Compare software

ILSpy vs dotPeek: catalog facts
ILSpy	dotPeek

Best for: Browse and decompile .NET assemblies	Best for: .NET developers inspecting or debugging assemblies without source code
Free The open-source software is available without a license fee. Hosting, hardware and external services are separate.	Free Free of charge; also included in the paid dotUltimate bundle.
Windows, macOS, Linux	Windows
Provides a graphical way to inspect reconstructed code.	Decompiles .NET assemblies to C# or IL Exports decompiled code as a Visual Studio project Can serve symbols to the Visual Studio debugger ReSharper-style navigation and find usages
Decompiled output may differ from the original source.	Windows only Closed source Limited to .NET assemblies
Downloadable app	Downloadable app
Open source	Not open source
License: MIT	License: Proprietary
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Sources for ILSpy github.com/icsharpcode/ILSpy github.com/icsharpcode/ILSpy/blob/master/LICENSE Catalog checked September 22, 2026	Official website Full listing and sources Sources for dotPeek jetbrains.com/decompiler Catalog checked October 2, 2026

“Not stated” means we have not confirmed it. Features can vary by device and plan.