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Javatari vs MAME: catalog facts
Javatari	MAME
Free Free to use in the browser.	Free Free and open source under the GPL 2.0. No ROMs are included.
Web	Windows, macOS, Linux
Runs in a browser with no install Supports many 2600 cartridge formats	Covers thousands of arcade, console and computer systems in one program Accuracy is the stated priority, so behaviour matches the original hardware
Covers only the Atari 2600 Copyright notice dates from 2015, so updates may be infrequent	Accurate emulation of later hardware needs a genuinely fast machine ROM sets must match the exact version MAME expects, which frustrates newcomers
Web application	Downloadable app
Closed source	Open source
License not stated	License: GPL-2.0
No account needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked September 21, 2026

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