Firebase

Backend services that let frontend developers pretend servers don’t exist.

Best use cases
Web app backends
Mobile app backends
Authentication
Realtime databases
Prototyping and MVPs
Pros
Very fast to get started
Realtime and Firestore databases
Built-in authentication
Strong Google ecosystem integration
Good documentation
Cons
Vendor lock-in concerns
Costs can scale unexpectedly
Complex queries are limited
Pricing
freemium
Generous free tier + pay-as-you-go pricing
Alternatives