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Brainscape vs Parley: catalog facts
Brainscape	Parley
Freemium Free to start, with paid upgrades for extra features.	Free Free and open source as part of the KDE applications.
Android, iOS, Web	Windows, Linux
Large catalog of ready-made decks Confidence-based spaced repetition	Spaced repetition scheduling for reviews Several training modes, including multiple choice and written answers
Proprietary, cloud-based decks Some features sit behind a paid upgrade	No mobile apps Desktop interface feels dated next to app-based trainers
Downloadable app, Web application	Downloadable app
Closed source	Open source
License not stated	License: GPL-2.0-or-later
Account needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 24, 2026

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