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About BitFun
BitFun is a desktop AI agent that writes code, produces documents, and drives your desktop through a Rust runtime with Agentic Mini Apps and a self-hostable device-sync relay. It runs on Windows, macOS, and Linux and is model-agnostic, so you bring your own AI model.
Updated 8/6/2026
Key Features
- Agentic Mini Apps — each task gets its own interface (chart, board, form, panel) with a conversation bound to that interface's live state
- Self-hosted multi-device control — login, cross-device session sync, and remote device control through a zero-knowledge relay you deploy
- Coding — plan, edit, test, and commit inside real Git repositories with Agentic, Plan, Debug, and Deep Review modes
- Office work — research, writing, presentations, meeting notes, and reports
- Desktop execution — drives the browser, terminal, desktop apps, filesystem, and remote workspaces
- Four-tier customization — Custom Agents, MCP/Skills/Hooks, Mini Apps, and source-level changes
- Performance — 98.67% average KV cache hit rate and flashgrep for Chromium-scale repo search about 36x faster
- Cross-platform and model-agnostic — Windows, macOS, and Linux; you choose what it runs on
Pricing Structure
- Free — $0 — Open-source (MIT); bring your own model key for LLM use.
Why People Use It
BitFun gives every task its own interface instead of forcing everything through one chat box, so you work with what's on screen rather than re-describing it. Because it's self-hostable, model-agnostic, and open source, builders who want a fast, private, and deeply customizable desktop agent choose it over cloud-only assistants.
See BitFun in Action
