| Undetectable AI | HIX Bypass | |
|---|---|---|
| Starting price | $9.99/mo | $19.99/mo |
| Free tier | 250 words | 500 words |
| Bundled detector | Yes | Yes |
| Founded | 2022 | 2023 |
| Best for | Teams that want one tool to both check and rewrite content across multiple AI models. | Non-native English writers and international content teams producing multilingual output. |
Price: Undetectable AI is cheaper to start, at $9.99/mo vs $19.99/mo.
Undetectable AI: $9.99/mo for the entry tier; higher tiers scale by word volume.
HIX Bypass: From $19.99/mo as a standalone tool, cheaper when bundled with HIX.AI's writer.
Free tier: HIX Bypass offers a more generous free tier (500 words).
If you just want to test either tool before paying, HIX Bypass's 500-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.
HIX Bypass: Testing shows more consistent scores across languages than most English-first competitors.
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)
HIX Bypass
- One of the few tools with genuinely strong non-English output (Spanish, French, German, Chinese)
- Bundled with HIX.AI's broader writing, chat, and image suite
- 500-word free tier is more generous than most competitors
Our verdict
Choose Undetectable AI if: teams that want one tool to both check and rewrite content across multiple ai models. Choose HIX Bypass if: non-native english writers and international content teams producing multilingual output.