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

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