Aha is a writing layer for macOS. It lives in your menu bar and works in almost any text field: Mail, Slack, Notes, your browser, even the prompt box of an AI chat. While you type, it quietly fixes obvious typos on your Mac. When you press ⌘., Field Assist reads the field and writes, finishes or tidies it, shown as a highlighted preview you keep with ↩ or throw away with esc.
There’s no browser extension and no per-app plugin. Aha reads and edits text through macOS Accessibility, keeps your cursor where it was and never touches password fields.
Start here
Using Aha
Realtime correctionsThe typos Aha fixes as you type, and how to tune them.
Field AssistPress ⌘. and the field gets written, finished or fixed.
Smart PastePaste the clipboard adapted to wherever you’re pasting.
Keyboard shortcutsEvery shortcut and preview key in one table.
Make it yours
Rules and appsDifferent corrections and writing styles per kind of app.
Personal infoLet Aha fill in your details without sending them.
Account and usageSign-in, your weekly allowance and using your own key.
InsightsTypos fixed, words written and time saved, counted locally.