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Eko · How-to

How to fix grammar in any app on your Mac

macOS can flag basic spelling and grammar mistakes as you type, but it won’t rewrite a clunky sentence or work in every app. Eko does — select any text, anywhere, and press one shortcut to fix it in place. Here’s how both work.

Get Eko for Mac — $39

Steps

1

Turn on macOS’s built-in grammar check

Open System Settings → Keyboard → Text Input → Spelling and enable “Check spelling” and “Check grammar with spelling.” Underlines will flag issues as you type in supported apps.

2

Know its limits

macOS’s checker only works in apps built on Apple’s text system (Mail, Notes, TextEdit), it just underlines problems instead of fixing them, and it can’t rewrite awkward phrasing or tone.

3

Install Eko to fix grammar anywhere

Download Eko for Mac (Apple Silicon, macOS 14+), grant accessibility access, then select any text in any app — Slack, Gmail in the browser, Google Docs, a PDF form — and press ⌥C.

4

Let Eko rewrite it in place

Eko corrects grammar, spelling and punctuation and replaces the selected text instantly, no copy-pasting into another app. It runs on-device or with your own API key.

One shortcut. In any app. $39 once.

Eko is a Mac AI keyboard assistant: dictate, fix, translate, ask AI, read your screen and open apps — from one shortcut, in any app. Runs on-device or with your own API key. $39 once, no subscription.

Get Eko for Mac — $39

$39 once · No subscription · macOS 14.0 or later, Apple Silicon (M1+)

FAQ

How do I fix grammar in any app on a Mac?

Select the text and press ⌥C with Eko installed — it corrects grammar, spelling and punctuation in place, in any app. macOS’s built-in checker only underlines errors in a handful of Apple apps.

Does macOS have a built-in grammar checker?

Yes — System Settings → Keyboard → Text Input → Spelling lets you enable spelling and grammar checking, but it only works in apps built on Apple’s text system and just flags mistakes rather than fixing them.

What’s the best way to fix grammar across every app on Mac?

Eko — a one-time $39 app that corrects selected text in place with ⌥C in any app, from Slack to Google Docs to a browser form, running on-device or with your own API key.

Can I fix grammar without leaving the app I’m typing in?

Yes — with Eko, select the text, press ⌥C, and the corrected version replaces it right where you’re typing. No copying into another tool needed.