Xtend is an iPhone and iPad app that pairs with a free macOS menu bar companion. It gives you your actual Mac development environment on your phone, wherever you are.
What it does:
The iOS Simulator, live and touchable. The Simulator running on your Mac is mirrored to your phone, and taps, swipes and the keyboard go back the other way. You test on a phone-shaped screen, with your finger.
Xcode builds, installed on the real device. Kick off a build from the phone, watch it stream, read the errors, and install the result onto the real device in your hand, not just the Simulator. LLDB is there when the build was the easy part.
Agent sessions. Claude Code, Codex and Gemini run on your Mac, and you drive them from your phone in a native chat UI. Push notifications arrive when an agent needs your permission or finishes its turn, and your answer goes back to the agent, so nothing runs unattended that you did not approve.
A real terminal. Not a chat box that shells out. A proper PTY, so vim, tmux, htop and the agent CLIs all behave the way they do on your Mac, including resizing.
Everything runs over a direct WebRTC connection between your phone and your Mac. There is no VPN or Tailscale to set up, it works from anywhere including cellular, and your code and screen never go through a server.
There is a real iPad adaptation, usable as a full workspace.
Xtend is free to try, with a monthly usage budget that costs nothing. Premium is $4.99/month with a one-week free trial. Requires iOS 18.2 or later and macOS 15.2 or later.