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{{Infoboxemulator|image logo = FCEUX.png|imagewidth logowidth = 6470|first version = 2.2.3{{Version|FCEUX}}|second active = Yes|third platform = [[Emulators on Windows|Windows, ]]<br/>[[Emulators on Linux|Linux]]<br/>[[Emulators on macOS|macOS]]<br/>Solaris<br/>BSD|target = [[Nintendo Entertainment System emulators|NES]]|fourth developer = FCEUX Team|fifth website = [http://www.fceux.com/web/home.html FCEUX.com]|sixth source = [httphttps://sourceforgegithub.netcom/projectsTASEmulators/fceultra/files/latest/download?sourcefceux GitHub]|license =files SourceForge]GNU GPLv2}}

'''FCE Ultra XExtended''', typically shortened to '''FCEUX''', is a an open-source [[Nintendo Entertainment System emulators|Famicom (NES)]] emulator, as well as a and Famicom Disk System (FDS) emulator. It is began as an amalgamation of several FCE Ultra forks, designed to bring unify the then vast number of FCE Ultra branches to a halt due to the vast number and their with differing features. Ironically, it FCEUX has also itself been forked, though mostly to increase the amount of platforms it is on, such as a [[GameCube emulators|GameCube]] and [[Wii emulators|Wii]] port known as FCEUGXFCE Ultra GX.

*{| cellpadding="4"|-|align=center|{{Icon|Win-big}}|'''[https://ci.appveyor.com/project/zeromus/fceux/build/artifacts Dev builds]'''<br/><small>Compiled on AppVeyor</small>|-|colspan="3"|<hr/>|-|align=center|{{Icon|Win-big}}|[http://www.emucr.com/search/label/Fceux SVN Dev Builds]<br/><small>Compiled by emucr</small>|-|align=center|{{Icon|GCN|Wii}}*|[https://codegithub.googlecom/dborth/fceugx/releases FCE Ultra GX]<br/><small>Includes cheat files</small>|-|align=center|{{Icon|GCN|Wii}}|[https://github.com/pniuus/fceugcFCEUltraRX/downloadsreleases FCE Ultra RX]<br/list Latest ><small>First fork of FCEUGX version (</small>|-|align=center|{{Icon|GCN|Wii}}|[https://gbatemp.net/threads/GC only)fceugx-1up.558023 FCEUX TX]<br/><small>Fork of FCEUGX by Tanooki16, based in FCEUX 2.4.0</small>|}

Despite its extensive toolset, it is less accurate than other NES /FDS emulators like [[Nestopia]], [[Mesen]] and [[PuNESpuNES]]. However, thanks to FCEUmm being one of the forks it incorporates, it still has its uses as a highly compatible standalone emulator. It is recommended to download the latest SVN AppVeyor build as the stable release is very old. It is also popular for developing new NES games, due to its excellent debugging tools. However, however if you develop games/ROM hacks, be sure to test them on more accurate emulators, and/or with a flash cart on the real system to ensure compatibility.