Head-to-head comparison
Undetectable AI vs StealthGPT
Undetectable AI rates higher overall in the October 2026 AIHT edition: 80.09/100 against 71.47 for StealthGPT (rank 6 and 8 of 16).
Compare the AIHT Ratings, detector figures and product features for these two tools, then read their individual reviews.
The stored scores do not establish which tool will produce the best rewrite for your draft.
Look beyond the score
→AIHT Rating records
Edition and evidence details for each tool’s overall AIHT Rating.
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| Rating record | Undetectable AI | StealthGPT |
|---|---|---|
| Edition | 2026-10 | 2026-10 |
| Method | editorial-baseline-v1 · Methodology | editorial-baseline-v1 · Methodology |
| Source | AIHT comparison scorecards, October 2026 edition. | AIHT comparison scorecards, October 2026 edition. |
| Evidence | AIHT Rating is an editorial score out of 100. Read the methodology for rating definitions. | AIHT Rating is an editorial score out of 100. Read the methodology for rating definitions. |
Correction history | No corrections are recorded for this edition. | No corrections are recorded for this edition. |
Side-by-side scores
This scorecard records a 30-prompt sample and summaries for five detectors. Compare the detector values alongside meaning retention and readability.
Data table
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| Metric | Undetectable AI | StealthGPT | Winner |
|---|---|---|---|
| Overall Score | 80.09 | 71.47 | Undetectable AI |
| Bypass Rate | 94.1% | 82.9% | Undetectable AI |
| Meaning Preservation | 72.2 | 67.7 | Undetectable AI |
| Readability | 100 | 100 | Tie |
| Penalties | -8 (length inflation) | -9 (meaning drift, length inflation, length deflation) | Undetectable AI |
Detector-by-detector results
This table compares the recorded figures for five detectors and highlights the higher value in each row.
| Detector | Undetectable AI | StealthGPT |
|---|---|---|
GPTZero | 95.1 | 83.6 |
Proofademic | 96.7 | 72.3 |
ZeroGPT | 78.3 | 65.7 |
Copyleaks | 74.6 | 83.3 |
Originality.ai | 66.3 | 78.8 |
Our verdict
Editor's assessment
Undetectable AI is the stronger overall performer in this matchup. Its bypass rate (94.1%) is higher than StealthGPT's (82.9%), and it wins against 3 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 8.6 points ahead on overall score.
StealthGPT is not a bad tool. It holds a meaningful advantage against Copyleaks and Originality.ai, which matters for users who specifically need to beat Turnitin (which uses Originality.ai's detection engine). However, its penalty load of 9 points (meaning drift, length inflation, length deflation) 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 Copyleaks or Originality.ai, where StealthGPT's advantage gives it a genuine edge.
Plan details, checked 23 and 26 October 2026
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| Tool | Entry plan | Price as listed | Allowance | Limit | Free option |
|---|---|---|---|---|---|
| Undetectable AI | Entry plan | $9.99/mo, or $5.00/mo billed $60 annually | 10,000 words/month | Not stated on page | Free trial limited to 250 words |
| StealthGPT | Pro | $29.99/mo as displayed (monthly toggle) | 50,000 words/month | 1,000 words per request | No free plan listed |
Sources and evidence
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 82.9%)
- Meaning preservation matters to your workflow
- You want a free tier to test before subscribing
- Budget matters and you want to compare entry plans first (see the plan details above)
Pick StealthGPT if...
- Copyleaks is your primary detection concern (83.3 vs 74.6)
- Originality.ai is your primary detection concern (78.8 vs 66.3)
- You have tested it yourself and prefer its specific output style
Reviews and rankings
Frequently asked questions
About Undetectable AI vs StealthGPT
In this stored five-detector scorecard, Undetectable AI scored 80.09 overall compared to StealthGPT at 71.47. Undetectable AI wins on raw bypass rate (94.1% vs 82.9%) and leads on 3 of 5 detectors. The better choice depends on which specific detectors matter most to your workflow.
Next move
Use this comparison alongside the full reviews and our testing methodology before making a subscription decision. See the full ranking Read the Undetectable AI review Read the StealthGPT review Looking for the best AI humanizer? We tested 16 tools head-to-head. See the full AI humanizer leaderboard with AIHT Ratings, pricing and detailed reviews.
