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dnSpyEx vs dotPeek: catalog facts
dnSpyEx	dotPeek
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Best for: Reverse engineers and developers inspecting or debugging .NET programs	Best for: .NET developers inspecting or debugging assemblies without source code
Free Free and open source.	Free Free of charge; also included in the paid dotUltimate bundle.
Windows	Windows
Decompiler, debugger and assembly editor in one tool Debugs .NET assemblies without their source code Maintained continuation of a widely used tool	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
Unofficial fork of the original project Windows only	Windows only Closed source Limited to .NET assemblies
Downloadable app	Downloadable app
Open source	Not open source
License: GPL-3.0	License: Proprietary
No account needed	Not stated if an account is needed
Offline features available	Not stated if it works offline
Official website Full listing and sources Sources for dnSpyEx github.com/dnSpyEx/dnSpy Catalog checked September 24, 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.

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