ILSpy

6.8easy start · #15 of 73
in Reverse Engineering Tools

Free to practise onyes
Free trialnot on record
Well documentedyes
Runs where you workyes

Runs on Browser, Linux, Mac, Windows.

ILSpy is ranked #15 of 73 in reverse engineering tools on The Geeks Club. It runs on Browser extension, Linux, macOS, Windows. There is a free plan.

ILSpy plans and pricing

All plans

ILSpy Free Open-source software · MIT License github.com · 4 Oct 2026

Compared on reverse engineering tools

Free plan: Yes
Native-code decompilation: No
Bytecode decompilation: Yes
Scripting API: Yes
Plugin support: Yes
License type: free

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The record

Purpose: ILSpy is an open-source, cross-platform .NET assembly browser and decompiler.
Desktop platforms: The desktop UI runs on Windows, Linux, and macOS and is built on Avalonia.
C# decompilation: ILSpy decompiles assemblies to C# and supports whole-project decompilation.
Assembly sources: It can open assemblies from disk, the NuGet feed, running processes, and the GAC, with GAC support limited to Windows.
Navigation and metadata: Features include searching types, methods, and properties; hyperlink navigation; bookmarks; base and derived type navigation; and an assembly metadata explorer.
Additional formats: ILSpy includes a BAML-to-XAML decompiler and support for ReadyToRun binaries for .NET Core.
Integrations: Frontends and related tools include Visual Studio 2022/2026 support, Visual Studio Code extensions, the ilspycmd dotnet tool, PowerShell cmdlets, and NuGet packages.
Extensibility: The desktop application can be extended with plugins.
Privacy: ILSpy says it does not collect personally identifiable information, send user files to third-party services, or use an application performance monitoring service to collect telemetry or metrics.
Security reporting: The project asks that suspected security issues be reported privately by email and says it cannot guarantee a response time, though it strives to respond within one business day.
Supported versions: The security policy supports the latest released version and the latest preview or release-candidate version.
Release: The GitHub releases page lists ILSpy 11.1 as the latest release.
Price from: Free

Where it ranks on The Geeks Club

Best Reverse Engineering Tools in 2026#15 of 73
Best Decompiler Software in 2026#8 of 24

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Sources

github.com/icsharpcode/ILSpy· checked 4 Oct 2026
github.com/icsharpcode/ILSpy/blob/master/SECURITY.· checked 4 Oct 2026
github.com/icsharpcode/ILSpy/releases· checked 4 Oct 2026