| Undetectable AI | WriteHuman AI | |
|---|---|---|
| Starting price | $9.99/mo | $8/mo |
| Free tier | 250 words | 100 words |
| Bundled detector | Yes | No |
| Founded | 2022 | 2023 |
| Best for | Teams that want one tool to both check and rewrite content across multiple AI models. | Students who want an accessible entry point but should verify output with a second detector before submitting anything. |
Price: WriteHuman AI is cheaper to start, at $8/mo vs $9.99/mo.
Undetectable AI: $9.99/mo for the entry tier; higher tiers scale by word volume.
WriteHuman AI: From roughly $8/mo; 'Enhanced Model' available as a paid upgrade.
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.
WriteHuman AI: One of the more heavily marketed student-focused tools, though third-party detector testing found inconsistent results even on the paid tier.
AI detector included: Undetectable AI bundles a built-in detector; WriteHuman AI does not.
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)
WriteHuman AI
- Retry option lets you regenerate a rewrite if the first pass reads oddly
- Enhanced Model shows measurable improvement over the base tier
Our verdict
Choose Undetectable AI if: teams that want one tool to both check and rewrite content across multiple ai models. Choose WriteHuman AI if: students who want an accessible entry point but should verify output with a second detector before submitting anything.