Firebase's Spark tier is generous for MVPs.
Blaze is truly pay-as-you-go with predictable pricing for most apps.
Free
No credit card required
Usage-based
Pay only for what you use
SMS auth costs per message
Firestore at scale can be expensive
Cloud Functions egress
Mobile apps
Startups
Real-time apps
Rapid prototyping
startup
Spark is perfect for MVP. Upgrade to Blaze when you need Cloud Functions or exceed limits.
freelancer
Spark handles most client projects without any cost.
Supabase has a more generous free tier for Postgres. AWS Amplify is more complex. Firebase best for mobile-first.