Full NES, Famicom & mapper support
Rewritten core for better accuracy and stability
CPU/PPU debugger, hex, RAM watch
Frame-by-frame input recording
Custom HUDs & automation
100% native coverage, auto locale detect
FCEUX11 is a derivative of the FCEUX NES/Famicom emulator, optimized for Windows.
It inherits FCEUX's renowned emulation accuracy while delivering a polished, modern Windows-native experience powered by Qt 6. Multi-language support — covering 12 languages — and a full suite of debugging and TAS tools are built in for developers and speedrunners alike.
Ongoing internal refactoring and performance optimization keep the emulator efficient, smooth, and stable — even under heavy load. Whether you're revisiting childhood classics or diving into ROM hacking, FCEUX11 runs your NES games smoothly and looks great doing it.
The CPU core is now written in Rust, improving emulation accuracy and stability.
Games that rely on uncommon CPU instructions now run correctly.
Save states created with earlier versions remain compatible with the new core.
The built-in KagamiQA test system runs continuously to verify emulation accuracy and catch issues before each release.