Free AI Grammar Checker

HumanGrammar is the only AI grammar checker built specifically to preserve your writing voice. Unlike traditional grammar checkers that homogenize your text into bland, corporate prose, our 7-stage AI pipeline corrects errors while keeping the personality, tone, and style that make your writing uniquely yours.

Our Voice Drift Score technology measures exactly how much your original voice was preserved during correction. A score of 0.0 means no voice change at all, while 1.0 would mean a complete rewrite. Most corrections score below 0.10 — meaning over 90% of your original voice is preserved.

How the 7-Stage Pipeline Works

Every text you submit passes through seven carefully tuned stages: rule-based checks catch obvious errors, model-based GEC handles nuanced grammar issues, clarity rewriting improves readability, style guide enforcement ensures consistency, Voice Lock prevents over-correction, drift scoring measures voice preservation, and selection logic picks the best result.

Aggressiveness Levels

Choose how thoroughly HumanGrammar corrects your text. Level 0 (Light) fixes only critical spelling and grammar errors. Level 1 (Standard) is the default, handling grammar and spelling. Level 2 (Thorough) adds style improvements. Level 3 (Deep) runs the full 7-stage pipeline for maximum correction while still preserving your voice.