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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.
There is a mobile client here but I haven't tried it yet. The web app is good enough for my needs, as it's what's known as a "progressive web app". I use my browser's (Firefox) "Install" feature to add a shortcut to my android home screen, and it makes it seem like a native app.
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