Cmux Remote

See your terminal in true color, select and copy output, upload photos or files, and preview recent images — all through your private Tailscale connection.

Cmux Remote is a private remote-control client for the cmux terminal multiplexer running on your own computer. Connect over your Tailscale network — your traffic never touches a third-party relay.

WHAT IT IS

Cmux (https://cmux.com) is a modern terminal multiplexer with native splits, workspaces, and rich integrations for AI agents like Claude Code, Codex, omx, and Cursor. Cmux Remote mirrors the cmux surface you choose, lets you type into it, send keys, manage workspaces, upload photos and documents, preview images, and receive notifications — all from this mobile app.

WHO IT IS FOR

• Developers who run long-lived agents such as Claude Code, Codex, and omx and want to check or control them away from their desk
• People who access their own development machine remotely and want a focused terminal experience
• Anyone already using Tailscale and looking for a private way to reach their terminal

HOW IT WORKS

1. Install the open-source cmux-relay binary on the computer that runs cmux.
2. Make sure that computer is connected to Tailscale.
3. Open this app, enter the computer’s Tailscale hostname, and tap Connect.
4. Your cmux workspaces appear. Select a surface and start working.

The relay communicates directly with cmux through its local Unix socket. This app communicates with the relay over a WireGuard-encrypted Tailscale tunnel. Nothing leaves your private network.

FEATURES

• Performance-tuned live mirroring of cmux terminal surfaces with Korean/CJK width support, an opaque-black viewport, and ANSI truecolor
• Long-press drag selection with adjustable handles and one-tap copy
• Keyboard accessory controls for Esc, Enter, Tab, arrows, Ctrl-C, other Ctrl combinations, /new, and Space
• Keyboard-safe command layout with automatic dismissal after sending and an inline scroll-to-bottom control
• Paste text and securely upload photos or documents to Downloads/cmux-remote
• Browse recent uploads and terminal-visible files with image thumbnails and a full-screen zoom viewer
• Local notifications and a native Inbox for cmux events and AI-agent needs-input prompts
• Create, rename, and close workspaces and switch between multiple surfaces
• Connected computer battery status when provided by the relay
• Pinch-to-zoom terminal font sizing
• Demo Mode with populated sample data so you can try the app before setting up a relay

PRIVACY

No analytics. No advertising. No third-party tracking SDKs. The bearer token issued by your relay is stored only in secure credential storage on your device.

Source code and privacy details: https://github.com/NewTurn2017/cmux-remote

REQUIREMENTS

• A personal computer running cmux 0.64 or later and cmux-relay
• Both devices signed in to the same Tailscale tailnet
• iOS 17 or later

Cmux Remote is open source under the MIT license. Issues and pull requests are welcome.