Check My Grammar Instantly in Any Mac App

You just sent an email that says "Me and my colleague was discussing about the project." The spelling is perfect. A spell checker won't flag a single word. But the grammar is wrong in three different ways — and your recipient noticed every one of them.

If you've ever searched for a way to check my grammar on a Mac, you've probably landed on browser-based tools like Grammarly or LanguageTool. They work inside Chrome or Safari, but they can't touch what you write in Mail, Slack, Notes, or any native macOS app. You need something that works everywhere your Mac does.

Check My Grammar with a Keyboard Shortcut

WunderType is a macOS menu bar app that lets you create Custom Prompts — AI-powered text actions you trigger with a keyboard shortcut. You can build a dedicated grammar checker that targets the errors a spell checker ignores: subject-verb agreement, verb tense consistency, pronoun case, and homophones.

Select text in any app, press your shortcut, and the corrected text replaces the original in place. No copying, no pasting, no switching to a browser tab.

Grammar Errors vs. Spelling Errors

A spelling checker catches misspelled words. A grammar checker catches structurally broken sentences where every individual word is spelled correctly. These are two different problems.

Common grammar mistakes that spell checkers miss entirely:

• Subject-verb agreement: "My colleague and I was discussing" → should be "were discussing"
• Pronoun case: "Me and my colleague" → should be "My colleague and I"
• Wrong tense: "We have came to a conclusion" → should be "have come"
• Homophones: "Their going to inform" → should be "They're going to inform"
• Determiner errors: "about this changes" → should be "about these changes"

Every example above would pass a dictionary-based spell check without a single warning. That is exactly why you need a separate grammar check.

See It in Action

Here is a short paragraph with five distinct grammar errors — not a single misspelled word:

Before

Me and my colleague was discussing about the project yesterday. We have came to a conclusion that the deadline need to be extended. Their going to inform the client about this changes next week.

Select the text, press ⌥⌘G, and WunderType returns:

After

My colleague and I were discussing the project yesterday. We have come to the conclusion that the deadline needs to be extended. They're going to inform the client about these changes next week.

Five grammar corrections. Zero style changes. The meaning and tone are identical — the sentences are just grammatically correct now.

Set Up a Grammar Checker in 30 Seconds

1. Click the WunderType icon in your menu bar and open Custom Prompts
2. Create a new prompt named "Grammar Check" with this instruction: Fix grammatical errors including subject-verb agreement, verb tense, pronoun case, and homophones. Do not change style, tone, or word choice beyond what is needed to correct the grammar.
3. Assign ⌥⌘G as your shortcut

That is it. You now have a grammar checker that works in every app on your Mac — Mail, Slack, Pages, Notes, TextEdit, or any other application.

Why Not Just Use a Browser Grammar Tool?

Browser-based grammar checkers only work inside your browser. If you write in native Mac apps — and most Mac users do — those tools are invisible. WunderType runs at the system level, so your grammar check works in every text field on your Mac.

There is also the question of privacy. Many online grammar checkers send your text to remote servers. WunderType supports local AI models through Ollama, so your writing can stay on your machine if you prefer.

Download WunderType from the Mac App Store and stop sending emails with grammar mistakes.