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RetroArch vs Nestopia (Richard Bannister): catalog facts
RetroArch	Nestopia (Richard Bannister)
Free Free and open source, funded by donations.	Free Free download; the optional Emulator Enhancer add-on is shareware.
Windows, macOS, Linux, Android, iOS	macOS
Configure once and every emulator core inherits the settings Runs on desktops, phones and a long list of games consoles	Cycle-exact NES emulation for timing-sensitive games Supports 201 mappers and the Famicom Disk System
The settings menu is deep and intimidating the first time You still have to download cores, and some systems need BIOS files you must supply	Gamepad and full screen support require the paid Emulator Enhancer add-on macOS only
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-3.0	License not stated
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 20, 2026	Official website Full listing and sources Checked October 2, 2026

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