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Anki-Android
AnkiDroid: Anki flashcards on Android. Your secret trick to achieve superhuman information retention.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Did you look at the official Anki website? In the Download section, in the iPhone/Android tab, they have links to the mobile versions. Make sure you've already made an account on Ankiweb so you're backing up your Anki cards to the cloud and can sync between mobile and your desktop version. Note that many Anki add-ons only work with the desktop version, and not on mobile, but don't worry -- you won't mess up your cards by reviewing them on mobile.
Update: looks like recently some other people are having issues installing Ankidroid well, due to some recent Google Play update from this month. See this thread . Here's the dev's description of the issue.