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RED4ext

docs.red4ext.com

Free plan Windows
Visit docs.red4ext.com
Spec score 8.1 #5 of 26 in Game Mod Loaders

What it is

RED4ext is a free Windows script extender and plugin manager for Cyberpunk 2077. It gives modders access to the game's scripting system so plugins can add features, alter behavior, add scripting functions, or call existing game functions. RED4ext loads plugins only for supported game runtime versions, while also allowing plugins aimed at the latest defined runtime or independent of runtime versions. RED4ext.SDK exposes the scripting virtual machine, native classes and functions, and reversed game structures. Developers can use any toolchain that produces x86-64 output with the __fastcall calling convention, including CMake, Premake, or Visual Studio. Plugins can attach custom game states around game-system availability and are placed in red4ext/plugins. Each plugin receives a logger, with named logs under red4ext/logs. Configuration is TOML stored in red4ext/config.ini, where plugin loading and individual plugins can be disabled. The MIT-licensed project lists v1.30.0 as its latest release.

Spec sheet

Purpose
RED4ext is a script extender for Cyberpunk 2077 that lets modders interact with or extend the game's scripting system.Read 8 Oct 2026 · docs.red4ext.com
License
The GitHub repository lists the project under the MIT license.Read 8 Oct 2026 · github.com
Compatibility
Plugin builds must target x86-64 and use the __fastcall calling convention.Read 8 Oct 2026 · docs.red4ext.com
Configuration
The configuration file is red4ext/config.ini in the game directory and is automatically created with default values when the game starts if missing.Read 8 Oct 2026 · docs.red4ext.com
Developer console
The configuration can enable an external console described as useful for development and can pause the process until a debugger attaches.Read 8 Oct 2026 · docs.red4ext.com
Developer SDK
RED4ext.SDK provides access to the game's scripting VM, creation of native classes and functions, and reversed game structures.Read 8 Oct 2026 · docs.red4ext.com
Game states
Plugins can attach custom game states to run code before or after game systems, such as the scripting system, are available.Read 7 Oct 2026 · docs.red4ext.com
Installation
Installation involves downloading the latest ZIP, extracting it into the game directory, and launching the game.Read 8 Oct 2026 · docs.red4ext.com
Latest release
The latest release page lists v1.30.0 and includes ZIP downloads with SHA256 hashes.Read 8 Oct 2026 · github.com
Logging
Configuration supports global log levels, log flushing, a maximum number of rotated files, and a maximum log file size.Read 8 Oct 2026 · docs.red4ext.com
Platform requirement
The plugin development guide requires x86-64 output and the installation guide directs users to the x64 Visual C++ Redistributable; these pages describe a Windows game installation.Read 7 Oct 2026 · docs.red4ext.com
Plugin compatibility
A plugin can declare the game runtime versions it supports, and RED4ext will load it only when the game's version matches; plugins can also target the latest defined runtime or be runtime-independent.Read 7 Oct 2026 · docs.red4ext.com
Plugin controls
Configuration options can disable the plugin system or ignore specified plugins.Read 7 Oct 2026 · docs.red4ext.com
Plugin development
Plugins can be built with any toolchain that produces x86-64 output using the __fastcall calling convention; the guide lists CMake, Premake, and Visual Studio as examples.Read 7 Oct 2026 · docs.red4ext.com
Plugin features
Plugins can add features, modify game behavior, add scripting functions, or call existing game functions.Read 8 Oct 2026 · github.com
Plugin loader
The RED4ext component manages plugins and loads them for the specified game version.Read 7 Oct 2026 · docs.red4ext.com
Plugin management
RED4ext loads plugins and manages them for the specified game version.Read 8 Oct 2026 · docs.red4ext.com
Plugin setup
Plugins are placed in the game's red4ext/plugins directory or a subdirectory within it.Read 8 Oct 2026 · docs.red4ext.com
Prerequisite
The installation guide says Visual C++ Redistributable 2022 must be installed.Read 8 Oct 2026 · docs.red4ext.com
SDK
RED4ext.SDK can be used to interact with the game's scripting VM, create native classes or functions, and use reversed game structures.Read 7 Oct 2026 · docs.red4ext.com
Uninstallation
To uninstall RED4ext, remove d3d11.dll, powrprof.dll, or winmm.dll from the game's bin/x64 directory, and optionally remove its red4ext directory.Read 7 Oct 2026 · docs.red4ext.com
Version support
A plugin can specify the game runtime version it supports, and RED4ext loads it only when the game's version matches unless the plugin targets the latest or is runtime independent.Read 8 Oct 2026 · docs.red4ext.com

Plans and prices

RED4ext Free Script extender and plugin manager for Cyberpunk 2077 Read 8 Oct 2026 · github.com

Every RED4ext plan and price →

Strong points and limits

Strong points

  • Free plan with no purchase required
  • SDK exposes scripting VM and native structures
  • Runtime-specific plugin loading
  • Supports custom game states
  • Per-plugin logging and configuration controls

Limits

  • Windows and Cyberpunk 2077 only
  • Requires Visual C++ Redistributable 2022
  • Plugins must use x86-64 and __fastcall
  • No free trial because software is free

Who it suits

RED4ext suits Cyberpunk 2077 mod developers working on Windows who need scripting access and plugin loading. It is aimed at developers whose toolchain can produce x86-64 __fastcall builds.

Verdict

RED4ext provides a focused Windows foundation for Cyberpunk 2077 plugins, combining runtime-aware loading with an SDK and development controls. Its requirements and game-specific scope make it relevant primarily to mod developers targeting this setup.

Where Specifiction places it

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