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Altirra vs Atari800: catalog facts
Altirra	Atari800
Free Free to download.	Free Free and open source under the GPL.
Windows	Windows, macOS, Linux, Android
Cycle-exact emulation of documented hardware Covers the whole Atari 8-bit line plus the 5200	Covers Atari 8-bit computers and the 5200 Very portable, with many ports
Windows only Atari 8-bit systems only	Plain interface compared with newer emulators Android version goes under a different name
Downloadable app	Downloadable app
Open source	Open source
License: GPL-2.0	License: GPL-2.0
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 23, 2026

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