A grammar checker for developers that leaves your code alone

The English half of the job

For many engineers, the code is the easy part to get right in a second language. Then comes the writing around it: a PR description for a reviewer in another time zone, a comment on someone else’s code, a bug report that has to make sense to QA, an update in the incident channel at 2 a.m.

Small things cause real friction here. A review comment translated literally can sound harsh and start an argument. A vague ticket costs a round trip. A commit message nobody can parse a year from now doesn’t help anyone. AI Grammatic fixes the English and leaves the engineering to you.

Pull requests and commit messages

Write the description fast, in your own words, then select it and press the shortcut before you click Create. The same goes for the commit message box in VS Code or Xcode.

Review comments that don’t sound harsh

Code review is where tone matters most and where literal translation hurts most. In many languages a direct question is just a question. In English, “Why you did it like this?” reads as an accusation, even from someone who meant it as curiosity. The rewrite keeps your point and drops the edge.

Reviewing for an open source project, or for a team you don’t know well yet? Add ⇧ for the formal version: ⇧⌘⌥E.

Tickets, docs and Slack

The same shortcut works on a Jira or Linear ticket, a README, a Notion page or a message in Slack.

Code, identifiers and links stay put

A rewrite only changes the English. Code in backticks, function and variable names, links, issue numbers and @mentions come back as you wrote them, and so do the formatting and line breaks of your PR template. The result is about the same length as your draft, and it doesn’t add greetings, sign-offs or em dashes.

You can also write in your own language and get English out. Translation is built in, and it’s rewritten the way a native speaker would say it, not word for word.

If your team writes docs in German or another language, add the custom instruction “Keep technical terms in English” so terms like pull request or feature flag don’t get translated. Custom instructions take up to 500 characters on every plan, so you can add your team’s conventions too, for example “Write commit subjects in the imperative”.

Where it works

Anywhere you can select text: VS Code, Xcode, GitHub in Safari, Chrome or Arc, Linear, Jira, Slack and Notion. It’s a global shortcut that runs from the menu bar on macOS 14 or later, so there’s no extension to install per editor and nothing to configure per repo. The text is replaced in place in about a second, and since it’s a normal paste, ⌘Z brings back your original.

Each language gets its own shortcut (your default plus up to five more), and you can pick the rewrite style: neutral, professional, casual or concise. Concise works well for commit messages and tickets. Want to see a rewrite before installing anything? Try the live demo.

Where your text goes, and whose API key

Developers tend to ask about this first, so here it is plainly. On Pro ($29 a year) you connect your own OpenAI, Anthropic Claude, Google Gemini or DeepSeek API key. Your text goes straight from your Mac to your provider account, with no limit on rewrites.

On Free (10 rewrites a day, no account) and Premium ($69 a year, €59 in the EU, 50,000 words a day with your choice of model), the text passes through our server to the AI provider and is discarded after the rewrite. We only keep daily usage counts.

If your company has rules about sending internal text to AI services, check them first and pick the plan that fits. Details are in how we handle your text and on the pricing page.