories. SupWriter came out ahead on Copyleaks (85.3 vs 60.6), discussion board prompts (78.0 vs 62.5) and penalties (None vs −1.0). The bypass-rate gap, 81.5 to 80.3, sits inside both tools' 95% confidence intervals, so treat bypass as a draw.
- Detectors
- 2 – 3
- Categories
- 5 – 2
- Components
- 3 – 2
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 →
CIs overlap marks a gap that sits inside both tools' published 95% confidence intervals for that component; it may not survive another cycle.
Detector by detector
Share of each tool's outputs that a detector classified as human-written. SupWriter took 3 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.
AI Humanize io
10 wins- Readability Score 58.4 vs 45.7
- Consistency Score 69.2 vs 64.7
- Bypass rate Score 81.5 vs 80.3
- GPTZero Detector 55.8 vs 21.0
- Originality.ai Detector 93.3 vs 78.5
- Business Email Category 46.2 vs 38.7
- Blog Post Category 80.9 vs 78.4
- Marketing Copy Category 82.4 vs 81.3
- Application Essay Category 68.0 vs 67.1
- Academic Essay Category 80.3 vs 79.7
SupWriter
7 wins- Penalties Score None vs −1.0
- Meaning preservation Score 79.0 vs 73.2
- Copyleaks Detector 85.3 vs 60.6
- ZeroGPT Detector 77.9 vs 75.0
- Winston AI Detector 81.5 vs 79.0
- Discussion Board Category 78.0 vs 62.5
- News Article Category 81.1 vs 71.8
Questions people ask
Is AI Humanize io better than SupWriter?
AI Humanize io finished 0.1 points ahead of SupWriter in the September 2026 cycle, 72.94 to 72.80, ranking #4 against #5 in a field of 14. AI Humanize io scored higher on 2 of 5 detectors and 5 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, AI Humanize io or SupWriter?
AI Humanize io posted the higher bypass rate, 81.5 vs 80.3, and scored higher on 2 of 5 detectors. AI Humanize io led on GPTZero and Originality.ai; SupWriter led on Copyleaks, Winston AI and ZeroGPT. The overall bypass gap is inside both 95% confidence intervals, so it is not a reliable difference.
Do AI Humanize io and SupWriter keep the original meaning?
SupWriter preserved meaning better, 79.0 vs 73.2 on our 0–100 similarity scale. On readability, AI Humanize io rated higher, 58.4 vs 45.7. Penalties this cycle: AI Humanize io −1.0, SupWriter None.