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Clock Signal vs Stella: catalog facts
Clock Signal	Stella
Free Free and open source, developed by Tom Harte.	Free Free and open source under the GPL.
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	Extremely broad cartridge and peripheral coverage Built-in debugger and accurate TV display effects
No separate project homepage beyond the GitHub repository Some systems need original ROM images supplied by the user	Single-system emulator The 2600's own quirks mean some games still need per-game settings
Downloadable app	Downloadable app
Open source	Open source
License: MIT	License: GPL-2.0
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 September 23, 2026	Official website Full listing and sources Checked September 22, 2026

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