| Undetectable AI | GPTHuman.ai | |
|---|---|---|
| Starting price | $9.99/mo | $25/mo |
| Free tier | 250 words | 200 words |
| Bundled detector | Yes | Yes |
| Founded | 2022 | 2024 |
| Best for | Teams that want one tool to both check and rewrite content across multiple AI models. | Users who want a built-in confidence score and don't mind paying a premium for it. |
Price: Undetectable AI is cheaper to start, at $9.99/mo vs $25/mo.
Undetectable AI: $9.99/mo for the entry tier; higher tiers scale by word volume.
GPTHuman.ai: Plans start at $25/mo — one of the pricier options in the category.
Free tier: Undetectable AI offers a more generous free tier (250 words).
If you just want to test either tool before paying, Undetectable AI's 250-word allowance gives you more room to evaluate quality.
Detection performance
Undetectable AI: Frequently cited as a top-tier performer against GPTZero and Originality.ai, though results vary by source text length and topic.
GPTHuman.ai: One independent tester reported it bypassed every detector used in their test suite, the strongest single result among tools they reviewed.
AI detector included: Undetectable AI bundles a built-in detector; both both include one.
Strengths at a glance
Undetectable AI
- Runs output against multiple detector models before returning it
- Supports long-document processing without manual chunking
- Adjustable readability and purpose settings (story, essay, article, email)
GPTHuman.ai
- Live 'Stealth Score' shows bypass likelihood before you export
- 'Re-humanize' feature reruns the pass if the first score isn't high enough
- Bypassed every detector tested in one independent 2026 review
Our verdict
Choose Undetectable AI if: teams that want one tool to both check and rewrite content across multiple ai models. Choose GPTHuman.ai if: users who want a built-in confidence score and don't mind paying a premium for it.