Retool 4.0 is the most significant infrastructure change to self-hosted Retool since launch. It introduces the new app builder built on React, with AI-assisted building and a real-time collaborative editing environment. These features are powered by a set of additional services: the agent sandbox, JS executor, MCP server, and app building agent.
Self-hosted Retool 4.0 Stable
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June 11, 2026
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retool