ComparisonUndetectable AIAlternatives
5 Best Undetectable AI Alternatives in 2025 (Tested)
Looking for Undetectable AI alternatives? We tested the top 5 tools that match or beat Undetectable AI on bypass rates, price, and usability.
ChimpWrite TeamFebruary 7, 20258 min read
Undetectable AI is widely considered the gold standard for AI detection bypass. But its pricing is not for everyone.
The 5 Best Undetectable AI Alternatives
1. QuillBot (Best Free Alternative) — 4.7/5
| Detector | Undetectable AI | QuillBot Fluency |
|---|---|---|
| GPTZero | Excellent | Good |
| Grammarly | Excellent | Good |
| Originality.ai | Excellent | Moderate |
| Turnitin | Excellent | Moderate |
Best for: Users who do not need Turnitin bypass and want a free option.
Free tier: 125 words per paraphrase
Paid: From $9.95/month
2. Humanize.pro (Best Budget Alternative) — 4.2/5
- ~300 words/day free
- Simple, fast interface
- Good GPTZero and Grammarly bypass
- Weaker on Turnitin
3. Paraphraser.io (Best Unlimited Free Option) — 3.8/5
- Truly unlimited free tier
- No signup required
- Lower output quality than dedicated humanizers
4. StealthGPT (Best Turnitin Alternative) — 4.4/5
| Detector | Undetectable AI | StealthGPT |
|---|---|---|
| GPTZero | Excellent | Excellent |
| Turnitin | Excellent | Very Good |
| Originality.ai | Excellent | Good |
Price: From $14.99/month
5. ChimpWrite Free AI Humanizer (Best Completely Free Option) — 4.0/5
Our free AI humanizer tool — 500 words per request, no signup.
Best for: Quick humanizing tasks, low-volume content.
Full Comparison Table
| Tool | Free Tier | GPTZero Bypass | Turnitin Bypass | Price (Paid) |
|---|---|---|---|---|
| Undetectable AI | Trial only | Excellent | Excellent | $9.99/mo |
| QuillBot | 125 words/req | Good | Moderate | $9.95/mo |
| Humanize.pro | 300 words/day | Good | Moderate | ~$8/mo |
| Paraphraser.io | Unlimited | Moderate | Weak | Free |
| StealthGPT | None | Excellent | Very Good | $14.99/mo |
| ChimpWrite | 500 words/req | Good | Weak | Free |
Bottom Line
For most everyday humanizing needs, QuillBot or our free tool are excellent alternatives at no cost. Only invest in Undetectable AI or StealthGPT if Turnitin bypass is genuinely required.
Last updated: February 16, 2025