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USP - ZX Spectrum Emulator vs ZEsarUX: catalog facts
USP - ZX Spectrum Emulator	ZEsarUX
Free Free and open source under the GPL-3.0-or-later licence.	Free Free and open source.
Android	Windows, macOS, Linux
Wide file format support including tzx, trd and rzx Emulates Pentagon 128K with AY/YM sound and Beta Disk	Covers every Sinclair computer Supports many regional Spectrum and ZX81 clones
Emulates the ZX Spectrum family only Sparse project homepage and documentation	Dense interface with many options Focused on Sinclair machines and their clones
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-or-later	License: GPL-3.0
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 October 2, 2026	Official website Full listing and sources Checked September 23, 2026

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