Head-to-head comparison
WriteHuman AI vs Undetectable AI
Tested side by side with the same prompts, same detectors, same scoring. Here is how they compare on bypass rate, meaning preservation, readability, pricing, and which writer each tool actually suits best.
WriteHuman AI
Undetectable AI
Side-by-side scores
Both tools were tested with 30 identical prompts across 6 writing categories (academic essays, blog posts, marketing copy, news articles, application essays, discussion posts). Each output was scored by 5 independent AI detectors. Here is how the numbers compare:
| Metric | WriteHuman AI | Undetectable AI | Winner |
|---|---|---|---|
| Overall Score | 83.59 | 80.09 | WriteHuman AI |
| Bypass Rate | 84.5% | 94.1% | Undetectable AI |
| Meaning Preservation | 82.1 | 72.2 | WriteHuman AI |
| Readability | 100 | 100 | Tie |
| Penalties | 0 | -8 (length inflation) | WriteHuman AI |
Detector-by-detector results
Not all detectors work the same way. Here is how each tool performed against each of the 5 detectors we tested. The tool with the higher bypass score on each detector is highlighted.
WriteHuman AI wins on 3 of 5 detectors. Undetectable AI wins on 2.
Our verdict
WriteHuman AI is the stronger overall performer in this matchup. and it wins against 3 of the 5 detectors where there is a clear winner. It finishes 3.5 points ahead on overall score.
Undetectable AI is not a bad tool. It holds a meaningful advantage against GPTZero and Winston AI. However, its penalty load of 8 points (length inflation) is significant, meaning it is more likely to alter what your text actually says.
For most use cases, WriteHuman AI is the better pick. The exception is workflows that specifically target GPTZero or Winston AI, where Undetectable AI’s advantage gives it a genuine edge.
Pricing comparison
Price alone should not drive the decision, but it is worth knowing what you are paying for. Here is how these two compare on the entry-level monthly plan:
Free tier available
Free tier available
WriteHuman AI is 37% cheaper at $12/mo vs $19/mo. Both offer a free tier to test before committing.
Who should pick which
Different tools suit different workflows. Here is a practical breakdown of when each tool is the better fit:
Pick WriteHuman AI if…
- You want the higher overall score and broader detector coverage
- Meaning preservation matters to your workflow
- Budget matters and you prefer the lower-priced option ($12/mo vs $19/mo)
- You want fewer quality penalties and cleaner output
- Copyleaks is your primary detection concern (81.2 vs 74.6)
Pick Undetectable AI if…
- GPTZero is your primary detection concern (95.1 vs 87.3)
- Winston AI is your primary detection concern (96.7 vs 88.1)
- You have tested it yourself and prefer its specific output style
Related comparisons
Frequently asked questions
Is WriteHuman AI better than Undetectable AI?
In our independent testing across 5 AI detectors, WriteHuman AI scored 83.59 overall compared to Undetectable AI at 80.09. WriteHuman AI wins on raw bypass rate (84.5% vs 94.1%) and leads on 3 of 5 detectors. The better choice depends on which specific detectors matter most to your workflow.
Which is cheaper, WriteHuman AI or Undetectable AI?
WriteHuman AI starts at $12/month with a free tier. Undetectable AI starts at $19/month with a free tier.
Which AI humanizer is best for bypassing Turnitin?
Between these two tools, WriteHuman AI performs better against Originality.ai (which Turnitin’s detection is based on), scoring 80.9 compared to 66.3. If Turnitin specifically is your concern, WriteHuman AI has the edge in this matchup.
How were these AI humanizers tested?
We tested both tools using identical prompts across 6 writing categories (academic essays, blog posts, marketing copy, news articles, application essays, discussion posts), then ran every output through 5 independent AI detectors. Our full methodology is published at aihumanizertools.com/how-we-test-ai-humanizers/.
Next move
Use this comparison alongside the full reviews and our testing methodology before making a subscription decision.
Looking for the best AI humanizer? We tested 16 tools head-to-head. See our full Best AI Humanizer in 2026 ranking with bypass rates, pricing, and detailed reviews.