Google Antigravity Review: Do Its Agents Ship Working Apps?

Google Antigravity is an agent-first development platform available through a desktop app, CLI, editor extensions, an IDE, and an SDK, enabling Gemini-powered agents to plan tasks, edit project files, run commands, and optionally use browser tools. In tests involving six small web applications built by Gemini 3.8 Flash and Gemini 4 Argon, all builds passed independent Chrome-based acceptance checks, while Argon completed tasks substantially faster and with fewer tokens than Flash. However, the agents’ default self-verification relied on Node scripts and mock DOMs rather than real browser testing, meaning their reported success did not independently demonstrate rendered UI behavior. The review also identifies operational concerns including unpublished and capacity-dependent quotas, headless CLI runs that can report success after permission-denied commands, and sandbox or permission configurations that require careful planning. Antigravity is presented as a capable option for well-defined, multi-file development work, particularly for teams using supported editors or Google Cloud enterprise controls, but its output should be validated with independent acceptance tests, especially for UI-heavy applications and CI workflows.

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