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ZEsarUX vs Clock Signal: catalog facts
ZEsarUX	Clock Signal
Free Free and open source.	Free Free and open source, developed by Tom Harte.
Windows, macOS, Linux	macOS, Linux
Covers every Sinclair computer Supports many regional Spectrum and ZX81 clones	Emulates a wide range of 8- and 16-bit computers and consoles in one program Designed around low input and display latency
Dense interface with many options Focused on Sinclair machines and their clones	No separate project homepage beyond the GitHub repository Some systems need original ROM images supplied by the user
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: MIT
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 September 23, 2026

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