Dylibso is a technology company that provides observability tools for WebAssembly (Wasm) code. Its Observe SDK enables continuous monitoring of WebAssembly code as it executes within a runtime. They offer solutions for running Wasm in serverless environments, creating plug-ins, integrating with browsers, and executing smart contracts on Web3 and blockchain networks. Dylibso also develops the open-source Extism plug-in system and the Modsurfer diagnostics application.