| Undetectable AI | Ryter Pro | |
|---|---|---|
| Starting price | $9.99/mo | $9.99/mo |
| Free tier | 250 words | 150 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 prioritizing the highest available bypass rate over brand familiarity. |
Price: Ryter Pro is cheaper to start, at $9.99/mo vs $9.99/mo.
Undetectable AI: $9.99/mo for the entry tier; higher tiers scale by word volume.
Ryter Pro: From $9.99/mo with a limited free trial.
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.
Ryter Pro: Named the outright top performer in at least one independent 2026 head-to-head test across four detectors.
AI detector included: Undetectable AI bundles a built-in detector; both both include one.
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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)
Ryter Pro
- Highest reported bypass rates in a multi-tool 2026 test (up to 97% on GPTZero, 94% on Turnitin-style checks)
- Genuine multilingual rewriting, not just translation-then-rewrite
- Fast processing speed even on long documents
Our verdict
Choose Undetectable AI if: teams that want one tool to both check and rewrite content across multiple ai models. Choose Ryter Pro if: users prioritizing the highest available bypass rate over brand familiarity.