RKWC Book
Tap any word while reading to see its Cambridge meaning and save it. Your books stay on this tablet.
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Tap the time to change it: type minutes (20) or minutes:seconds (7:30). You can change it while it runs.
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Flashcards
Anki
Then open the downloaded .apkg file (Chrome shows "Open") with AnkiDroid. If nothing opens: AnkiDroid → menu → Import → pick the file from Downloads.