Grammar Check on Mac: Built-In Tools vs an AI Upgrade

macOS can check your spelling out of the box, but real grammar checking on a Mac — catching awkward phrasing, wrong tenses, and clunky sentences — is thinner than most people expect. Here's how to use what's built in, and how to get a proper grammar checker that works in every app.

The built-in grammar check on Mac

Most native apps share one grammar engine. In Mail, Notes, TextEdit, or Pages, open the Edit menu → Spelling and Grammar and enable Check Grammar With Spelling. Errors get underlined; right-click for a suggestion. It's handy for obvious slips, but it misses tone, run-ons, and anything that's grammatically valid yet badly written.

A grammar checker that works in any Mac app

WunderType is a menu bar app that adds AI grammar checking system-wide. Select text anywhere — Slack, your browser, a code comment — press a shortcut, and it rewrites the selection with correct grammar while keeping your meaning and voice.

Me and him was going to finish the report but we didnt had enough time so its still not done.

becomes:

He and I were going to finish the report, but we didn't have enough time, so it's still not done.

Why it beats the built-in checker

• Works everywhere, not just Apple apps.
• Fixes grammar and clarity, not just red-underline typos.
• Your AI, your privacy — OpenAI or a local Ollama model.
• Custom Prompts — make your own "Fix Grammar," "Make Formal," or "Tighten" actions, each with a shortcut.

Download WunderType from the Mac App Store and get real grammar checking in every app on your Mac.