Question 1

What's the difference between Firestore and Realtime Database?

Accepted Answer

Both are Firebase databases, but Firestore stores data as documents in collections (more flexible querying and structure), while Realtime Database stores one large JSON tree (simpler but more limited queries). Firestore generally scales better for complex apps, supports richer queries and indexing, and has strong multi-region options. Realtime Database can be a good fit for very simple real-time data or extremely low-latency presence-style use cases.

Question 2

When should I use Firestore?

Accepted Answer

Use Firestore when you need a managed NoSQL document database with real-time updates, offline support for mobile/web clients, and flexible data modeling (collections/documents). It’s a strong choice for user profiles, chat, collaborative apps, IoT dashboards, and apps that benefit from syncing data across devices. Consider alternatives if you need complex joins/transactions across many tables (SQL), heavy analytics queries (data warehouse), or strict relational constraints.

Question 3

How much does Firestore cost?

Accepted Answer

Firestore pricing is usage-based. Costs typically come from: (1) document reads, writes, and deletes, (2) stored data size, and (3) network egress (data leaving Google Cloud). Your bill depends on how often clients read data (including real-time listeners, which can increase read volume), how frequently you write updates, and how much data you store. Use the Google Cloud Pricing Calculator and monitor usage in Cloud Console to estimate and control spend.

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