Codex now has more than 4 million weekly users. Before this, it mostly ran on your computer: you opened Codex on a Mac, and it read code, ran commands, and edited files in the background. Now your phone can step into that loop. You are not writing code on a phone. You are watching what Codex is doing, giving approvals, redirecting it, and checking whether the work is done.

Here is the practical scenario: Codex is fixing a bug. It reads files, tries to reproduce the issue, runs tests, and finds two possible fixes. It pauses and asks you to choose. You open your phone on the train, read the tradeoff, choose one path, and Codex keeps going. You did not need to sit in front of the computer the whole time.

In February, Anthropic released Remote Control for Claude Code, letting users monitor Claude Code work from a phone. The logic is the same: AI coding tasks are getting longer, and you cannot keep staring at a terminal. You need a mobile entry point to follow progress and step in when needed.

The fight is not really about whose mobile UI looks better. It is about whose coding agent becomes the developer's main working partner. Remote control is just the latest chapter.