apphash.io helps Cosmos SDK chain developers debug app hash mismatches (state non-determinism) by making application state divergence visible. When a mismatch happens, the chain halts, but finding where state diverged usually requires manual RPC diffing and log analysis. apphash.io shows which SDK module produced a different state root and the exact key-value differences inside that module across nodes, turning blind debugging into a concrete, inspectable problem.

Hi everyone — I’m the developer behind apphash.io. I built this after repeatedly running into app hash mismatches while developing and operating Cosmos SDK–based L1 chains. The hardest part was never fixing the bug itself, but figuring out where application state actually diverged when all nodes agreed on the same block and transactions. apphash.io focuses on making that divergence explicit by visualizing module-level state roots and detailed key-value differences across nodes. It’s currently being used on real chains and has already helped resolve app hash mismatches that would otherwise have taken days to debug. Happy to answer questions, hear feedback, or discuss edge cases you’ve seen around deterministic execution.

AppHash

Real-time state non-determinism & consensus monitoring

Real-time state non-determinism & consensus monitoring

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