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Firebase battlecard · vs Supabase

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Citation-backed pricing teardown, verified churn drivers and rebuttal talk tracks.

Executive summary

Firebase's free Spark plan disappears the moment you exceed 50k MAUs or enable paid features, and the Blaze plan silently bills per-document reads via the pricing calculator. Developers repeatedly cite unpredictable billing, vendor lock-in on proprietary APIs, and painful migrations off Firestore. Lead with migration path, realtime/Postgres wins, and predictable pricing.

Strengths

  • • Zero-config SDKs and first-party Auth/Security rules
  • • Generous free tier for prototypes
  • • Strong mobile + iOS/Android integration

Weaknesses

  • • Proprietary Firestore — hard to migrate off
  • • Pricing calculator obscures real cost
  • • Query model limits (no joins, composite filters)

Opportunities

  • • Postgres-backend teams can adopt SQL + realtime
  • • Self-host & region flexibility stage-0 desire
  • • Predictable per-project pricing room

Threats

  • • Google product roadmap risk and deprecated APIs
  • • BigQuery/other Google services extend lock-in