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ZEsarUX vs USP - ZX Spectrum Emulator: catalog facts
ZEsarUX	USP - ZX Spectrum Emulator
Free Free and open source.	Free Free and open source under the GPL-3.0-or-later licence.
Windows, macOS, Linux	Android
Covers every Sinclair computer Supports many regional Spectrum and ZX81 clones	Wide file format support including tzx, trd and rzx Emulates Pentagon 128K with AY/YM sound and Beta Disk
Dense interface with many options Focused on Sinclair machines and their clones	Emulates the ZX Spectrum family only Sparse project homepage and documentation
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: GPL-3.0-or-later
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked October 2, 2026

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