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