Offline First Database Comparison - Exact Same App with Firebase, AWS Amplify, RxDB, PouchDB and WatermelonDB

 https://github.com/pubkey/client-side-databases

Supabase with Ionic

https://devdactic.com/supabase-ionic/ 

Supabase is an open source Firebase alternative that’s currently in Beta but getting a lot of great feedback

Firebase related

https://www.cypressoft.com/post/choose-firebase-over-backend-development