About HumanGrammar

We believe grammar correction should fix your mistakes, not rewrite your personality.

Our Mission

Every grammar checker on the market has the same problem: they treat writing like code to be debugged. They strip away contractions, inject formal transitions, and turn casual emails into corporate memos. HumanGrammar was built to solve this.

We built a 7-stage AI pipeline that understands the difference between a grammar error and a stylistic choice. Our Voice Lock technology actively prevents over-correction, and our Voice Drift Score gives you a quantitative measure of how well your original voice was preserved.

The Technology

Stage 1

Rule-Based Checks — LanguageTool catches obvious spelling and grammar errors.

Stage 2

Model-Based GEC — AI models fix nuanced grammatical issues that rules miss.

Stage 3

Clarity Rewrite — Improves readability while respecting your tone.

Stage 4

Style Guide — Applies custom style rules for consistent writing.

Stage 5

Voice Lock — Actively prevents corrections that would change your voice.

Stage 6

Drift Scoring — Measures how much your voice was preserved (0.0 = perfect).

Stage 7

Selection — Picks the best result — falls back if drift is too high.

Open Source & API

HumanGrammar offers a REST API for developers who want to integrate voice-preserving grammar correction into their own applications. Check out our API documentation to get started.

Try It Yourself

See the difference voice-preserving grammar correction makes.

Check Your Grammar Free →