Humanizer Checker
Paste in some writing and Optimal will check if it was run through an AI "humanizer." Humanizers are tools that rewrite AI writing so AI detectors won't catch it, and a lot of students have started using them.
Just so you know, Optimal is made to catch humanized text, but it also gives a higher score to writing that reads like AI, since most humanized text still does underneath. Some human writing that sounds very generic can score high too, so a high score is a reason to look closer, not proof. I put all my test results on the Test Results page.
Credits
You have 5 of 5 free checks left today. You get 5 more every day.
If you make an account you get 10 credits a day (you can save up to 50), you can check up to 2,500 words at once, and your checks get saved so you can look at them later.
What it checks for
The first thing Optimal does is look for tricks hidden in the characters themselves. Some tools put invisible characters inside words, and some swap English letters for letters from other alphabets that look the same (like a Russian "а" instead of an English "a"). You can't see either one, but they confuse detectors.
It also checks for spun phrases. Paraphrasing tools sometimes turn normal terms into strange ones, for example "counterfeit consciousness" instead of "artificial intelligence."
After that, an AI reads the whole text and points out anything that seems off.
FAQ
What is a humanizer?
It's a tool that rewrites AI writing so detectors think a person wrote it. Some students use them to get past Turnitin. I wrote more about them in What Is an AI Humanizer?
Is Optimal an AI detector?
Not exactly. I made it to catch humanized text, since normal AI detectors usually miss it. It also looks at whether the writing reads like AI, because most humanized text still does, so plain AI writing usually gets flagged too (the numbers are on the Test Results page).
Does a high score prove someone cheated?
No. Hidden characters and fake letters are strong evidence, but the rest is just an estimate. I would use a high score as a reason to look closer at the writing, not as proof.