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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.
Option 2: flutter. This could build the app in one codebase writing everything in one language, dart. It's Google crossplatform UI framework which could help speed up the development bringing it to both platforms. some posts with examples
For your use case, flutter might make the most sense since the use case is pretty simple being a CRUD app. Then for the functionality of updating a group chat, you could pretty easily copy paste stuff. Or you could use something like Firestore to sync this data to a server and then cloud functions to send push notifications to others who have the app. Firebase is something that would work for any of the solutions posted above.
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