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Retro Virtual Machine vs USP - ZX Spectrum Emulator: catalog facts
Retro Virtual Machine	USP - ZX Spectrum Emulator
Free Downloadable from the official site; no price is listed.	Free Free and open source under the GPL-3.0-or-later licence.
Windows, macOS, Linux	Android
Covers several 8-bit computers and consoles in one program PAL and NTSC models with correct aspect ratio	Wide file format support including tzx, trd and rzx Emulates Pentagon 128K with AY/YM sound and Beta Disk
Releases are infrequent Limited to 8-bit era systems	Emulates the ZX Spectrum family only Sparse project homepage and documentation
Downloadable app	Downloadable app
Closed source	Open source
License not stated	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 October 1, 2026	Official website Full listing and sources Checked October 2, 2026

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