Cotypist
Autocomplete that lives everywhere on your Mac
Suggestions appear in ghost text as you type; press tab to accept.
System-wide inline autocompletion for macOS. Type in any app — Mail, Notes, Slack, the address bar — and Cotypist offers the rest of your sentence in ghost text. It learns from what you actually write, so completions echo your own phrasing rather than a generic prediction.
The accept rate climbs over the first few days as it picks up names, project codes, and recurring sentence openings. Runs entirely on-device — no cloud calls, no telemetry. Free with a paid tier for advanced dictionaries and per-app shortcuts. macOS 12+.