FuJacob/cotabby

Cotabby is local AI autocomplete for your entire Mac. Open source. On device. Everywhere you type.

What it solves

Cotabby provides system-wide AI-powered autocomplete for macOS, allowing users to receive inline text suggestions in almost any text field without relying on cloud-based services or telemetry.

How it works

It functions as a background application that monitors typing via macOS Accessibility and Input Monitoring permissions. It generates suggestions using one of three engines: Apple Intelligence (built-in), a local Open Source engine powered by llama.cpp (using GGUF base models), or a custom OpenAI-compatible API endpoint. Suggestions appear as "ghost-text" and can be accepted using the Tab key.

Who it’s for

macOS users who want AI writing assistance integrated across all their applications while maintaining strict local-first privacy.

Highlights

  • Local-first privacy: No telemetry, no analytics, and default engines run entirely on-device.
  • Flexible engines: Supports Apple Intelligence, local GGUF models (with custom model support), and remote OpenAI-compatible endpoints.
  • Ghost-text autocomplete: Inline suggestions that can be accepted word-by-word or in full.
  • Additional utilities: Includes emoji autocomplete, inline macros for math and conversions, and one-key autocorrect.

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