A Spelling Checker That Works in Every Mac App

macOS has a built-in spell checker, and it's fine for catching obvious typos. But it won't touch awkward phrasing, informal language that slipped into a professional document, or sentences that are technically spelled correctly but sound wrong. You end up with text that passes the red-squiggle test but still reads like a rough draft.

Browser-based spelling checkers like Grammarly work well — inside your browser. But they don't help when you're writing in Mail, Slack, Notes, or any native Mac app. You need something that works everywhere.

How WunderType Handles It

WunderType is a macOS menu bar app that lets you create Custom Prompts — AI-powered text actions triggered by keyboard shortcuts. You can build a spelling checker that doesn't just fix misspelled words, but also cleans up informal phrasing, tightens sentence structure, and brings your writing up to a professional standard.

Select your text in any app, press your shortcut, and the improved text replaces the original. No copy-paste, no switching windows.

See It in Action

Here's a paragraph from a student report that's riddled with informal phrasing:

Before

The study showed that the results were kinda inconclusive, and it was a real pain to analyze. We had to dig through a lot of data, which was super frustrating. Also, the methodology wasn't really explained clearly enough, which is a problem. It needs more detail and a stronger conclusion.

Select the text, press ⌥⇧⌘E, and WunderType transforms it to:

After

The study yielded inconclusive results and presented significant analytical challenges. Extensive data review proved frustrating. Furthermore, the methodology lacked sufficient clarity, necessitating improved detail and a more robust conclusion.

Every word is spelled correctly in both versions — but the "after" version is what you'd actually want to submit. That's the difference between a basic spell check and an AI-powered writing polish.

Beyond Red Squiggles

Traditional spelling checkers flag individual words. WunderType's Custom Prompts understand context. They can catch homophones ("their" vs. "there"), fix colloquialisms in formal documents, and improve clarity — things a dictionary-based checker will never flag. And because you write the instruction yourself, you control exactly what it fixes.

Set It Up in 30 Seconds

1. Click the WunderType icon in your menu bar and open Custom Prompts
2. Create a new prompt named "Spelling Checker" with this instruction: Fix spelling errors, clean up informal phrasing, and improve sentence clarity while preserving the original meaning
3. Assign a keyboard shortcut — now it works in any app on your Mac

Works Everywhere macOS Does

Mail, Slack, Pages, Notes, TextEdit, Google Docs in Safari — WunderType works system-wide. No extensions per app, no browser limitations. One shortcut covers your entire Mac.

Download WunderType from the Mac App Store and get a spelling checker that actually improves your writing.