Honest, experience-based backend-as-a-service comparison from engineers who have shipped production systems with both.
Supabase vs Firebase: Supabase is better for SQL-first teams who want PostgreSQL. Firebase is better for real-time apps and teams who want a fully managed Google ecosystem. Both dramatically reduce backend development time. Need help choosing? Get a free consultation →
3
Supabase Wins
0
Ties
3
Firebase Wins
Supabase vs Firebase: Supabase wins when you want Postgres (SQL, joins, RLS) with BaaS conveniences — OSS, self-hostable. Firebase wins for real-time offline-first mobile via Firestore + Google scale.
Supabase (open-source, Apache 2.0) is a BaaS built on PostgreSQL 15/16 with PostgREST, GoTrue auth, Realtime, and S3-compatible storage — all self-hostable. Firebase (Google, proprietary) offers Firestore (NoSQL document DB), Realtime Database, Auth, Cloud Functions, and Hosting. Free tiers: Supabase 500 MB DB + 1 GB storage + 50K MAU; Firebase Firestore 1 GB + 50K reads/day + 10K MAU. Typical monthly cost at 50K MAU with ~1 GB active data: Supabase Pro ~$25; Firebase Blaze ~$25–100 (depends on Firestore read volume). Pick Supabase for SQL, relational data, and no lock-in; Firebase for NoSQL, real-time mobile apps, and Google ecosystem.
| Criteria | Supabase | Firebase | Winner |
|---|---|---|---|
| Database | 10/10 | 6/10 | Supabase |
WhySupabase uses PostgreSQL — the most capable open-source database. Firebase uses Firestore, a NoSQL document database with limited querying. For relational data, Supabase wins decisively. | |||
| Real-Time | 7/10 | 10/10 | Firebase |
WhyFirebase was built for real-time: Firestore syncs data across clients instantly. Supabase has real-time subscriptions via PostgreSQL but it is not as deeply integrated. | |||
| Vendor Lock-In | 9/10 | 3/10 | Supabase |
WhySupabase is open-source and self-hostable. Your data is in standard PostgreSQL. Firebase is proprietary — migrating away from Firestore requires a complete rewrite. | |||
| Mobile SDKs | 7/10 | 10/10 | Firebase |
WhyFirebase has battle-tested mobile SDKs for iOS, Android, Flutter, and React Native with offline support, push notifications, and crash reporting. Supabase mobile support is growing but less mature. | |||
| Authentication | 8/10 | 9/10 | Firebase |
WhyFirebase Auth is one of the most mature authentication services available. Supabase Auth (GoTrue) is excellent and improving rapidly but Firebase has more social login providers. | |||
| Pricing | 9/10 | 6/10 | Supabase |
WhySupabase's pricing is more transparent and predictable. Firebase pricing can spike unexpectedly with Firestore reads — many developers have been surprised by bills. | |||
Scores use a 1–10 scale anchored to production behavior, not vendor marketing. 10 = production-proven at scale across multiple ZTABS deliveries with no recurring failure modes; 8–9 = reliable with documented edge cases; 6–7 = workable but with caveats that affect specific workloads; 4–5 = prototype-grade or stable only in a narrow slice; below 4 = avoid for new work. Inputs: vendor docs, GitHub issue patterns over the last 12 months, our own deployments, and benchmark data cited in the table when applicable.
Vendor-documented numbers and published benchmarks. Sources cited inline.
| Metric | Supabase | Firebase | Source |
|---|---|---|---|
| License | Apache 2.0 (open source, self-hostable) | Proprietary (Google) | github.com/supabase/supabase · firebase.google.com/terms |
| Database primary | PostgreSQL 15/16 (relational, SQL) | Firestore + Realtime Database (NoSQL document) | Official docs |
| Free tier — database | 500 MB dedicated Postgres, 2 projects | Firestore: 1 GB storage, 50K reads/day, 20K writes/day | supabase.com/pricing · firebase.google.com/pricing |
| Free tier — auth MAU | 50,000 | 10,000 (Identity Platform billing tier) | Official pricing pages |
| Free tier — bandwidth / egress | 5 GB/mo | Firestore: 10 GB/mo egress | Official pricing |
| Paid starter tier | Pro: $25/mo (8 GB DB, 100 GB bandwidth, 100K MAU) | Blaze (pay-as-you-go) — no flat starter | supabase.com/pricing · firebase.google.com/pricing |
| Realtime mechanism | Postgres logical replication → WebSocket (200K concurrent on Pro) | Firestore snapshot listeners (native to SDK) | Official docs |
| Row-level security | PostgreSQL RLS policies (SQL-native) | Firestore Security Rules (custom DSL) | Official docs |
| Server-side functions | Edge Functions (Deno, 150 MB mem, 400s timeout) | Cloud Functions (Node/Python/Go, 32 GB mem, 540s) | Official docs |
| Mobile SDK platforms | JS, Swift, Kotlin, Flutter, Python | JS, iOS, Android, Flutter, Unity, C++, RN | Official docs |
| GitHub stars | ~70K (supabase/supabase) | N/A (closed-source core) | github.com/supabase/supabase (Apr 2026) |
| Typical cost surprise risk | Low (flat + predictable overage) | High (per-read Firestore pricing can 10-100x unexpectedly) | Hacker News / Reddit r/Firebase community reports |
SaaS apps benefit from relational data, SQL queries, and Supabase's row-level security for multi-tenancy.
Firebase's real-time syncing and mature mobile SDKs are purpose-built for real-time mobile experiences.
Supabase's generous free tier, PostgreSQL foundation, and no vendor lock-in make it ideal for MVPs.
Firebase Realtime Database and Firestore handle real-time leaderboards and player data seamlessly.
The best technology choice depends on your specific context: team skills, project timeline, scaling requirements, and budget. We have built production systems with both Supabase and Firebase — talk to us before committing to a stack.
We do not believe in one-size-fits-all technology recommendations. Every project we take on starts with understanding the client's constraints and goals, then recommending the technology that minimizes risk and maximizes delivery speed.
Based on 500+ migration projects ZTABS has delivered. Ranges include engineering time, QA, and a typical 15% contingency.
| Project Size | Typical Cost & Timeline |
|---|---|
| Small (MVP / single service) | $3K–$12K, 2–5 weeks. <10 collections. Schema redesign from document to relational is ~1 week; auth provider swap ~2 days; client SDK rewrite is the bulk of the work. |
| Medium (multi-feature product) | $20K–$80K, 8–16 weeks. Firestore → Postgres requires denormalization rework (collections-of-collections become foreign keys). Realtime listener patterns map to Supabase subscriptions with different cursor semantics. |
| Large (enterprise / multi-tenant) | $100K–$400K+, 5–10 months. Production traffic cut-over requires dual-writes for 30-60 days. Cloud Functions must be re-authored as Edge Functions (Deno) or Node APIs. Security rules → RLS policy translation is non-trivial and needs pen-test. |
Under ~10K MAU and simple CRUD, both free tiers cover it. Past ~100K MAU, Firebase's per-read pricing can spike to $500-2K/mo vs a Supabase Pro $25/mo base — but self-hosting Supabase flips the cost profile again at scale.
Specific production failures we have seen during cross-stack migrations.
Schemaless storage tempts teams to skip migrations. Field renames or shape changes require app-level migration code because Firestore has no ALTER equivalent — plan migrations from day one.
Forgetting to enable RLS or misconfiguring policies ships databases where anon key can read all rows. Audit policies on every table and use the linter in Supabase Studio.
Third-way tools and approaches teams evaluate when neither side of the main comparison fits.
| Alternative | Best For | Pricing | Biggest Gotcha |
|---|---|---|---|
| Appwrite | Open-source BaaS self-hosters who want a broader feature set than Supabase. | Free OSS self-host; Cloud free tier; Pro $15/mo. | Smaller community and enterprise-readiness story than Supabase or Firebase. |
| Nhost | GraphQL-first teams wanting Hasura + Postgres + Auth as a managed BaaS. | Free tier; Pro from $25/mo per project. | Tiny community; hard to hire for vs Supabase/Firebase. |
| AWS Amplify | AWS-native teams wanting Cognito + DynamoDB/AppSync + S3 bundled. | Pay per AWS service used; starts near $0 at free tier. | Ties you into AWS; hosting DX lags Vercel/Netlify. |
| PlanetScale + Clerk + Upstash | Teams composing best-of-breed SaaS instead of one integrated BaaS. | Roughly $0-$79/mo combined at small scale. | More vendors to manage; no unified dashboard or unified billing. |
Sometimes the honest answer is that this is the wrong comparison.
Both pin you to vendor regions. Self-hosted Supabase helps; Firebase does not. Enterprise-grade residency is usually served by self-hosted Postgres + custom auth.
Firestore's eventual-consistency model and Supabase's managed Postgres both need custom patterns for complex financial reconciliation. A dedicated RDBMS + event store is often safer.
Verified reviews from clients who shipped production systems on stacks we recommended.
Verified reviews from real client engagements — sourced from our public testimonial archive and Clutch profile.
My experience is throughout positive. Communication, service, the short response times and the flawless execution of a challenging topic was absolutely great. ZTABS is definitely my first choice again.
Christian Neff
Bank Software Advisory · Bank Software Advisory
Fintech
Fantastic Agency! I couldn't fault them even if I tried. They always go above and beyond to meet your expectations and always produces quality work. Thank you ZTABS.
Stephanie Kal
CEO · Beauty Finder Australia
Marketplace
It has been great working with ZTABS. They bounce off the ideas along the way. Amazing Experience.
Joel Rowe
CEO · Drill Quoter
Marketplace
We do not just consult on stack choices — we build, run, and maintain production products on these stacks.
We don't just contract — we ship and operate our own software. 17 products in production.
Our senior architects have shipped 500+ projects with both technologies. Get a free consultation — we will recommend the best fit for your specific project.
