| Grammarly AI Humanizer | WriteBros.ai | |
|---|---|---|
| Starting price | $12/mo | $1.99/mo |
| Free tier | 0 words | 0 words |
| Bundled detector | No | No |
| Founded | 2024 | 2024 |
| Best for | Professionals who want more natural-sounding AI-assisted drafts without a dedicated bypass-focused 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 $12/mo.
Grammarly AI Humanizer: Included in Grammarly Premium ($12/mo annual) and Business plans.
WriteBros.ai: Lite plan from $1.99/mo (30k words); Plus $9.99/mo; Pro $15/mo with API access.
Free tier: Grammarly AI Humanizer offers a more generous free tier (0 words).
If you just want to test either tool before paying, Grammarly AI Humanizer's 0-word allowance gives you more room to evaluate quality.
Detection performance
Grammarly AI Humanizer: Grammarly is explicit that the feature is meant to improve natural tone rather than guarantee detector evasion, which sets it apart from bypass-first competitors.
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
Grammarly AI Humanizer
- Built into an app most professionals already have installed (browser, desktop, Docs)
- Focuses on clarity and flow rather than aggressive detection evasion
- Backed by Grammarly's long-standing grammar and tone engine
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 Grammarly AI Humanizer if: professionals who want more natural-sounding ai-assisted drafts without a dedicated bypass-focused tool. Choose WriteBros.ai if: budget-conscious, high-volume users willing to run text through multiple passes for the best score.
Full Grammarly AI Humanizer review → · Full WriteBros.ai review →