Does Grammarly Detect AI Writing?

Yes — Grammarly added an AI detection feature in 2024 as part of its authorship detection capabilities. However, it is less accurate than dedicated AI detection tools like Turnitin, GPTZero, or Originality.ai.

How Grammarly's AI Detection Works

Grammarly's AI detection is integrated into its existing writing analysis tool. It:

• Analyzes text for statistical patterns associated with AI generation
• Provides a percentage-based AI score
• Highlights sections that appear most likely to be AI-generated
• Works alongside grammar and style suggestions

Accuracy Compared to Dedicated Detectors

Grammarly's detection is less accurate because AI detection is a secondary feature — their primary product is grammar and writing assistance.

What Grammarly Does Well

• Convenience — AI detection built into a tool many writers already use
• Integrated workflow — check and fix grammar, style, and AI detection in one place
• Free tier — basic AI detection available without additional cost

Limitations

• Lower accuracy than specialized detectors
• Higher false positive rate
• Less detailed analysis (no perplexity or burstiness breakdown)
• Not accepted as a primary detection tool by most academic institutions

FAQ

Q: Should I use Grammarly to check if my text passes AI detection?

A: Grammarly's AI detection gives a rough estimate, but for reliable checking you should use a dedicated tool. TextHumanizer.pro's free AI detector scans against 5 major detectors simultaneously.

Q: Does running text through Grammarly's editor make it less detectable?

A: No. Grammarly's grammar and style suggestions don't change the underlying perplexity and burstiness patterns that AI detectors analyze.