| Undetectable AI | AI Natural Write | |
|---|---|---|
| Starting price | $9.99/mo | $7.99/mo |
| Free tier | 250 words | 400 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. | Budget-conscious writers, bloggers, and students who want strong results without a premium price tag. |
Price: AI Natural Write is cheaper to start, at $7.99/mo vs $9.99/mo.
Undetectable AI: $9.99/mo for the entry tier; higher tiers scale by word volume.
AI Natural Write: Free tier available; Pro plans from $7.99/mo.
Free tier: AI Natural Write offers a more generous free tier (400 words).
If you just want to test either tool before paying, AI Natural Write's 400-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.
AI Natural Write: Positioned by testers as the best value-for-money option, trading a few points of bypass rate for a meaningfully lower price.
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)
AI Natural Write
- Usable free tier without a credit card requirement
- Reported 91% bypass rate in independent testing, close to category leaders
- Straightforward, uncluttered interface
Our verdict
Choose Undetectable AI if: teams that want one tool to both check and rewrite content across multiple ai models. Choose AI Natural Write if: budget-conscious writers, bloggers, and students who want strong results without a premium price tag.
Full Undetectable AI review → · Full AI Natural Write review →