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puNES vs FCEUX: catalog facts
puNES	FCEUX
Free Free to download, with source code published on GitHub.	Free Free and open source under the GPL.
Windows, Linux	Windows, macOS, Linux
Wide NES mapper support Built-in player for NSF, NSF2 and NSFe music	Lua scripting and frame-precise movie recording for tool-assisted runs Debugger, hex editor and PPU viewers built in
Described by the project as a work in progress No macOS build mentioned	Interface is dated and dense with developer tools NES and Famicom only
Downloadable app	Downloadable app
Open source	Open source
License not stated	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 September 23, 2026	Official website Full listing and sources Checked September 22, 2026

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