Supabase
Open-source Firebase alternative on Postgres
Firebase
Google's realtime BaaS on NoSQL
Both are BaaS offerings. Supabase is Postgres-based (relational, SQL, open-source), Firebase is Firestore-based (NoSQL, proprietary, Google Cloud). Supabase wins if you want SQL, lower lock-in, and predictable pricing. Firebase wins for mobile-first apps tied to Google's ecosystem.
Pick Supabase when you want relational SQL, open-source, and portable Postgres underneath.
Pick Firebase when you ship mobile apps, use FCM, and live inside Google Cloud anyway.
| Feature | 🟢Supabase | 🔥Firebase | Winner |
|---|---|---|---|
| Data model | Relational SQL (Postgres) | Document NoSQL (Firestore) | Tie |
| Open source | Yes (Apache 2.0) | No | A |
| Self-host | Yes | No | A |
| Realtime | Postgres changes + broadcast | Firestore listeners (more mature) | B |
| Mobile SDKs | JS / Flutter / Swift | Native SDKs for every platform | B |
| Complex queries / joins | Full SQL | Limited, often requires denormalization | A |
| Pricing predictability | Fixed tiers + usage | Per-read billing can spike | A |
| Offline sync | Limited (PowerSync etc.) | Built-in | B |
Data model
TieSupabase
Relational SQL (Postgres)
Firebase
Document NoSQL (Firestore)
Open source
ASupabase
Yes (Apache 2.0)
Firebase
No
Self-host
ASupabase
Yes
Firebase
No
Realtime
BSupabase
Postgres changes + broadcast
Firebase
Firestore listeners (more mature)
Mobile SDKs
BSupabase
JS / Flutter / Swift
Firebase
Native SDKs for every platform
Complex queries / joins
ASupabase
Full SQL
Firebase
Limited, often requires denormalization
Pricing predictability
ASupabase
Fixed tiers + usage
Firebase
Per-read billing can spike
Offline sync
BSupabase
Limited (PowerSync etc.)
Firebase
Built-in
Best for
Best for
Migrating Firebase to Supabase requires schema design up front — export Firestore JSON, design normalized tables, write an ETL with @supabase/supabase-js. Firebase Auth users export via Admin SDK, then import into Supabase Auth with password hashes preserved. Plan ~1-2 weeks for a non-trivial app.
Both are BaaS offerings. Supabase is Postgres-based (relational, SQL, open-source), Firebase is Firestore-based (NoSQL, proprietary, Google Cloud). Supabase wins if you want SQL, lower lock-in, and predictable pricing. Firebase wins for mobile-first apps tied to Google's ecosystem. In short: Supabase — Open-source Firebase alternative on Postgres. Firebase — Google's realtime BaaS on NoSQL.
Pick Supabase when you want relational SQL, open-source, and portable Postgres underneath.
Pick Firebase when you ship mobile apps, use FCM, and live inside Google Cloud anyway.
Migrating Firebase to Supabase requires schema design up front — export Firestore JSON, design normalized tables, write an ETL with @supabase/supabase-js. Firebase Auth users export via Admin SDK, then import into Supabase Auth with password hashes preserved. Plan ~1-2 weeks for a non-trivial app.
Yes. Both have MCP servers installable via MCPizy (mcpizy install supabase and mcpizy install firebase). They work identically across Claude Code, Claude Desktop, Cursor, Windsurf, and any other MCP-compatible client. You can install both side by side and route queries in your agent's prompt.
Supabase is managed Postgres plus auth, storage, edge functions, and realtime. Plain Postgres gives you the same battle-tested engine without the batteries — you run it yourself. Supabase wins for speed-to-product; Postgres wins for full control and cost at scale.
Both are mature open-source relational databases. Postgres has richer SQL (CTEs, window functions, JSON, arrays, extensions), stricter standards compliance, and better for complex analytics. MySQL is simpler, often faster on basic read-heavy workloads, and dominates WordPress/PHP ecosystems.
MongoDB is a document database — flexible schemas, built-in sharding, great for unstructured data and rapid prototyping. Postgres is relational but its JSONB type covers most 'flexible schema' use-cases while also giving you joins, transactions, and stricter integrity.
Not sure? Run both side by side — swap between them in your AI agent with a single config line.