| GPTinf | Walter Writes AI | |
|---|---|---|
| Starting price | $12/mo | $9/mo |
| Free tier | 200 words | 200 words |
| Bundled detector | No | No |
| Founded | 2023 | 2023 |
| Best for | Writers who want granular control over tone and which specific sentences get rewritten. | Users who process the same type of document repeatedly and want predictable results every time. |
Price: Walter Writes AI is cheaper to start, at $9/mo vs $12/mo.
GPTinf: From $12/mo, scaling with monthly word volume.
Walter Writes AI: Plans from roughly $9/mo depending on monthly word allowance.
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.
Walter Writes AI: Cited in multiple 2026 comparisons as one of the more reliable mid-tier tools against GPTZero.
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
Walter Writes AI
- Reliable, repeatable output across multiple passes on the same document
- Praised in independent tests for maintaining natural sentence flow
- Simple flat pricing without confusing tiers
Our verdict
Choose GPTinf if: writers who want granular control over tone and which specific sentences get rewritten. Choose Walter Writes AI if: users who process the same type of document repeatedly and want predictable results every time.