| QuillBot Humanizer | WriteBros.ai | |
|---|---|---|
| Starting price | $8.33/mo | $1.99/mo |
| Free tier | 125 words | 0 words |
| Bundled detector | Yes | No |
| Founded | 2017 | 2024 |
| Best for | People who already pay for QuillBot's grammar/paraphrase suite and want a decent bonus feature, not a dedicated bypass tool. | 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 $8.33/mo.
QuillBot Humanizer: $8.33/mo billed annually, $19.95/mo monthly. Free tier: 125 words, 6 uses/day.
WriteBros.ai: Lite plan from $1.99/mo (30k words); Plus $9.99/mo; Pro $15/mo with API access.
Free tier: QuillBot Humanizer offers a more generous free tier (125 words).
If you just want to test either tool before paying, QuillBot Humanizer's 125-word allowance gives you more room to evaluate quality.
Detection performance
QuillBot Humanizer: Consistently ranks behind dedicated humanizers on Turnitin and GPTZero in third-party comparisons because it leans on synonym substitution rather than deep sentence restructuring.
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: QuillBot Humanizer bundles a built-in detector; WriteBros.ai does not.
Strengths at a glance
QuillBot Humanizer
- Bundled AI detector, grammar checker, and paraphraser in one subscription
- Fast — results in under 5 seconds for short passages
- Color-coded change tracking so you can see exactly what was rewritten
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 QuillBot Humanizer if: people who already pay for quillbot's grammar/paraphrase suite and want a decent bonus feature, not a dedicated bypass tool. Choose WriteBros.ai if: budget-conscious, high-volume users willing to run text through multiple passes for the best score.
Full QuillBot Humanizer review → · Full WriteBros.ai review →