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Triple-tap Cmd-C on macOS to run AI grammar and style correction on selected text in any app.
CMD-C.app is a macOS utility that corrects grammar, punctuation, and style in whatever text is selected in any application, triggered by pressing Command-C three times rather than switching to a separate editor. It works either free using your own OpenAI or Claude API key, or through a paid plan that includes a bundled correction quota. Users can adjust the correction prompt and review a history of past corrections with explanations attached. Company ownership behind the app could not be confirmed from the site itself during this review.
Free when using your own OpenAI or Claude API key; the paid plan is $2.99 a month and includes 8,000 corrections without needing your own key.
Use tool ↗CMD-C's system-wide shortcut avoids the usual grammar-checker friction of copying text into a separate app, and the bring-your-own-API-key option makes it effectively free for anyone who already pays for OpenAI or Claude directly. It's macOS-only and, being a small utility, comes with no visible company behind it to vouch for long-term support.
Watch out: The free option isn't really free if you don't already have an OpenAI or Claude API key, since acquiring one has its own cost.
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