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RetroArch vs ZEsarUX: catalog facts
RetroArch	ZEsarUX
Free Free and open source, funded by donations.	Free Free and open source.
Windows, macOS, Linux, Android, iOS	Windows, macOS, Linux
Configure once and every emulator core inherits the settings Runs on desktops, phones and a long list of games consoles	Covers every Sinclair computer Supports many regional Spectrum and ZX81 clones
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	Dense interface with many options Focused on Sinclair machines and their clones
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: GPL-3.0
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 September 23, 2026

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