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Stella vs Javatari: catalog facts
Stella	Javatari
Free Free and open source under the GPL.	Free Free to use in the browser.
Windows, macOS, Linux	Web
Extremely broad cartridge and peripheral coverage Built-in debugger and accurate TV display effects	Runs in a browser with no install Supports many 2600 cartridge formats
Single-system emulator The 2600's own quirks mean some games still need per-game settings	Covers only the Atari 2600 Copyright notice dates from 2015, so updates may be infrequent
Downloadable app	Web application
Open source	Closed source
License: GPL-2.0	License not stated
Not stated if an account is needed	No account needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 24, 2026

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