Local AI autocomplete for writers: Cotypist and Cotabby
While you type, the computer guesses your next word. Press tab to accept it. The more you use it, the better it gets. By computer, I mean a small AI model running entirely on your machine. Private, fast, and free of API costs.
This can feel like actual magic. I’ve been chasing something like this since I first saw autocomplete in code editors. I even tried using Cursor for prose, pulled my own context via MCP… and ran out of tokens. There are better options now for Mac users:
Cotypist looks polished and costs $8/month or $72/year.
Cotabby is the free, open-source alternative.
Both apps suggest a local LLM or let you choose: a small Qwen 3, Apple’s built-in model, or Gemma 4 for better suggestions, if your Mac has enough RAM to run it. You can also bring your own model. And you can steer the suggestions by adding custom instructions and tell the apps how many words they should suggest, from 2-4 to 10 and more.
Both apps are a bit hacky in how they locate the cursor on your screen and overlay suggestions. With some apps, this can break the layout. I’ve seen at least two more recent entries to this new category of auto-complete apps, and there will certainly be more. Until Apple builds something like this right into the OS.