ILSpy

Health v2 · maintenance only

Adoption not part of the score

25954 stars · 3698 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

ILSpy is an open-source, cross-platform .NET assembly browser and decompiler that converts compiled .NET binaries back into readable C# source code. It ships as a desktop GUI built on Avalonia, plus a CLI dotnet tool, editor extensions, and NuGet libraries (ICSharpCode.Decompiler) for embedding decompilation.

Use cases

• decompile a .NET dll back to C# source
• inspect the contents of a compiled .NET assembly
• recover source code when only binaries are available
• generate PDB files from .NET assemblies
• browse and analyze third-party NuGet package internals
• decompile assemblies from the command line in CI
• analyze Unity or Mono game assemblies

When to choose

• you need to read or recover C# code from compiled .NET binaries
• you want a free, open-source alternative to .NET Reflector or dnSpy
• you need cross-platform decompilation on Windows, Linux, or macOS
• you want to embed a decompiler engine in your own tooling via NuGet

When to avoid

• you need to decompile JVM bytecode or native binaries rather than .NET assemblies
• you require debugging or live patching of assemblies (tools like dnSpy are better suited)
• you need obfuscation removal or guaranteed perfect source recovery

Facets

application · maturity active

reverse-engineering developer-tools gui cli parser developer-tools reverse-engineering programming-languages windows cross-platform dotnet cli decompiler dotnet csharp assembly-browser pdb avalonia nuget-library linux macos

Member repositories

For agents

markdown · JSON · MCP: product_card(name="icsharpcode/ILSpy")