cmux

What is cmux?

cmux is a native macOS terminal for developers who run several command-line coding agents at once. It uses the Ghostty rendering library, adds vertical tabs that show git branch, working directory and ports, and lights up panes with notification rings when an agent needs attention. Any agent that runs in a terminal works, including Claude Code, Codex, OpenCode, Gemini CLI, Aider and Cline, using your own keys. A CLI and socket API let you script workspaces, splits and an in-app browser pane, and sessions are restored after a restart. Paid plans add Cloud VMs, persistent Linux machines where agents can clone repositories, run commands and open pull requests without touching your Mac, plus an iOS companion app. The terminal itself is free and GPL-licensed. Pro costs $50/mo, or $40/mo billed yearly, Max is $200/mo, and Team is $60/user/mo.

Use cases

• Run several coding agents in parallel
• Get alerted when an agent needs input
• Script terminal workspaces and splits
• Run agents on isolated cloud VMs
• Drive a browser pane from an agent
• Monitor terminals from an iPhone

Who it's for

• Software developers
• Teams using coding agents
• Engineering organisations

Why use cmux

• See every agent in a run as its own pane instead of hidden background processes.
• Notifications tell you which agent needs a decision, so you can work on something else meanwhile.
• The terminal and local agents stay free, and you bring your own API keys.
• Cloud VMs keep agent work off your laptop and keep their files between sessions.
• Scripting through the CLI and socket API makes repeatable setups possible.

cmux features

• Native macOS app using libghostty for terminal rendering
• Vertical tabs showing git branch, directory, ports and notification text
• Notification rings and badges when an agent needs attention
• Split panes and an in-app browser with a scriptable API
• CLI and Unix socket API for workspaces, input and screen reads
• Session restore for windows, panes, scrollback and agent sessions
• Cloud VMs with checkpoints, forks, pause and resume on paid plans
• SSH workspaces and attach to remote tmux sessions
• iOS companion app in beta that mirrors terminals
• Reusable skills for CLI control and workspace automation

cmux integrations

• Claude Code
• Codex
• OpenCode
• Gemini CLI
• Aider
• Cline
• Goose
• Amp
• Kiro
• Cursor Agent
• Ghostty
• Tailscale

How to get started with cmux

1. Download the macOS app and open it as your terminal.
2. Start a coding agent in any pane, using your own keys.
3. Use vertical tabs, splits and the browser pane to organise multiple workspaces.
4. Watch for notification rings when an agent finishes or asks something.
5. On a paid plan, create a Cloud VM with cmux vm new and run agents there.

cmux limitations

• The free plan does not include Cloud VMs
• Cloud VMs on Pro and Team are capped at 16 GB RAM and 8 vCPU each; larger sizes need Max
• Machines do not pause on their own when idle
• The iOS app is in beta

cmux pricing

Yes, cmux has a free plan. Paid plans start at $40 per month, according to the official pricing page on 24 Oct 2026.

cmux plans

• Free

  $0/mo

  • Open-source macOS terminal
  • Local CLI agents with your own keys
  • Vertical tabs, splits and socket API
  • Community support

• Pro

  $50/mo

  or $40/mo billed yearly ($480/yr)

  • Cloud VMs: up to 5, sharing 20 vCPUs and 40 GB RAM
  • Unlimited workspaces
  • iOS app and email support

• Max

  $200/mo

  or $160/mo billed yearly ($1,920/yr)

  • Up to 5 Cloud VMs sharing 80 vCPUs and 160 GB RAM
  • Single VM up to 64 GB RAM and 32 vCPU
  • Unlimited workspaces and iOS app

• Team

  $60/user/mo

  • Everything in Pro
  • Centralised billing
  • Priority support

• Enterprise

  Custom

  • Self-hosted cloud execution
  • SSO and SAML sign-in
  • Audit logs
  • SOC 2 and an SLA

Plans as listed on the official pricing page on 24 Oct 2026. Prices can change and may vary by country or exclude tax. Check the official pricing page.

cmux alternatives

The main cmux alternatives listed on Debuly are Warp, Amp, Codex Infinity, Cursor, Google Antigravity and Open SWE. The table compares pricing and platforms; order is A–Z.

1. 

   Amp

   Coding agent that runs in hosted cloud orbs or on your own machine, with a free Hobby tier and a $20 monthly plan.

   CodingAutomation and agentsDeveloper platforms
   FreemiumVisit Amp (official site)
2. 

   Codex Infinity

   Cloud platform that runs autonomous coding agents, with your choice of agent harness and model, GitHub triggers and an API.

   CodingAutomation and agentsDeveloper platforms
   FreemiumVisit Codex Infinity (official site)
3. 

   Cursor

   AI code editor and coding agent with cloud agents, Bugbot code review and multi-provider models, sold with Grok and X plans.

   CodingAutomation and agentsDeveloper platforms
   FreemiumVisit Cursor (official site)
4. 

   Google Antigravity

   Google's agent-first development platform with a desktop app, CLI, IDE extensions and Python SDK for running coding agents.

   CodingAutomation and agentsDeveloper platforms
   FreemiumVisit Google Antigravity (official site)
5. 

   Open SWE

   LangChain's open-source framework for building internal asynchronous coding agents that plan, code, test and open pull requests.

   CodingAutomation and agentsDeveloper platforms
   Open sourceVisit Open SWE (official site)
6. 

   Warp

   Terminal with a built-in coding agent, shared team workspace and cloud agents, plus factory-as-code for automating software work.

   CodingDeveloper platformsAutomation and agents
   FreemiumVisit Warp (official site)

cmux FAQ

Sources & verification

Facts on this page come from the official sources below, each with the date we read it. Written by Debuly; the vendor did not review this page.

Image credits

• Logo: from cmux.com · fetched 24 Oct 2026 · Vendor trademark, used only to identify the product; removed on request
• Cover: none collected yet, so a generated tile is shown.

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