Head-to-head comparison
Stealth Writer vs Undetectable AI
Stealth Writer rates higher overall in the October 2026 AIHT edition: 84.47/100 against 80.09 for Undetectable AI (rank 2 and 6 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.
Swipe horizontally to compare the rating records →
| Rating record | Stealth Writer | Undetectable AI |
|---|---|---|
| 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
Swipe horizontally to compare all score columns →
| Metric | Stealth Writer | Undetectable AI | Winner |
|---|---|---|---|
| Overall Score | 84.47 | 80.09 | Stealth Writer |
| Bypass Rate | 89.5% | 94.1% | Undetectable AI |
| Meaning Preservation | 79.8 | 72.2 | Stealth Writer |
| Readability | 100 | 100 | Tie |
| Penalties | -1 (minor length inflation) | -8 (length inflation) | Stealth Writer |
Detector-by-detector results
This table compares the recorded figures for five detectors and highlights the higher value in each row.
| Detector | Stealth Writer | Undetectable AI |
|---|---|---|
GPTZero | 91.2 | 95.1 |
Proofademic | 93.8 | 96.7 |
ZeroGPT | 84.1 | 78.3 |
Copyleaks | 88.7 | 74.6 |
Originality.ai | 82.3 | 66.3 |
Our verdict
Editor's assessment
Stealth Writer 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 4.4 points ahead on overall score.
Undetectable AI is not a bad tool. It holds a meaningful advantage against GPTZero and Proofademic. 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, Stealth Writer is the better pick. The exception is workflows that specifically target GPTZero or Proofademic, where Undetectable AI's advantage gives it a genuine edge.
Plan details, checked 23 October 2026
Where shown, entry plans and allowances are as displayed on the tool’s own pricing page on 23 October 2026. Prices change, so confirm on the vendor page before you subscribe.
| Tool | Entry plan | Price as listed | Allowance | Limit | Free option |
|---|---|---|---|---|---|
| Stealth Writer | Starter | $20/mo (monthly billing) | 50 humanizations/day | 5,000 words per input | Free plan: 10 humanizations/day, 1,000 words per input |
| 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 |
Scorecard summary. On the published figures, Stealth Writer has the higher AIHT Rating (84.47 against 80.09), while Undetectable AI lists the lower entry price ($5/mo (billed annually) against $20/mo). Prices were read from each tool’s own pricing page. Neither number shows which tool will suit your draft, so run the same passage through both.
Sources: Stealth Writer pricing page Undetectable AI pricing page.
Who should pick which
Different tools suit different workflows. Here is a practical breakdown of when each tool is the better fit:
Pick Stealth Writer if...
- You want the higher overall score and broader detector coverage
- Meaning preservation matters to your workflow
- Budget matters and you want to compare entry plans first (see the plan details above)
- You want fewer quality penalties and cleaner output
- ZeroGPT is your primary detection concern (84.1 vs 78.3)
Pick Undetectable AI if...
- You have tested it yourself and prefer its specific output style
Reviews and rankings
Frequently asked questions
About Stealth Writer vs Undetectable AI
In this stored five-detector scorecard, Stealth Writer scored 84.47 overall compared to Undetectable AI at 80.09. Stealth Writer wins on raw bypass rate (89.5% vs 94.1%) 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 Stealth Writer review Read the Undetectable AI 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.