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

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