AI Humanizer BenchmarkLeaderboard / Compare / Rephrasy vs Undetectable AI
Head to head · November 2026 cycle
Rephrasy vs Undetectable AI
On the November 2026 leaderboard, Rephrasy leads Undetectable AI 72.97 to 33.71, a gap of 39.26 points. Rephrasy ranks #3 and Undetectable AI ranks #10 out of 10 tools. Rephrasy scores higher on all 7 detectors and in all 7 writing categories. Undetectable AI is ahead on consistency (95.6 vs 80.7), meaning preservation (73.3 vs 69.6) and readability (76.5 vs 75.3).
- Detectors
- 7 – 0
- Categories
- 7 – 0
- Components
- 2 – 3
- Last tested
- Prompts
- 33
- Methodology
- v1.2.0
Score components
The overall score weights bypass rate at 42%, meaning preservation at 32%, readability at 16% and consistency across writing categories at 10%. Penalties for output-quality failures are then subtracted. Full scoring formula
Detector by detector
Each figure is one detector's average human-likelihood score across all of a tool's outputs, on a 0–100 scale. Higher means more human. Rephrasy scores higher on all 7 detectors.
Writing categories
Each category score applies the overall-score weights to that category's prompts only. Bypass, meaning preservation and readability are averaged within the category, and the tool's overall consistency score is added. Penalties are not subtracted. Categories with few prompts give less reliable scores, so each row shows its prompt count.
Where each one wins
Measures where one tool is ahead of the other. Ties are left out. Score components come first, then detectors, then categories, with the largest gap first in each group.
Rephrasy
16 wins- Bypass rate Score80.0 vs 3.5
- Penalties Score−3.0 vs −13.0
- Copyleaks Detector87.9 vs 0.0
- GPTZero Detector82.6 vs 3.0
- QuillBot Detector83.9 vs 12.7
- Grammarly Detector86.5 vs 27.1
- ZeroGPT Detector75.5 vs 46.5
- Originality.ai Detector28.1 vs 3.6
- Pangram Detector17.2 vs 0.0
- Discussion board Category84.7 vs 41.0
- Academic essay Category78.4 vs 39.3
- News article Category78.7 vs 46.3
- Marketing copy Category82.3 vs 51.0
- Blog post Category79.0 vs 52.7
- Business email Category70.2 vs 49.8
- Application essay Category61.4 vs 45.4
Undetectable AI
3 wins- Consistency Score95.6 vs 80.7
- Meaning preservation Score73.3 vs 69.6
- Readability Score76.5 vs 75.3
Questions people ask
Is Rephrasy better than Undetectable AI?
On the November 2026 leaderboard, Rephrasy has an overall score of 72.97 and Undetectable AI has 33.71, a gap of 39.26 points. Rephrasy ranks #3 and Undetectable AI ranks #10 out of 10 tools. Rephrasy scores higher on all 7 detectors and in all 7 writing categories. Both tools rewrote the same 33 prompts, the same 7 detectors checked every output, and scoring followed methodology v1.2.0. All inputs, outputs and detector verdicts are public.
Which bypasses AI detectors better, Rephrasy or Undetectable AI?
Rephrasy has the higher bypass rate, 80.0% vs 3.5% for Undetectable AI. It scores higher on all 7 detectors. The two tools' 95% confidence intervals for bypass rate do not overlap.
Do Rephrasy and Undetectable AI keep the original meaning?
Meaning preservation measures how close each output stays to its input, using embedding similarity on a 0–100 scale. Undetectable AI scores 73.3 and Rephrasy scores 69.6. On readability, Undetectable AI scores higher, 76.5 vs 75.3. This cycle, Rephrasy lost 3.0 points to penalties and Undetectable AI lost 13.0 points to penalties.