Install Claudio step by step

1. Download Claudio (zip file).
2. Double-click the zip to unpack it, then drag Claudio.app into your Applications folder.
3. Double-click Claudio: the mustache appears in the menu bar, at the top right of your screen.

No security warning: the app is signed and notarized by Apple. If macOS still shows a warning, the download came from another source — go back through this site or GitHub.

The API key is what connects Claudio to Anthropic's Claude engine. It's yours: you pay only what you use, with no subscription — around 0.2¢ per action with the default model. No Claude subscription needed: the API console is a separate service with its own free account.

1. Create an account on console.anthropic.com (email or Google account). It's Anthropic's "developer" console — don't be intimidated, you'll only make three clicks there.
2. Add credit: Settings → Billing, then buy credits ($5 minimum — enough for months of daily use).
3. Create the key: Settings → API keys → Create key. Give it a name ("Claudio") and copy the key starting with sk-ant-… — it's shown only once.
4. In Claudio: click the mustache in the menu bar → Settings… → API key tab → paste the key → Save.

Where does the key go? Into the macOS Keychain, encrypted by the system. Claudio has no server: your key and your text only travel from your Mac to the Anthropic API, over HTTPS. The code is open source — anyone can check.

This is the official macOS mechanism that lets Claudio read the text you select in another app, then paste the result back. Without this permission, nothing can work.

1. Select a word in any app and press ⌃⌥⌘I (control + option + command + I): macOS shows a permission request.
2. Click Open System Settings and flip the switch next to Claudio in the Accessibility list.
3. Press the shortcut again: this time, the panel appears.

If the request doesn't show up: open System Settings → Privacy & Security → Accessibility, click +, pick Claudio in Applications, and flip the switch. Then quit and relaunch Claudio (mustache → Quit Claudio).

Open Notes, type a sentence with a couple of typos, select it, press ⌃⌥⌘I. The panel appears, the fix writes itself before your eyes, and ⏎ pastes it over your text. All shortcuts are listed (and customizable) in Settings.