Slack · macOS

Grammar checker for Slack on Mac

The Slack desktop app on macOS doesn't run browser extensions, so Grammarly can't check your messages there. GrammaticAI fixes that: it works directly inside the Slack Mac app — and every other app — so you can clean up grammar and tone before you hit send, using one keyboard shortcut.

Why Grammarly doesn't work in Slack on Mac

Grammarly's grammar checking is delivered through a browser extension. The Slack desktop app is a native macOS application, not a browser tab, so the extension never loads. You're left proofreading Slack messages by hand — or pasting them into another app first.

How to fix grammar in Slack with GrammaticAI

1. Type your message in Slack as usual.
2. Select the text and press your GrammaticAI shortcut (for example ⌘⇧↵).
3. The improved version replaces your draft in about a second.
4. Not quite right? Press ⌘Z to undo — GrammaticAI pastes natively, so undo just works.

You can also switch tone between casual and formal, or translate your message into another language, all from the same shortcut. It's the same workflow you'd use in Gmail, Notion, Linear, or your code editor.

Related

• The Grammarly alternative for Mac that works in every app
• See all of GrammaticAI's features