what is mobius fr?

Mobius is a macOS menu bar app that switches between multiple Claude and Codex accounts with a single click. If you use Claude Code, Claude Desktop, or the Codex command line tool with more than one subscription, such as a personal account and a work account, Mobius removes the need to manually log out and log back in every time you hit your usage limit. It automatically falls back to the next account on your list when one runs out, and automatically switches back to your main account once its limit resets. Clicking the infinity icon in the menu bar opens a small window showing tabs for all providers, Claude, and Codex separately, with each account shown as a card displaying a usage gauge and the time left until it resets. Clicking a card switches to that account instantly without needing to sign in again. You set which account is primary and which are fallback accounts, and fallback accounts can be reordered by dragging. The menu bar icon itself changes color to show whether you are on your primary account, a fallback account, or have exhausted every account. Mobius supports switching Claude Code CLI sessions across claude.ai subscription accounts, personal or business, and OpenAI Codex CLI sessions logged in through a ChatGPT subscription, with Claude Desktop switching included as an experimental feature. It does not support Console or API key based access, Bedrock, or Vertex accounts, and requires macOS 14 or later along with the relevant CLI tool installed. The README notes that using more than one personal account just to raise your usage limit may violate the underlying service's terms, and warns that Mobius is not responsible for any account restrictions that result from that. Detection of usage limits works entirely by reading local session log files rather than calling any server, so the app does not add extra network traffic that could look suspicious to the account provider. The only network calls it makes are for displaying the usage gauge, for login, and for a once a day update check, all of which can be turned off. A command line tool called mobius is also available for switching accounts from a terminal. The app is open source and distributed under the MIT license.