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

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