I built the RealWorld app in Lean 4
I built RealWorld, the reference full-stack app with official test suites, entirely in Lean 4. Can it be done? Yes. Is it ready for production? Somewhat. Can it be made correct by construction? Partly. It can certainly be made more robust than the average full-stack app, though.
Summary
The RealWorld app has been developed using Lean 4, demonstrating the potential for creating a full-stack application with a focus on correctness and robustness. The article discusses its current state, production readiness, and how it compares to typical applications in terms of reliability.
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