BepInEx review
A free, open-source loader for multi-framework desktop game modding.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
BepInEx is an open-source framework for loading plugins and modifying desktop games built with Unity Mono, Unity IL2CPP, .NET, XNA, FNA, and MonoGame technologies. It is aimed at game mod developers and players installing supported plugins locally on Windows, macOS, and Linux. The framework combines plugin loading with runtime method patching through Harmony, in-memory assembly patching, built-in configuration, and logging for plugins and the framework itself.
Its main strength is breadth across game technologies and mod-loader needs. BepInEx uses injection for mod loading and includes support for both Unity Mono and IL2CPP games, alongside .NET-related frameworks such as XNA, FNA, and MonoGame. Compatibility with several other mod-loader frameworks also makes it relevant where an existing mod setup spans more than one framework. Dependency-aware plugin ordering adds control for installations where load sequence matters, rather than treating every plugin as an isolated file.
The framework is free and open source across three desktop platforms, with no paid tiers separating core features. Its configuration and logging features give plugin developers practical building blocks, while Harmony patching and assembly patching provide deeper ways to alter runtime behavior. BepInEx is a strong fit for users who need one framework across varied Unity and .NET game environments. It is less suitable for anyone seeking a platform-independent loader, a managed service for distributing mods, or built-in AI capabilities.
BepInEx pros and cons
- Where it wins
- Supports Unity Mono, IL2CPP, .NET, XNA, FNA, and MonoGame
- Combines plugin loading, Harmony patching, configuration, and logging
- Dependency-aware ordering helps manage plugin load sequences
- Where it doesn't
- Injection-based loading depends on compatible desktop game installations
- Unity Mono has stable releases, while broader framework coverage varies
- No built-in AI features
BepInEx fact sheet, pricing and score →
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