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FCEUX vs puNES: catalog facts
FCEUX	puNES
Free Free and open source under the GPL.	Free Free to download, with source code published on GitHub.
Windows, macOS, Linux	Windows, Linux
Lua scripting and frame-precise movie recording for tool-assisted runs Debugger, hex editor and PPU viewers built in	Wide NES mapper support Built-in player for NSF, NSF2 and NSFe music
Interface is dated and dense with developer tools NES and Famicom only	Described by the project as a work in progress No macOS build mentioned
Downloadable app	Downloadable app
Open source	Open source
License: GPL-2.0	License not stated
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 September 23, 2026

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