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dotPeek vs ILSpy: catalog facts
dotPeek	ILSpy

Best for: .NET developers inspecting or debugging assemblies without source code	Best for: Browse and decompile .NET assemblies
Free Free of charge; also included in the paid dotUltimate bundle.	Free The open-source software is available without a license fee. Hosting, hardware and external services are separate.
Windows	Windows, macOS, Linux
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	Provides a graphical way to inspect reconstructed code.
Windows only Closed source Limited to .NET assemblies	Decompiled output may differ from the original source.
Downloadable app	Downloadable app
Not open source	Open source
License: Proprietary	License: MIT
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 dotPeek jetbrains.com/decompiler Catalog checked October 2, 2026	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

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