Make it sound human
Paste AI-sounding text — patina rewrites it naturally. KO·EN·ZH·JA.
how to use
Three steps
1 · Paste
Drop in your AI-sounding draft. No code, no key.
2 · Rewrite
patina clears ~160 patterns and rewrites it naturally.
3 · Verify
Check MPS, fidelity, and the AI signal (before → after).
samples
Before and after
benchmark
Numbers, in the open
A deterministic suspect-zone benchmark on a checked-in fixture corpus — auditable, not an authorship test.
- 100%
- overall accuracy 95% CI 92.7–100%
- 49
- fixtures AI vs. natural, labeled
- 4
- languages KO · EN · ZH · JA
- 0
- false positives at the 1% FPR budget
burstiness
MATTR
AI-lexicon
KO diagnostics
| lang | fixtures | accuracy | 95% CI | F1 |
|---|---|---|---|---|
| EN | 13 | 100% | 77.2–100% | 1.00 |
| JA | 12 | 100% | 75.8–100% | 1.00 |
| KO | 12 | 100% | 75.8–100% | 1.00 |
| ZH | 12 | 100% | 75.8–100% | 1.00 |
Measured on 49 deterministic fixtures as a regression gate — not a claim of generalization to new models, genres, or edited AI text, and not an authorship verdict.
Read the full report →Paste your own and see
Drop an AI-sounding draft into the box above. No code, no key.