dnSpyEx

Free plan LinuxWindows

What dnSpyEx is

dnSpyEx is a free, GPLv3-licensed debugger and .NET assembly editor for working with assemblies without source code. It can debug .NET Framework, .NET, and Unity game assemblies, with breakpoints, tracepoints, conditional breakpoints, and multiple-process debugging. Editing covers metadata and methods or classes in C# and Visual Basic, along with low-level IL method bodies. The project lists C# and Visual Basic decompilers based on the ILSpy engine, plus BAML decompilation and disassembly. Users can search assemblies, analyze class and method usage, find callers, bookmark items, and export to a project. A public API supports extensions, and a C# Interactive window can control or script dnSpyEx. The releases page lists v6.6.0 as the latest stable release and notes a .NET 10 distribution. Linux use is described through Wine compatibility adjustments, rather than native Linux support. Dynamic methods cannot be debugged because of CLR limitations. The project says Unity game debugging also requires its dnSpyEx Unity Mono repository.

Who it suits

dnSpyEx suits developers analyzing or editing .NET assemblies, including those working with C#, Visual Basic, or IL. Linux users should note that the described route is through Wine, not native Linux support.

What it does well

Debugs .NET Framework, .NET, and Unity assemblies
Edits C#, Visual Basic, and low-level IL
Includes decompilers, disassembly, and assembly analysis
Free and GPLv3-licensed

What to know first

Dynamic methods cannot be debugged
Linux use is through Wine, not native support
Unity game debugging also requires the Unity Mono repository

Limits

The free plan is listed as free. Dynamic methods cannot be debugged because of CLR limitations; Unity debugging requires the separate dnSpyEx Unity Mono repository.

Plans

Plan	Billed and limits	Price
dnSpyEx	GPLv3-licensed · Latest stable release and beta builds available	Free

As github.com lists them, read 4 Oct 2026. The maker's own page has the final word.

Getting started

Open the dnSpyEx project website on GitHub.
Choose a release or beta build from the releases page.
Use the Windows distribution, or run dnSpy on Linux through Wine.
For Unity game debugging, also obtain the dnSpyEx Unity Mono repository.

Verdict

dnSpyEx combines debugging, decompilation, editing, and assembly analysis at no cost. Its dynamic-method limitation and Wine-based Linux use are important constraints.

Questions

How much does dnSpyEx cost?

The listed plan is free, and the software is licensed under GPLv3.

Which platforms does dnSpyEx support?

The target platforms are Windows and Linux via Wine. The release notes describe Wine compatibility adjustments for Linux.

What languages can it work with?

The listed languages are C#, Visual Basic, and IL.

Can dnSpyEx debug Unity games?

It can debug Unity game assemblies. The project says the dnSpyEx Unity Mono repository is also needed.

Can I extend or script dnSpyEx?

A public API supports extensions, and the C# Interactive window can control or script the application.

What is the latest stable release listed?

The releases page lists v6.6.0 as the latest stable release, including a .NET 10 distribution.

Facts from dnSpyEx's own pages

Analysis tools: Features include searching assemblies, analyzing class and method usage, finding callers, bookmarks, and exporting to a project. · github.com, 4 Oct 2026
Assembly editing: It supports editing metadata and methods or classes in C# and Visual Basic, as well as low-level IL method-body editing. · github.com, 4 Oct 2026
Current release: The releases page lists v6.6.0 as the latest stable release and says the release adds a .NET 10 distribution. · github.com, 4 Oct 2026
Debugging: It can debug .NET Framework, .NET, and Unity game assemblies, with breakpoints, tracepoints, conditional breakpoints, and multiple-process debugging. · github.com, 4 Oct 2026
Decompilation: The project lists C# and Visual Basic decompilers using the ILSpy decompiler engine, plus a BAML decompiler and disassembler. · github.com, 4 Oct 2026
Integrations: To debug Unity games, the project says the dnSpyEx Unity Mono repository is also needed. · github.com, 4 Oct 2026
License: The repository states that dnSpy is licensed under GPLv3. · github.com, 4 Oct 2026
Limits: The project notes that dynamic methods cannot be debugged because of CLR limitations. · github.com, 4 Oct 2026
Maintainer support: The v6.6.0 release notes direct users of third-party extensions to their extension developers for help with extension issues. · github.com, 4 Oct 2026
Platform support: The v6.6.0 notes describe Windows 11 Snap Layout support and Wine compatibility adjustments for running dnSpy on Linux; they do not describe native Linux support. · github.com, 4 Oct 2026
Purpose: dnSpyEx is an unofficial continuation of dnSpy, a debugger and .NET assembly editor for working with assemblies without source code. · github.com, 4 Oct 2026
Scripting and extensions: A public API supports extensions, and the C# Interactive window can be used to control or script dnSpy. · github.com, 4 Oct 2026
Security and integrity: The v6.6.0 release lists SHA-256 hashes for its ZIP distributions and says the release commit was signed with a verified committer signature. · github.com, 4 Oct 2026