# A T3 Code alternative that runs Claude Code itself T3 Code calls itself [an agent harness control surface](https://github.com/pingdotgg/t3code): a desktop app, a web app and phone apps for the coding agents you've installed, open source under the [MIT licence](https://github.com/pingdotgg/t3code/blob/main/docs/user/faq.md). Moontors is an agentic development environment (ADE) that runs Claude Code, Codex, Gemini CLI and Grok Build side by side, each through its own protocol, every session a live card on one board. ## At a glance | | T3 Code | Moontors | | ---------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | -------------------- | | Agents | [Claude Code, Codex, Cursor, Grok Build, OpenCode, Google Antigravity, Pi or Muse Code](https://github.com/pingdotgg/t3code/blob/main/docs/user/faq.md), each installed and signed in on your computer | Claude Code, Codex, Gemini CLI and Grok Build, through each one's own protocol | | Platforms | [macOS, Windows and Linux](https://github.com/pingdotgg/t3code/blob/main/docs/user/install.md); [a web app, and apps for iOS and Android](https://github.com/pingdotgg/t3code), the phone [a remote for your computer](https://github.com/pingdotgg/t3code/blob/main/docs/user/faq.md) | macOS 13+, Windows 10+ (x64), Linux (x86-64); an app for your phone, on [Google Play](https://play.google.com/store/apps/details?id=com.moontors.mobile) for Android, the iPhone app coming soon; the Windows and Linux builds aren't signed yet, and Windows asks before the first open; on Windows 11, Smart App Control, when it's on, blocks unsigned apps, Moontors among them; early preview (0.x) ([Known limits](/docs/known-limits/)) | | Needs | [An installed, signed-in agent](https://github.com/pingdotgg/t3code/blob/main/docs/user/install.md); [a T3 Connect account](https://github.com/pingdotgg/t3code/blob/main/docs/user/remote-access.md) to reach your computer through its relay | Each agent's own sign-in; no Moontors account needed ([Signing in](/docs/sign-in/)) | | Isolation | [A new git worktree or the project's folder](https://github.com/pingdotgg/t3code/blob/main/docs/user/source-control.md), by your default | A git worktree per session, when you want one ([Worktrees](/docs/worktrees/)) | | When the app is closed | [Its server kept running in the background](https://github.com/pingdotgg/t3code/blob/main/docs/user/install.md) by `t3 service install`, on macOS and Linux | Sessions keep working in a background service ([Sessions and the board](/docs/sessions-and-board/)) | | Remote work | [T3 Connect, pairing on your network or tailnet, Tailscale, and SSH](https://github.com/pingdotgg/t3code/blob/main/docs/user/remote-access.md) | Local only | | Licence | [MIT, open source](https://github.com/pingdotgg/t3code/blob/main/docs/user/faq.md) | Free, closed source | | Price | [Free](https://github.com/pingdotgg/t3code/blob/main/docs/user/faq.md) | Free, with no Moontors account needed | ## What each has that the other doesn't T3 Code: - open source, under the [MIT licence](https://github.com/pingdotgg/t3code/blob/main/docs/user/faq.md); - [Cursor, OpenCode, Google Antigravity, Pi and Muse Code](https://github.com/pingdotgg/t3code/blob/main/docs/user/faq.md) as agents; - [pull requests](https://github.com/pingdotgg/t3code/blob/main/docs/user/source-control.md) made, reviewed and merged in the app, on GitHub, GitLab, Bitbucket and more; - agents on other machines, over [SSH, Tailscale or T3 Connect](https://github.com/pingdotgg/t3code/blob/main/docs/user/remote-access.md); - [a web app](https://github.com/pingdotgg/t3code) beside the desktop one. Moontors: - Claude Code itself, the command-line agent as Anthropic ships it, where T3 Code drives Claude through [Anthropic's Agent SDK](https://github.com/pingdotgg/t3code/blob/main/docs/user/faq.md); - every session a live card on one board, its transcript streaming as it works, in sections you make ([Sessions and the board](/docs/sessions-and-board/)); - a Git view with the history graph, staging by hunk, stashes, and merge conflicts resolved side by side ([Git and Files](/docs/diff-and-files/)); - the agents' own settings, MCP servers and skills listed, and switched on and off for Moontors' sessions without editing your files ([Configuration](/docs/configuration/)); - sessions that keep working in a background service after you quit the app, on macOS, Windows and Linux, where T3 Code's [background server](https://github.com/pingdotgg/t3code/blob/main/docs/user/install.md) is set up on macOS and Linux. ## Where T3 Code is the better fit - You want an open-source app. - You use Cursor, OpenCode, Antigravity, Pi or Muse Code as agents. Moontors will support Cursor and OpenCode, but doesn't yet. - You want pull requests made and reviewed in the same app. - Your agents run on other machines, over SSH or Tailscale. ## Questions ### What's the difference between Moontors and T3 Code? Both are free and run several coding agents at once in their own interface, each in a git worktree when you want one, with your sessions on your phone too: T3 Code through [its iOS and Android apps](https://github.com/pingdotgg/t3code). T3 Code lists its threads [in a sidebar](https://github.com/pingdotgg/t3code/blob/main/docs/user/thread-sidebar.md) and runs [more agents](https://github.com/pingdotgg/t3code/blob/main/docs/user/faq.md). Moontors runs Claude Code, Codex, Gemini CLI and Grok Build themselves, as their vendors ship them, with every session a live card on one board, and keeps the sessions working in a background service on macOS, Windows and Linux. ### Is T3 Code free? Yes, and so is Moontors. [T3 Code's FAQ](https://github.com/pingdotgg/t3code/blob/main/docs/user/faq.md) says there's no way to pay for it: you bring your own subscriptions. Moontors needs no Moontors account either, and each agent signs in its own way ([Signing in](/docs/sign-in/)), a Claude subscription or a ChatGPT sign-in you already have included. ### Is Moontors open source? No. Moontors is free, but closed source. T3 Code is open source, under the [MIT licence](https://github.com/pingdotgg/t3code/blob/main/docs/user/faq.md). ### Is there an app for my phone? Yes, for both. Moontors has an app for your phone that follows and answers your computer's own sessions over a link encrypted end to end, which no Moontors server can read, on [Google Play](https://play.google.com/store/apps/details?id=com.moontors.mobile) for Android, the iPhone app coming soon. T3 Code has [apps for iOS and Android](https://github.com/pingdotgg/t3code), [a remote for your computer](https://github.com/pingdotgg/t3code/blob/main/docs/user/faq.md), reached through T3 Connect or a pairing link. ### Does Moontors run Claude Code itself? Yes. Moontors runs Claude Code's own command-line agent, as Anthropic ships it, on your Claude subscription, with your own settings, skills and MCP servers, and Codex, Gemini CLI and Grok Build the same way. T3 Code [drives Claude through Anthropic's Agent SDK](https://github.com/pingdotgg/t3code/blob/main/docs/user/faq.md). ## Related - [What is an agentic development environment (ADE)?](/docs/what-is-an-ade/) - [How to run several Claude Code sessions in parallel](/docs/how-to/run-claude-code-sessions-in-parallel/) - [How to use your coding agents together](/docs/how-to/claude-code-codex-and-gemini-cli-together/)