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Flash Deck vs AlgoApp: catalog facts
Flash Deck	AlgoApp
Free Free and open source under the GPL 3.0 licence.	Freemium Free to start, with paid options.
Android	Windows, macOS, Android, iOS, Web
Quick card entry with Save and Add Another Reversible cards for testing both directions	FSRS spaced repetition scheduling Creates cards from PDFs, photos, prompts and CSV files
Android only Simpler than full spaced-repetition apps such as Anki	Closed source Details of the paid tier are not shown on the homepage
Downloadable app	Downloadable app, Web application
Open source	Closed source
License: GPL-3.0-only	License not stated
Not stated if an account is 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 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.