An app-building agent combining an editable design canvas, coordinated parallel tasks, and collaboration across web, mobile, and other project artifacts.
Replit introduced Agent 4 on March 11, 2026 to make building software more collaborative and give creators more control while an agent works. Agent 3 had emphasized autonomy: running, testing and fixing work independently. Agent 4 built on that foundation with a design canvas, parallel tasks and a shared project workflow. The launch brought design variants, applications and other artifacts into one environment, allowing people to plan or edit while tasks continued in the background. Replit also disclosed that Agent 4 itself was built using Agent 3, making the release an example of the development workflow it was trying to enable.
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