Antigravity alternative: your own Claude Code and Codex in one native window
Google Antigravity is an agent-first platform on one harness: an IDE with an Agent Manager, a desktop app that runs local agents in parallel with projects and scheduled messages, a CLI with background subagents, a Python SDK, and artifacts such as task lists, screenshots and recordings that agents hand back as evidence. It's free for individuals, built around Gemini, and signed in with a Google account.
omux is one small window for the agents you already chose. It runs the real Claude Code and Codex terminals side by side, reads their own signals for status, and puts Allow and Deny in the sidebar. No account, no quotas of its own, nothing to learn beyond the agents you use. This page compares the two shapes fairly.
- 5 MBnative Swift app, no Electron
- 0accounts, credits or telemetry
- 6sessions side by side per project
- MITfree and open source
Where the agent lives
working needs you done
Side by side
| omux | Antigravity | |
|---|---|---|
| What it is | A session manager for Claude Code and Codex | An agent platform: IDE, app, CLI and SDK on one harness |
| Runs on | macOS | macOS, Windows and Linux |
| Account | ✕ | Google account |
| Whose agent | Claude Code and Codex, with their own logins | Google's harness, built around Gemini models |
| Many agents at once | ✓ sessions under projects, split panes per project | ✓ the Agent Manager and the app run local agents in parallel |
| Agent status | Working, needs you, done, from the agents' own signals | An inbox of agent runs with artifacts to review |
| Answer a permission prompt | Allow and Deny from the sidebar | In the agent's thread |
| Browser | A browser panel for you; agents don't drive it | ✓ browser-in-the-loop agents for frontend work |
| Artifacts and verification | Changes panel with review notes sent to the agent | Agents produce task lists, screenshots and recordings |
| Scheduled agents | ✕ | ✓ recurring messages in the app |
| Conversations after a restart | Each session resumes its exact conversation | Conversations persist in the app |
| Worktrees and pull requests | One worktree per session, PR status, merge and clean up | Workspaces; git through the IDE |
| Editing code | ✕ | A full IDE, forked from VS Code |
| Price and license | Free, MIT | Free for individuals with quotas; paid Google AI plans raise them; proprietary |
See omux in 37 seconds
Pick Antigravity if
- You want Gemini and Google's harness, with an IDE, an app, a CLI and an SDK that share one brain.
- You want agents that drive a browser and hand back screenshots and recordings as proof.
- You want scheduled, recurring agent runs.
Pick omux if
- You want to keep Claude Code and Codex exactly as they are, with their own logins and plans.
- You don't want a Google account or another set of quotas between you and your agents.
- You prefer a 5 MB native window with real terminals to a platform.
What omux does for every session
- Projects with sessions under them, in a sidebar
- Shows whether each agent is working, needs you or is done
- Allow or Deny an agent's permission request without switching to it
- Lists a session's subagents and opens their transcripts
- Resumes each Claude Code and Codex conversation after a relaunch
- Git worktree per session, with pull request status and merge
- Files, Changes (diff with review notes) and Browser panels
- Claude and Codex plan usage limits in the sidebar
- Split panes: up to six sessions side by side per project, layouts saved
- An omux command line: list, status, send, new, close and wait on sessions
- macOS notifications with sound
Questions
Can omux run Antigravity?
Not as an agent session. omux integrates with Claude Code and Codex. A plain shell session in omux can run the Antigravity CLI, but without status, permissions or subagents.
Does omux need an account?
No. Only the agents do: Claude Code and Codex sign in on their own, and omux never sees those credentials.
Is omux free?
Yes. MIT-licensed, no paid tier, no credits.
Also compared: Terminal alternative, tmux alternative, cmux alternative, Warp alternative, herdr alternative, T3 Code alternative, VS Code alternative, Cursor alternative, Devin alternative. Facts about Antigravity come from its public documentation as of 2026-11-02; if something is out of date, open an issue.