What is acstuff.ru?
acstuff.ru is the development and documentation hub for x4fab's Assetto Corsa tools — Content Manager, Custom Shader Patch and the broader actools suite. Here is what each tool does and when you actually need to visit the site.
Who is x4fab and what is the actools project?
x4fab — also known as ilja — is an independent developer who has built and maintained the most widely used third-party tools for Assetto Corsa. The two projects most players know are Content Manager, the alternative launcher, and Custom Shader Patch, the graphics overhaul. Both started as personal projects and grew into the de-facto standard tools for the Assetto Corsa modding community.
acstuff.ru is x4fab's technical home on the web. It hosts documentation, changelogs and additional tools in the actools suite that go beyond Content Manager. Most players never need to visit acstuff.ru directly — the standard download path goes through assettocorsa.club. But if you are a mod author, looking for a development build or researching a specific technical tool in the suite, acstuff.ru is where you will find it.
What the actools suite includes
The third-party launcher for Assetto Corsa. Replaces the default Kunos launcher with a faster interface for session setup, online racing and mod management. Free, with an optional paid Full upgrade.
Read the guide →A graphics modification that replaces Assetto Corsa's rendering pipeline with modern lighting, shadows, dynamic weather and rain effects. Free. Installed and managed through Content Manager.
Read the guide →A collection of command-line and utility tools for Assetto Corsa modding — including a KN5 (3D asset) viewer, texture editor and batch-processing tools for mod authors. More technical than Content Manager; primarily used by mod creators rather than players.
A companion tool to Content Manager for hosting and configuring Assetto Corsa multiplayer servers. Provides a GUI for setting race conditions, entry lists and server parameters without editing configuration files manually.
Which site to use and when
| Task | Go to |
|---|---|
| Download Content Manager (stable) | assettocorsa.club |
| Purchase Content Manager Full | assettocorsa.club |
| Install Custom Shader Patch | Via Content Manager (no site needed) |
| Access development/preview builds of CM or CSP | acstuff.ru |
| KN5 viewer or mod-author tooling | acstuff.ru |
| Changelog and release history | acstuff.ru or assettocorsa.club |
For most players, the answer is assettocorsa.club. The need to visit acstuff.ru directly is limited to mod authors, developers working on CSP-compatible content, and players who specifically want preview builds ahead of the stable release.
acstuff.ru — common questions
What is acstuff.ru?
acstuff.ru is the development website and documentation hub for x4fab's Assetto Corsa tools, including Content Manager and Custom Shader Patch. It is distinct from assettocorsa.club, which is the public-facing download site. acstuff.ru is primarily aimed at users who want technical documentation, changelogs and access to development builds rather than the standard release.
What is the difference between acstuff.ru and assettocorsa.club?
assettocorsa.club is the main public site where most users download Content Manager and purchase Content Manager Full. acstuff.ru is x4fab's technical hub — it hosts more detailed documentation, additional tools in the actools suite and access to preview or development builds of Content Manager and CSP. For a standard install, assettocorsa.club is the right starting point.
Who is x4fab?
x4fab, also known as ilja, is the independent developer responsible for Content Manager and Custom Shader Patch for Assetto Corsa. Both projects are maintained by a single developer. x4fab operates assettocorsa.club and acstuff.ru as the publication and documentation points for these tools.
What is actools for Assetto Corsa?
actools is the broader software suite developed by x4fab for the Assetto Corsa modding ecosystem. It includes Content Manager (the launcher most players use) and a collection of lower-level tools for mod authors — such as a KN5 3D asset viewer, texture editor and batch-processing utilities. Most players only need Content Manager from the suite.
Is acstuff.ru safe?
Yes — acstuff.ru is operated by x4fab, the legitimate developer of Content Manager. However, most players have no reason to visit it directly. The standard Content Manager release and Content Manager Full purchase are both available on assettocorsa.club, which is the correct starting point for the majority of users.
Can I download Content Manager from acstuff.ru?
acstuff.ru hosts development and preview builds of Content Manager alongside other tools. For the standard stable release, assettocorsa.club is the recommended download point. Development builds from acstuff.ru are updated more frequently but may include experimental features or unresolved compatibility issues.