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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.
You may find this plugin really handy, it turns WordPress into a GraphQL API - MUCH easier to deal with compared to database calls, or WordPress rest API calls: https://www.wpgraphql.com/
There are several alternatives to Firebase for a Flutter App - are you mainly looking for the data persistence or sync too? E.g. check out ObjectBox (biased) https://github.com/objectbox/objectbox-dart
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.