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Retro Virtual Machine vs Clock Signal: catalog facts
Retro Virtual Machine	Clock Signal
Free Downloadable from the official site; no price is listed.	Free Free and open source, developed by Tom Harte.
Windows, macOS, Linux	macOS, Linux
Covers several 8-bit computers and consoles in one program PAL and NTSC models with correct aspect ratio	Emulates a wide range of 8- and 16-bit computers and consoles in one program Designed around low input and display latency
Releases are infrequent Limited to 8-bit era systems	No separate project homepage beyond the GitHub repository Some systems need original ROM images supplied by the user
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: MIT
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.