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BitFun

Maker: GCWing License: MIT Stars: 1.8k First released: 2026-02-02 Language: Rust

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About

BitFun pairs a Rust agent runtime with a Tauri desktop app, positioning itself around the idea that a chat transcript is the wrong interface for many agent tasks. When the agent builds a chart, board, form, or panel, that interface persists as a mini app bound to the conversation's live state, and a public gallery hosts shareable examples. The runtime is tuned for long-horizon work: byte-stable prompt assembly keeps KV-cache hit rates at 98.67% on SWE-Bench-Pro runs, and a resident flashgrep index speeds repository search roughly 36x on Chromium-scale codebases. Customization runs through four tiers — custom agents, MCP/skills/hooks, mini apps, and source-level changes — with Codex-compatible hooks so existing scripts work unmodified. Multi-device use runs through a self-hosted, zero-knowledge relay (Argon2id and AES-GCM client-side key derivation), keeping sessions off vendor infrastructure. The project is MIT-licensed, spare-time research rather than a commercial product, and actively developed with 3,400+ commits.