Best Grammar Checker for Mac in 2025: Native Apps Compared

Mac users have unique needs when it comes to grammar checking. You want something that integrates seamlessly with macOS, works in native apps like Apple Mail and Notes, and takes advantage of Apple Silicon performance. Let's find the best grammar checker for your Mac.

What Makes a Great Mac Grammar Checker?

When evaluating grammar checkers for Mac, we looked at:

• Native macOS integration: Works in all apps, not just browsers
• Apple Silicon support: Runs efficiently on M1/M2/M3 chips
• System-wide access: Available via keyboard shortcut or menu bar
• Performance: Lightweight and doesn't drain battery
• Privacy: Respects Apple's privacy-focused ecosystem

Top Grammar Checkers for Mac

1. WriteZap - Best Overall for Mac

WriteZap was built with macOS in mind. It's a native app that lives in your menu bar and can be activated with a keyboard shortcut (⌘+Shift+G by default) in any application.

Why it's great for Mac:

• Native Apple Silicon support (runs blazingly fast on M1/M2/M3)
• Works in every Mac app—Mail, Notes, Slack, VS Code, you name it
• Minimal memory footprint (~100MB)
• Privacy-first design aligns with Apple's values
• Beautiful dark mode interface

Use case example:

You're writing an email in Apple Mail. Select your text, press ⌘+Shift+G, and instantly see grammar suggestions—no copying to a browser window needed.

2. Grammarly Desktop

Grammarly offers a Mac app, but it primarily works through a floating window and requires copying text.

Pros:

• Comprehensive grammar checking
• Tone detection

Cons:

• Not truly system-wide (limited app integration)
• Requires Rosetta on Apple Silicon
• Higher resource usage

3. macOS Built-in Spelling & Grammar

macOS includes basic spelling and grammar checking in Edit → Spelling and Grammar.

Pros:

• Free and built-in
• Works in all Cocoa apps
• Very private (on-device)

Cons:

• Basic grammar detection only
• No style or tone suggestions
• Limited to simple errors

4. LanguageTool for Mac

LanguageTool offers a Mac app with system-wide checking capabilities.

Pros:

• Open-source option
• Good multilingual support

Cons:

• Less polished Mac experience
• Slower response times

Performance Comparison on Apple Silicon

App	Native Apple Silicon	Memory Usage	Battery Impact
WriteZap	Yes	~100MB	Minimal
Grammarly	Rosetta	~400MB	Moderate
LanguageTool	Yes	~200MB	Low
Built-in	Yes	Included	None

Our Recommendation

For Mac users who want the best grammar checking experience, WriteZap offers the perfect combination of native performance, system-wide integration, and privacy. It's designed specifically for how Mac users work—with a simple keyboard shortcut that works everywhere.

The fact that it's built natively for Apple Silicon means it runs efficiently without draining your battery, and the privacy-first approach aligns perfectly with Apple's ecosystem philosophy.

"WriteZap is what macOS grammar checking should be—native, fast, and everywhere."