One launcher for all your FNF mods

Browse GameBanana and Psych Online, install engines, and launch your favorite Friday Night Funkin' mods from one desktop app.

What WeekBox does

WeekBox brings the entire FNF mod ecosystem into a single app. Discover new mods on the Home feed, install them with one click, and let WeekBox handle engine assignment, archive extraction, and file organization automatically.

• Browse Mods: Discover featured and trending mods from GameBanana and Psych Online directly inside the app.
• Manage Engines: Install, update, and switch between Psych Engine, V-Slice, Codename Engine, P-Slice, FPS Plus, and Psych Online.
• Multi-Platform: Native builds for Windows (x64), macOS (Intel + Apple Silicon), and Linux (x64, ARM64, ARMHF).
• Smart Downloads: Parallel multi-part downloads with automatic retry, validation, and support for ZIP, 7z, and RAR archives.
• 1-Click GameBanana Installs: Skip the hassle of manual downloads. Just press the 1-Click Install button on any GameBanana mod page, and WeekBox will automatically open, download, and set up the mod for you.
• Localized UI: Available in English, German, French, Italian, Spanish, Portuguese, Russian, Indonesian, Turkish, and Chinese.