| StealthGPT | GPTinf | |
|---|---|---|
| Starting price | $14.99/mo | $12/mo |
| Free tier | 0 words | 200 words |
| Bundled detector | No | No |
| Founded | 2023 | 2023 |
| Best for | Long-form academic or research writing where sentence-level restructuring matters more than speed. | Writers who want granular control over tone and which specific sentences get rewritten. |
Price: GPTinf is cheaper to start, at $12/mo vs $14.99/mo.
StealthGPT: Plans from $14.99/mo; per-word bundles available for one-off use.
GPTinf: From $12/mo, scaling with monthly word volume.
Free tier: GPTinf offers a more generous free tier (200 words).
If you just want to test either tool before paying, GPTinf's 200-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.
GPTinf: Marketed as being trained directly against detector models rather than general paraphrasing, which independent testers cite as the reason its scores hold up on technical text.
AI detector included: Neither tool bundles a built-in detector — pair either with GPTZero or Originality.ai.
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
GPTinf
- Eight distinct rewriting modes (Academic, Formal, Informal, Creative, Simple, Standard, Expand, Shorten)
- Freeze-keyword feature protects technical terms and proper nouns from being altered
- Selective, sentence-level rephrase instead of forcing a full rewrite
Our verdict
Choose StealthGPT if: long-form academic or research writing where sentence-level restructuring matters more than speed. Choose GPTinf if: writers who want granular control over tone and which specific sentences get rewritten.