We only have mobile apps, so I can’t speak for web apps, but for us Realm (https://realm.io/ https://realm.io/) has been amazing. The Local API’s are a joy to

We only have mobile apps, so I can’t speak for web apps, but for us Realm (https://realm.io/ https://realm.io/) has been amazing. The Local API’s are a joy to work with. The capabilities of the local database makes Firebase look like a toy, and the sync service does solid two-way replication between devices. Definitely one of the best backend-as-a-service we have tried (but our experience is mobile only, so yemv).