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GrammarFast

A lightweight Mac app, made for messaging.
Fixes the grammar, keeps the personality.

the deck still has teh old pricing, dont send it yte The deck still has the old pricing. Don’t send it yet.

can we move the meting to friday, tuesday is bad fro me Can we move the meeting to Friday? Tuesday doesn’t work for me.

i lookd at the numbres again and we shoud probabley hold off I looked at the numbers again, and we should probably hold off.

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No copy-paste ritual. No separate editor. Select the text, use your favorite shortcut, and the text is fixed.

Download for macOS Native macOS · Works in Slack, email, Notes, and more

Slack Telegram Mail Notes Many more!

Simple pricing

$5 / month

Generous daily limit

Download the app first. Sort out billing later.

Questions, answered

Does GrammarFast work in any app?

If you can select text on macOS, GrammarFast can usually fix it. That includes Slack, email, Notes, and the other places you type all day.

Does GrammarFast store my text?

No. Your selected text is processed in-flight, sent back, and not stored, logged, or used for training.

Do I need to pay before downloading?

No. Get the app onto your Mac first. Payment can wait until later in the setup flow.

Is there a length limit?

GrammarFast is built for chat-length messages, so selections are capped at around 1,500 characters — enough for a long Slack message, but not for full documents.

Is there a daily usage cap?

There's a soft cap in place to keep spam and abuse off the service. Normal daily use — even a chatty day — won't come close to hitting it.