rd remote desktop

A tiny remote desktop built for one thing: the lowest latency physically possible. Pure C, no frameworks, a few hundred kilobytes. Windows host and client, Android client, encrypted end to end, works through NAT via this relay.

Download for Windowsinstaller, host + client, v1.0.3 Download for AndroidAPK, sideload

Why it is fast

The GPU reports what changed. Desktop Duplication hands over dirty and move rectangles; a static screen costs zero bytes.
Persistent content-addressed tile cache. Every 64x64 tile you have ever seen stays on your device, keyed by content hash. When it reappears (scroll back, switch windows, redraw) the host sends a 12-byte reference instead of pixels.
Text as text. Console windows are sent as a character grid and rendered locally with your font, not as video.
No queue, ever. Frames are paced by a bandwidth-delay window measured live, so a change reaches your eye in about one round trip.
XOR delta + LZ4, 64x64 tiles, one send per frame, Nagle off, 1 ms timers.

How to use

Install on the PC you want to control and run rd. It shows an ID and a temporary password.
On the other machine (Windows or Android) enter that ID and password. Both sides connect out to this relay, so no port forwarding.
Traffic is encrypted end to end (X25519 + XChaCha20-Poly1305); the relay only forwards ciphertext.

relay v1.0.3 · 0 active sessions · 0 since start · admin