Remove AI Slop
Turn a stiff draft into clear, natural writing. Keep your meaning.
Free · paste and send. No account or key needed.
Or start with an example
how to use
Three steps
1 · Paste
Drop in your own text, or try one of the examples. No sign-up.
2 · Rewrite
The stiff, AI-sounding parts get reworded. What you meant stays put.
3 · Check
Compare it with what you wrote, then copy it if you are happy.
Does it still say the same thing?
Every rewrite is checked against your original: same claims, same numbers, same meaning. You see the check result with each answer, so you can tell whether it passed.
Before and after
benchmark
Numbers, in the open
We test patina on a fixed set of writing samples that anyone can open and check. It measures our own accuracy — it does not judge who wrote something.
- 100%
- overall accuracy 95% CI 92.7–100%
- 49
- writing samples samples labeled AI-like and natural
- 4
- languages KO · EN · ZH · JA
- 0
- natural writing wrongly flagged at a 1-in-100 false-alarm target, in 23 natural-labeled samples
| language | samples | accuracy | 95% confidence range | F1 score |
|---|---|---|---|---|
| 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 |
These numbers come from those 49 samples, and we use them to catch our own mistakes. They do not promise the same result on other kinds of writing, and they never say who wrote your text.
Read the full report →pricing
Simple pricing
Every plan rewrites your text the same way and runs the same checks. Paying only buys you more of it, and a way to plug patina into your own tools.
patina is for writing you are allowed to produce with AI help. It changes how something is worded — never what it claims, the numbers in it, or what causes what. It cannot tell you who wrote a text, and it is not built to slip past anything that tries to. Read our ethics policy.
Free
$0
- Browser playground
- 20 rewrites / day
- Up to 4,000 characters
- KO · EN · ZH · JA
Own key
Your own key
- Use a key you already have
- Up to 20,000 characters
- 120 requests/hour · 480/day
- The AI company bills you directly
Pro
$9.99/mo
- Connect patina to your own tools
- 100 rewrites / month
- Up to 20,000 characters each
- 50,000 characters / month total
The key from your purchase email is the only thing you need — paste it into Pro mode and your first rewrite checks it. We never save it. The monthly count and the monthly character total are separate limits, so either one can stop you first. The limits in place can differ from the ones listed here.
Paste your own and see
Put your own text in the box above and see what changes. Nothing to install, nothing to sign up for.