About Grammar Checker

We believe grammar correction should fix your mistakes without flagging you as AI-generated.

Our Mission

The only grammar checker that won't get you flagged by AI detectors. Built to fix grammar while preserving your natural voice.

Every other grammar checker 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. 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

Our 7-stage pipeline ensures grammar corrections that keep your voice intact:

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

Grammar Checker 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 →