Native and fast
Built in Rust on GPUI, the GPU-accelerated framework behind Zed. No Electron, no lag.
Si runs Claude Code, Codex, Cursor, Grok, Hermes and Pi on your machines. Steer them from one fast native window, on any device you own, live.
Sessions live on your machines. Every device you own can pilot them.
Built in Rust on GPUI, the GPU-accelerated framework behind Zed. No Electron, no lag.
Claude Code, Codex, Cursor, Grok, Hermes and Pi speak stream-json and JSON-RPC into one model.
Start a run on your desktop and follow or steer it from your laptop, iPhone or iPad, live.
A small engine on each device stores sessions on disk. No account or network needed to start.
Sign in only for a synced workspace. An always-on VPS keeps agents working after you close the lid.
Every action is a keystroke away. Jump between sessions, diffs and history without the mouse.
Grab the macOS app above, or run the one-line installer on Linux.
The engine starts immediately and keeps running across reboots. Run si status to check it.
Download the macOS app and open your first session in under a minute.