Does Grammarly detect AI?
Writing assistant. Last updated . Every claim here links to a source at the bottom.
How does Grammarly check for AI?
Grammarly's AI detection estimates the share of text likely produced by AI, and its authorship feature can show how a document was created over time within Grammarly. The detection score is a statistical estimate of writing patterns, separate from its grammar and plagiarism checks.
What this means for you
If your institution or employer uses Grammarly's AI detection, the same cautions apply as for any detector. The score is a signal that invites a conversation, not a verdict. Authorship history only covers work actually written inside Grammarly.
Limitations to know
- AI detection is probabilistic and can flag genuine human writing.
- Authorship tracking only reflects work done within Grammarly's editor.
- Editing and paraphrasing reduce detection scores (Sadasivan et al. 2023).
What you should do
- Treat any Grammarly AI score as one signal among several, not as proof.
- Keep your own drafts and version history outside Grammarly too.
- Screen your writing with more than one tool to understand how it reads.
Check your own writing first
Is It AI? is free, with no signup. It highlights the passages that look AI-generated and explains why, so you can revise in your own voice before you submit.
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Sources
- Grammarly: AI detection and authorship
- Sadasivan et al. (2023): Can AI-generated text be reliably detected?
- Liang et al. (Stanford, 2023): GPT detectors are biased against non-native English writers