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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.
If you want to build native mobile apps, you probably better stick with Kotlin/Java on Android and Swift/ObjectiveC on IOS.
If you want to build progressive web apps; sure. You can use Cordova (https://cordova.apache.org/) to package them.
NOTE:
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Hence, a higher number means a more popular project.