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Atari800 vs Altirra: catalog facts
Atari800	Altirra
Free Free and open source under the GPL.	Free Free to download.
Windows, macOS, Linux, Android	Windows
Covers Atari 8-bit computers and the 5200 Very portable, with many ports	Cycle-exact emulation of documented hardware Covers the whole Atari 8-bit line plus the 5200
Plain interface compared with newer emulators Android version goes under a different name	Windows only Atari 8-bit systems only
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.