Guide
How to use Codex from your phone
Compare the official ChatGPT mobile route with other ways to follow and continue a Codex session from your phone. Each option explains where the session runs and what trade-off it makes.
Reviewed August 26, 2026. Sources: OpenAI Remote Connections docs · Happy Coder README
Ways to use Codex from your phone
Option 1
Codex in the ChatGPT App
How it works Codex Remote Control is part of the ChatGPT app on iOS and Android. Pair the phone with ChatGPT desktop on macOS or Windows by QR code; repository files, tools, and skills stay on that host.
Trade-off The host must stay awake, and access may depend on your account, workspace, or admin settings.
Best for Codex-only workflows where you already use the ChatGPT desktop app on macOS or Windows.
Visit Codex in the ChatGPT App → Compare with Sesori →Option 2
Happy Coder
How it works Happy Coder is a free, MIT-licensed client for Claude Code, Codex, OpenClaw, and ACP-compatible agents. Its public README documents end-to-end encryption for session traffic.
Trade-off It is community-driven and supports a narrower named set of agents than Sesori.
Best for Free, fully open-source mobile control.
Visit Happy Coder →Option 3
CodeAgent Mobile
How it works CodeAgent Mobile connects through an IDE plugin or CLI and offers native iOS and Android apps. Its broader workflow includes tickets, chat, pull requests, and team handoffs.
Trade-off Its product page does not document the same phone-to-local-Bridge end-to-end encryption boundary as Sesori.
Best for Teams that want Codex access alongside issue, chat, and pull-request workflows.
Visit CodeAgent Mobile →Option 4
Remodex
How it works Remodex is an open-source iPhone companion for Codex and other agents running on your Mac. Its listing includes end-to-end encryption, QR pairing, Git actions, voice input, and an SSH terminal.
Trade-off It is designed for iPhone and a local Mac runtime.
Best for iPhone users who want an open-source companion for a local Mac runtime.
Visit Remodex →Option 5
Sesori
How it works Sesori connects iOS and Android to a Codex session on your computer through a local Bridge. It also supports OpenCode, Cursor, Claude Code, Pi, OMP, and Hermes. Ordinary app-to-Bridge payloads are end-to-end encrypted; review diffs and respond to available permission requests where the selected assistant exposes them.
Trade-off Your computer must remain running; coding assistants, model providers, and optional hosted features retain their own data paths.
Best for Developers who want one mobile cockpit across OpenCode, Codex, Cursor, Claude Code, Pi, OMP, and Hermes rather than a separate client per assistant.
Read Sesori’s setup guide →