We tested 25+ AI humanizer tools so you don't have to. Each tool is evaluated for content quality, AI detection bypass rate, speed, and value.
| Feature | ⭐ Top Pick Undetectable AI | QuillBot | WriteSonic | Walter AI | Grubby AI |
|---|---|---|---|---|---|
Free Tier | |||||
Bypass GPTZero | |||||
Bypass Turnitin | |||||
Bypass Grammarly | |||||
Bulk Humanizing | |||||
API Access | |||||
Our Rating | 4.9/5 | 4.7/5 | 4.5/5 | 4.3/5 | 4.0/5 |
Undetectable AI is widely considered the best AI humanizer on the market in 2025. We put it through rigorous testing across 10 different AI detectors to give you a real picture of what it can do.
QuillBot is one of the most popular AI writing tools, and its paraphrasing engine works surprisingly well as an AI humanizer. But how does it stack up against dedicated humanizer tools?
WriteSonic is best known as an AI content creation platform, but it has added AI humanizer functionality that promises to make AI-generated text bypass detectors. Here is our full assessment.