| StealthGPT | Phrasly AI | |
|---|---|---|
| Starting price | $14.99/mo | $12.99/mo |
| Free tier | 0 words | 300 words |
| Bundled detector | No | Yes |
| Founded | 2023 | 2023 |
| Best for | Long-form academic or research writing where sentence-level restructuring matters more than speed. | Users who want the current highest-ranked general-purpose humanizer without extra bundled features. |
Price: Phrasly AI is cheaper to start, at $12.99/mo vs $14.99/mo.
StealthGPT: Plans from $14.99/mo; per-word bundles available for one-off use.
Phrasly AI: $12.99/mo for unlimited humanization after a 300-word free allowance.
Free tier: Phrasly AI offers a more generous free tier (300 words).
If you just want to test either tool before paying, Phrasly AI's 300-word allowance gives you more room to evaluate quality.
Detection performance
StealthGPT: Positioned and marketed specifically around Turnitin's originality algorithm rather than general-purpose detectors.
Phrasly AI: The tool most frequently named 'best overall' in third-party 2026 testing roundups, ahead of Undetectable AI and StealthGPT.
AI detector included: Phrasly AI bundles a built-in detector; StealthGPT does not.
Strengths at a glance
StealthGPT
- Generates and rewrites in one pass, so you can skip a separate AI writer
- Aggressive sentence-level restructuring rather than word substitution
- No word cap on paid plans — good for full-length papers
Phrasly AI
- Consistently ranked #1 across several independent 2026 comparison tests
- Clean, minimal interface — paste, humanize, done
- Built-in detector shows a live score before you export
Our verdict
Choose StealthGPT if: long-form academic or research writing where sentence-level restructuring matters more than speed. Choose Phrasly AI if: users who want the current highest-ranked general-purpose humanizer without extra bundled features.