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Retro Virtual Machine vs ZEsarUX: catalog facts
Retro Virtual Machine	ZEsarUX
Free Downloadable from the official site; no price is listed.	Free Free and open source.
Windows, macOS, Linux	Windows, macOS, Linux
Covers several 8-bit computers and consoles in one program PAL and NTSC models with correct aspect ratio	Covers every Sinclair computer Supports many regional Spectrum and ZX81 clones
Releases are infrequent Limited to 8-bit era systems	Dense interface with many options Focused on Sinclair machines and their clones
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: GPL-3.0
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked September 23, 2026

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