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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.
The licence is stored with Google, so licence verification requires their services. You'll find this problem with the vast majority of in-app purchases on Android If you're trying to avoid Google, given that they are the owners and developers of the OS. The closest you can get to de-googling your phone without losing access to your purchases is to use an alternative Google services implementation like microg https://microg.org/
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.