Sandbox Relay
Chat with your coding agent
Only for iPhone
Free · Designed for iPhone. Not verified for macOS.
iPhone
Sandbox Relay turns your phone into a client for a coding agent in Docker Sandbox. Send work, watch replies stream in, track token usage, and keep prompts as notes.
For developers who run Claude Code or Codex in Docker Sandbox, Sandbox Relay is the phone client for driving that agent. It is a companion, not a standalone app: it needs a broker you run, with an agent connected behind it.
Kick off a task from the train, check on a long-running job from the couch, or steer the agent while you are away from your desk.
Docker Sandbox runs each agent in its own isolated micro VM. A small broker you self-host sits in the middle: you send work from your phone, the broker passes it to the agent, and the streamed reply comes back. Your infrastructure, your agent. The app is just the remote.
New to this setup? The app's support page explains how it works and what you need to run it.
WHAT YOU CAN DO
- Connect to your broker with a URL and a bearer token. Connections use HTTPS, with plain HTTP allowed only for local-network addresses.
- See every connected agent at a glance, with live online/offline status.
- Send the agent work and watch its reply stream in token by token. Stop a turn mid-stream, or start a fresh thread whenever you want.
- When an agent goes offline, its thread stays readable as history.
- See per-turn input and output token counts when the broker reports them.
- Save reusable prompts as local notes, organised by hierarchical tags like #work/project/feature. Drill down by tag, copy a note straight into a thread, or link a note to the thread it came from. Notes live on your device only; they never touch the broker.
WHAT YOU NEED
- A broker you run, reachable from your phone (over your local network, or remotely through a tunnel or private network you control).
- A coding agent, Claude Code or Codex, running in Docker Sandbox and connected to that broker.
PRIVACY
Sandbox Relay talks only to the broker you configure. Your access token is stored securely on your device and sent only to that broker, to authenticate you; it never goes to the developer or any third party. Your notes stay on your device and are never sent anywhere. No third-party analytics, no account to create. Note that the app streams whatever your agent outputs, verbatim.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
The developer, Eric Boumendil, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Eric Boumendil
- Size
- 34 MB
- Category
- Developer Tools
- Compatibility
Requires iOS 16.4 or later.
- iPhone
Requires iOS 16.4 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
13+
- 13+
- Copyright
- © 2026 Eric Boumendil