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FCEUX vs Nestopia UE: catalog facts
FCEUX	Nestopia UE
Free Free and open source under the GPL.	Free Free and open source under the GPL.
Windows, macOS, Linux	Windows
Lua scripting and frame-precise movie recording for tool-assisted runs Debugger, hex editor and PPU viewers built in	Based on the well-known Nestopia core Includes a game database and palettes
Interface is dated and dense with developer tools NES and Famicom only	This repository covers only the legacy Win32 build New GUI development has moved to the Jolly Good Emulation project
Downloadable app	Downloadable app
Open source	Open source
License: GPL-2.0	License: GPL
Not stated if an account is needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked October 1, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.