| GPTinf | WriteBros.ai | |
|---|---|---|
| Starting price | $12/mo | $1.99/mo |
| Free tier | 200 words | 0 words |
| Bundled detector | No | No |
| Founded | 2023 | 2024 |
| Best for | Writers who want granular control over tone and which specific sentences get rewritten. | Budget-conscious, high-volume users willing to run text through multiple passes for the best score. |
Price: WriteBros.ai is cheaper to start, at $1.99/mo vs $12/mo.
GPTinf: From $12/mo, scaling with monthly word volume.
WriteBros.ai: Lite plan from $1.99/mo (30k words); Plus $9.99/mo; Pro $15/mo with API access.
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
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.
WriteBros.ai: Achieved a 100% human GPTZero score in testing, but only after four iterative rewriting rounds rather than a single pass.
AI detector included: Neither tool bundles a built-in detector — pair either with GPTZero or Originality.ai.
Strengths at a glance
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
WriteBros.ai
- By far the lowest starting price of any tool reviewed here
- Removes common AI 'tells' like overused em-dashes and uniform sentence rhythm
- Pro tier includes API access for automated pipelines
Our verdict
Choose GPTinf if: writers who want granular control over tone and which specific sentences get rewritten. Choose WriteBros.ai if: budget-conscious, high-volume users willing to run text through multiple passes for the best score.