Head-to-head comparison
Undetectable AI vs Phrasly 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.
Undetectable AI
Phrasly 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 | Undetectable AI | Phrasly AI | Winner |
|---|---|---|---|
| Overall Score | 80.09 | 71.10 | Undetectable AI |
| Bypass Rate | 94.1% | 76.9% | Undetectable AI |
| Meaning Preservation | 72.2 | 71.4 | Undetectable AI |
| Readability | 100 | 100 | Tie |
| Penalties | -8 (length inflation) | -6 (meaning drift, length inflation) | Phrasly 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.
Undetectable AI wins on 4 of 5 detectors. Phrasly AI wins on 1.
Our verdict
Undetectable AI is the stronger overall performer in this matchup. Its bypass rate (94.1%) is higher than Phrasly AI’s (76.9%), and it wins against 4 of the 5 detectors where there is a clear winner. The 8-point penalty for length inflation is a real issue, but even with that hit, Undetectable AI still finishes 9.0 points ahead on overall score.
Phrasly AI is not a bad tool. It holds a meaningful advantage against Originality.ai, which matters for users who specifically need to beat Turnitin (which uses Originality.ai’s detection engine). However, its penalty load of 6 points (meaning drift, length inflation) is significant, meaning it is more likely to alter what your text actually says.
For most use cases, Undetectable AI is the better pick. The exception is workflows that specifically target Originality.ai, where Phrasly 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
Phrasly AI is 21% cheaper at $14.99/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 Undetectable AI if…
- You want the higher overall score and broader detector coverage
- Raw bypass rate is your top priority (94.1% vs 76.9%)
- Meaning preservation matters to your workflow
- GPTZero is your primary detection concern (95.1 vs 78.2)
- Winston AI is your primary detection concern (96.7 vs 80.1)
Pick Phrasly AI if…
- Budget matters and you prefer the lower-priced option ($14.99/mo vs $19/mo)
- You want fewer quality penalties and cleaner output
- You have tested it yourself and prefer its specific output style
Related comparisons
Frequently asked questions
Is Undetectable AI better than Phrasly AI?
In our independent testing across 5 AI detectors, Undetectable AI scored 80.09 overall compared to Phrasly AI at 71.10. Undetectable AI wins on raw bypass rate (94.1% vs 76.9%) and leads on 4 of 5 detectors. The better choice depends on which specific detectors matter most to your workflow.
Which is cheaper, Undetectable AI or Phrasly AI?
Undetectable AI starts at $19/month with a free tier. Phrasly AI starts at $14.99/month with a free tier.
Which AI humanizer is best for bypassing Turnitin?
Between these two tools, Phrasly AI performs better against Originality.ai (which Turnitin’s detection is based on), scoring 68.1 compared to 66.3. If Turnitin specifically is your concern, Phrasly 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.