NetWasm
playground.netwasm.com- Category
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Previous survey · No. 2651 ·
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About
NetWasm is an independent .NET compiler, core library and runtime built for WebAssembly. It compiles Roslyn-generated CIL into standalone core WASM or WASI Preview 2 components without CoreCLR or Mono, and a Console.WriteLine(42) release build comes to 82.5 KB including the runtime and a precise garbage collector. It avoids Microsoft's CoreLib and reflection to keep output small, and a browser playground compiles code entirely client-side.
At a glance
NetWasm Playground compiles and runs C# as WebAssembly in a browser. It is worth opening if you want to try a small language example before setting up a local project.
Good fit
C# developers testing a short synthetic snippet and looking for a compiler diagnostic.
Consider something else when
Use your normal .NET build when you need to verify native libraries, project dependencies or target-specific behavior.
Start here
Run a small snippet with a known output, then introduce a type error and inspect the diagnostic. Keep the example independent of your work code.
Cost and requirements
Public browser playground. The publisher describes C# 15 support and browser-side compilation.
Limits to know
The site describes compilation as single-threaded. A successful snippet says little about a larger project with native dependencies or different runtime requirements.
Sources checked 2026-11-05. Source-based assessment.
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