Cotypist

Cotypist is a Mac autocomplete app that predicts your next words inline across everyday writing apps. Its official page emphasizes local Apple Silicon processing, accepting suggestions with Tab, learning a user’s vocabulary and phrasing, and helping with email, Slack, support replies, prompts, documents, and social posts.

• System-wide writing assist — works inline in Mac text fields instead of requiring a separate chat prompt • Local processing — official copy says predictions happen on the Mac rather than in the cloud • Style adaptation — learns vocabulary, names, and phrasing from the user’s writing • Flow-preserving controls — press Tab to accept the next word or line, or keep typing to reject and update suggestions • Practical writing coverage — official examples include email, Slack, support replies, AI prompts, novels, campaign copy, social posts, and documentation