What are all the NOSQL databases that we can use it to build flutter apps ?

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Accepted Answer

## NoSQL Databases for Flutter

**NoSQL options for Flutter apps:**

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## Cloud Databases

### Firebase Realtime Database
- JSON-based
- Real-time sync
- Offline support
- Google-backed

### Firestore
- Document-based
- Complex queries
- Real-time + offline
- Scale automatically

### MongoDB (via Atlas)
- Document database
- Powerful queries
- Server-side logic

---

## Local Databases

### Hive
- Key-value store
- Very fast
- Simple API

### Realm
- Object database
- Fast queries
- Syncing (Realm Sync)

### ObjectBox
- Object database
- Relations support
- Very fast

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## Selection Criteria

```dart
// Real-time sync needed?
if (needsRealtimeSync) {
  // Use Firestore or Firebase
}

// Local storage only?
else if (localOnly) {
  // Use Hive or ObjectBox
}

// Complex queries?
else if (complexQueries) {
  // Use MongoDB or Firestore
}
```

> **Popular:** Firestore + Hive (cloud + local backup).

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