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Anki is an app for memorizing vocabulary or anything (Spaced Repetition Software).
It has apps for Linux, Mac, Windows, Android, iOS, and a sync protocol makes it easy to use it on several devices.
Is there an SRS app for Chrome OS that can sync using the same sync protocol?
Preferably free & open source.
AnkiDroid is available on the Chrome Web Store.
AnkiDroid is 100% compatible with Anki, even though it is developed by a different team.
Free and open source.
Disclaimer: I maintain AnkiDroid