TextHumanizer vs Undetectable.ai
A full comparison of features, pricing, free tier limits, and AI detection bypass performance.
Last updated June 2025
TextHumanizer
- ✓ Unlimited free tier no word cap
- ✓ No signup needed to start
- ✓ Bypasses all major detectors
- ✓ Built-in AI detection scoring
Undetectable.ai
- ~ Free tier capped at 250 words
- ~ Signup required for free tier
- ✓ Bypasses major detectors
- ✓ Multiple humanization modes
Full feature comparison
| Feature | TextHumanizer | Undetectable.ai |
|---|---|---|
| Free tier | Yes unlimited words | Yes 250 words max |
| Signup required for free | No | Yes |
| Bypasses GPTZero | Yes | Yes |
| Bypasses Turnitin | Yes | Yes |
| Bypasses Originality.ai | Yes | Yes |
| Bypasses Copyleaks | Yes | Yes |
| AI detection score check | Yes | Yes |
| Tone customization | Yes (paid) | Yes (paid) |
| Humanization history | Yes (signed in) | Yes (signed in) |
| API access | Paid plans | Paid plans |
| Meaning preservation | High | High |
| Starting price | Free | Free (limited) |
Key differences explained
Free tier the biggest difference
Undetectable.ai's free tier is limited to 250 words per humanization roughly two short paragraphs. This is enough to try the tool, but not enough for any real use case (a blog post intro, a student paragraph, or a product description). TextHumanizer's free tier has no word limit. You can humanize a full essay, article, or email without paying anything.
No signup required
TextHumanizer lets you humanize text immediately without creating an account. Undetectable.ai requires signing up even for the free tier. If you're a first-time user who just wants to try the tool, TextHumanizer is faster to access.
Detection bypass performance
Both tools target the same fundamental signals perplexity and burstiness and both produce significantly reduced AI detection scores. The difference is marginal on most standard content. Both tools struggle more on highly technical content where AI writing patterns are harder to mask without changing meaning.
Output quality
Undetectable.ai offers multiple humanization modes (More Human, Balanced, More Readable, etc.) which gives users more control over the output style. TextHumanizer's default output prioritizes natural-sounding prose and meaning preservation without mode selection. Paid plans on TextHumanizer offer custom tone settings.
Which tool should you use?
Choose TextHumanizer if:
- ✓You want a genuinely free tool with no word cap
- ✓You don't want to create an account
- ✓You're humanizing occasional content
- ✓You want built-in AI detection scoring alongside humanization
- ✓You're a student or non-native English speaker
Consider Undetectable.ai if:
- →You need multiple output modes (readable, balanced, etc.)
- →You're a professional on a paid plan
- →You specifically want to compare humanization styles
- →You need API access for workflow integration
FAQ
Is TextHumanizer better than Undetectable.ai?
TextHumanizer and Undetectable.ai are both capable AI humanizers. The key differences: TextHumanizer has a completely free tier with no word limits and no signup required. Undetectable.ai's free tier is limited to 250 words and requires signup. For users who need to humanize occasional content for free, TextHumanizer is the better option. For high-volume professional use, both have comparable paid plans.
What is Undetectable.ai's free word limit?
Undetectable.ai's free tier allows up to 250 words per humanization. Beyond that, a paid subscription is required. TextHumanizer's free tier has no word limit.
Do both tools bypass GPTZero and Turnitin?
Both TextHumanizer and Undetectable.ai are designed to bypass major AI detectors including GPTZero, Turnitin, Originality.ai, and Copyleaks. Neither tool guarantees 100% pass rates on all content types, but both significantly reduce AI detection scores on the major detectors.
Does TextHumanizer require signup?
No. TextHumanizer's free tier requires no signup or credit card. Paste text and humanize immediately. Undetectable.ai requires account creation even for free tier access.