Our take
One of the best mainstream ways for writers to show their process. A natural alternative or complement to Prove Human.
At a glance
- Best for: Writers who already use Grammarly and want to show how they wrote something
- Free option: AI detector and Authorship are both available on the free plan, per Grammarly
- Website: grammarly.com
Main features
- Free AI detector
- Authorship: tracks typed, pasted, and AI-assisted text
- Color-coded report and replay of the writing process
- Works in Google Docs, Microsoft Word, and the Grammarly editor
Strengths
- Process evidence where people already write
- Free
- Honest that detection and authorship tracking are different
Limits and concerns
- Authorship depends on Grammarly running while you write
- Reports are produced by the writer’s own Grammarly setup rather than an independent sealed record
Remember: no detector score is proof that someone used AI. How accurate are AI detectors?
Sources
Last reviewed October 2026. Features and free limits change often; check the product’s site for current details. We have no affiliate relationship with any product reviewed here.