Everest vs Ultimate ASI Loader

Everest is a free, open-source mod loader and modding API for Celeste. It lets players use mods with custom maps, texture replacements and code-driven additions such as sound effects, graphics, dialogue and campaigns, without changing original game files. An in-game updater and dependency downloader help manage mods. The cross-platform Olympus installer can install mods with one click from its Download Mods section or GameBanana, or from ZIP files and folders; players can also switch between Everest and vanilla Celeste through Olympus or the title screen. Everest supports Windows, macOS and Linux and works with Celeste from itch.io, Steam and Epic Games, but not the Windows Store version. Enhanced Debug Mode offers live map reloading, code and asset reload shortcuts, an improved map viewer and console logging. The project is MIT-licensed and maintained by volunteers. Olympus is actively being worked on and may fail, and the project directs users to the Celeste Discord’s #modding_help channel for bug reports and questions.

Ultimate ASI Loader is a free Windows proxy DLL that loads custom .asi libraries into a game process. It supports games using Win32 or Win64 libraries such as Direct3D, DirectInput, audio, and XInput. Installation usually means placing the DLL in the game directory as dinput8.dll, or renaming it to another supported DLL name. ASI files can be stored in the game root, scripts, plugins, or update folder. When needed, global.ini belongs in scripts or plugins, and the selected DLL name can also serve as the INI filename. The update folder can hold replacement game files while originals remain untouched; removing that folder reverses the change. The loader can forward many original DLLs after renaming them Hooked.dll, and d3d8to9 support is available when it is named d3d8.dll. Crash minidumps and logs are created when a CrashDumps folder exists beside the loader. Win32 and Win64 builds are available, including smaller NoPDB archives. The repository lists an MIT license.