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FCEUX vs Mesen: catalog facts
FCEUX	Mesen
Free Free and open source under the GPL.	Free Free and open source under the GPL.
Windows, macOS, Linux	Windows, macOS, Linux
Lua scripting and frame-precise movie recording for tool-assisted runs Debugger, hex editor and PPU viewers built in	Cycle-accurate emulation with one of the best debuggers in any emulator Covers several systems in a single application
Interface is dated and dense with developer tools NES and Famicom only	Accuracy costs more CPU than fast emulators The debugging feature set is overwhelming if you only want to play
Downloadable app	Downloadable app
Open source	Open source
License: GPL-2.0	License: GPL-3.0
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 22, 2026

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