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Stella vs Clock Signal: catalog facts
Stella	Clock Signal
Free Free and open source under the GPL.	Free Free and open source, developed by Tom Harte.
Windows, macOS, Linux	macOS, Linux
Extremely broad cartridge and peripheral coverage Built-in debugger and accurate TV display effects	Emulates a wide range of 8- and 16-bit computers and consoles in one program Designed around low input and display latency
Single-system emulator The 2600's own quirks mean some games still need per-game settings	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-2.0	License: MIT
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 September 22, 2026	Official website Full listing and sources Checked September 23, 2026

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