These save data to Anki’s card:
- Github: anki-persistence
- template: DECK: Template for gamification (SPRITE)
- template: add a learning timer on the card
- AnkiForums+Github: For template developers: tools for using persistent localStorage in ankidroid
- AnkiForums, addon: Can I store custom metadata in a note type?
- AnkiDroid: Adding progress bar to card template