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Ironwail vs idTech4A++: catalog facts
Ironwail	idTech4A++
Free Free and open source; requires your own Quake game data.	Free Free and open source under the GPL-3.0 licence.
Windows, Linux	Windows, Linux, Android
Built for high performance Based on the widely used QuakeSpasm	Supports a long list of idTech and related game engines in one app Actively developed with frequent commits
Requires game data from a copy of Quake Covers the original Quake only	Game data files are not included Setup per game can take some effort
Downloadable app	Downloadable app
Open source	Open source
License: GPL-2.0	License: GPL-3.0
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

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