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Clock Signal vs Retro Virtual Machine: catalog facts
Clock Signal	Retro Virtual Machine
Free Free and open source, developed by Tom Harte.	Free Downloadable from the official site; no price is listed.
macOS, Linux	Windows, macOS, Linux
Emulates a wide range of 8- and 16-bit computers and consoles in one program Designed around low input and display latency	Covers several 8-bit computers and consoles in one program PAL and NTSC models with correct aspect ratio
No separate project homepage beyond the GitHub repository Some systems need original ROM images supplied by the user	Releases are infrequent Limited to 8-bit era systems
Downloadable app	Downloadable app
Open source	Closed source
License: MIT	License not stated
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked October 1, 2026

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