Choose Supabase if: You want a full BaaS without Firestore's NoSQL constraints Your data model needs relational SQL — foreign keys, JOINs, complex queries You want auth, storage, and real-time in one platform with no vendor lock-in You might want to self-host in the future (Supabase is fully open source) Choose Firebase if: You're building a mobile app (Android/iOS) with offline support requirements Real-time sync is core to your UX (collaborative tools, live feeds, chat) You need the deepest SD

Supabase vs Firebase vs Neon 2026

TL;DR

Supabase wins for teams that want a full BaaS on PostgreSQL — auth, real-time, storage, and Edge Functions in one platform with no vendor lock-in on data. Firebase wins for mobile apps and teams that need Firestore's real-time sync — the Android/iOS SDK depth, FCM push notifications, and offline support remain unmatched. Neon wins for teams that just want a serverless PostgreSQL database — it's not a BaaS, but its branching model, autoscaling to zero, and generous free tier make it the best standalone Postgres in 2026. Don't compare Neon directly to Firebase; compare it to PlanetScale or Supabase's database layer only.

Key Takeaways

Supabase free tier: 500MB database, 1GB storage, 50MB file uploads, 50,000 MAUs auth
Firebase free tier: 1GB Firestore storage, 10GB/month transfers, 125K Auth verifications/month
Neon free tier: 0.5GB storage, unlimited projects, compute pauses when idle
Supabase database: PostgreSQL (full SQL, foreign keys, joins, extensions)
Firebase database: Firestore (NoSQL, document-collection, real-time)
Neon database: PostgreSQL with branching and autoscale-to-zero

Pricing Deep Dive

Supabase

Plan	Price	Database	Auth MAUs
Free	$0	500MB	50,000
Pro	$25/month	8GB (then $0.125/GB)	100,000 (then $0.00325/MAU)
Team	$599/month	Custom	Custom

Supabase Pro at $25/month is one of the best value tiers in the BaaS market — you get 8GB Postgres, 100K MAUs, 100GB bandwidth, and 5GB file storage. Overages are predictable: $0.125/GB for database, $0.09/GB for bandwidth.

Firebase

Firebase pricing is usage-based and can be hard to predict:

Resource	Free (Spark)	Paid (Blaze)
Firestore reads	50K/day	$0.06/100K
Firestore writes	20K/day	$0.18/100K
Firestore storage	1GB	$0.18/GB/month
Auth verifications	125K/month	Phone: $0.0055/verification
Bandwidth	10GB/month	$0.12/GB

Firebase's pay-as-you-go model (Blaze plan) can surprise growing apps. A startup with 10K DAU making 5 Firestore reads per session burns ~1.5M reads/day — that's ~$0.90/day or $27/month just in reads, before writes, storage, or Functions.

Neon

Plan	Price	Storage	Compute
Free	$0	0.5GB	0.25 vCPU, pauses after inactivity
Launch	$19/month	10GB	Up to 4 vCPU, auto-suspend
Scale	$69/month	50GB	Up to 8 vCPU, multiple compute
Business	$700/month	Custom	Dedicated

Neon charges for compute-hours — if your database is idle (no queries for 5 minutes by default), it scales to zero and you stop paying. This makes Neon exceptionally cheap for side projects and staging environments: a typical dev database costs $0–$5/month.

Database Model

This is the fundamental fork in the road.

Supabase and Neon both use PostgreSQL. This means:

Full SQL, JOINs, transactions, and foreign keys
200+ extensions including pgvector, PostGIS, and pg_cron
No vendor-specific query language — your SQL runs on any PostgreSQL
Row Level Security for access control at the database layer

Firebase's Firestore is a NoSQL document database:

Data organized as collections of documents (JSON-like)
No JOINs — data must be denormalized or fetched in multiple rounds
Real-time listeners natively built into the SDK
Queries limited to defined indexes (no ad-hoc complex queries)
Excellent for hierarchical data like chat messages, user feeds, or activity logs

The choice between SQL and NoSQL is often the deciding factor. If your data has complex relationships (orders → line items → products → inventory), PostgreSQL wins. If your data is naturally hierarchical and real-time sync is core to the UX (collaborative apps, live feeds), Firestore is worth the tradeoffs.

Authentication

All three platforms include auth, but the depth varies significantly.

Supabase Auth is built on GoTrue (open source) and supports email/password, magic links, OAuth (Google, GitHub, Apple, etc.), and phone/SMS. Row Level Security integrates directly with auth — you can write Postgres policies like auth.uid() = user_id that enforce access control at the database layer. This is architecturally cleaner than application-level auth checks.

Firebase Authentication is the most feature-rich mobile auth solution. It handles email/password, social OAuth, phone SMS, anonymous auth, and custom tokens. The native Android/iOS SDKs handle token refresh, offline state, and re-authentication flows automatically. For web-only apps, the advantage narrows; for mobile-first apps, Firebase Auth's SDK depth is a genuine moat.

Neon has no built-in auth — it's a database, not a BaaS. You pair it with Clerk, Auth.js, or any auth solution you choose. This is a feature, not a bug: you're not locked into Neon's auth model, and you can use the best auth tool for your framework.

Real-Time Capabilities

Firebase Firestore is built from the ground up for real-time sync. Every document can have a real-time listener — changes propagate to connected clients instantly, and the offline SDK caches data and queues writes for when connectivity is restored. This is Firestore's killer feature, particularly for mobile apps.

Supabase Realtime uses PostgreSQL's logical replication to stream database changes to clients. It works well for basic real-time use cases — live dashboards, presence indicators, collaborative UIs. It's less battle-tested than Firestore for complex offline/sync scenarios on mobile.

Neon has no real-time features — you'd add a separate pub/sub layer (Redis, Upstash, or Pusher) if you need live updates.

Developer Experience and Ecosystem

Supabase's DX has improved dramatically since 2024. The JavaScript client library is clean, the auto-generated TypeScript types from your schema are a major productivity win, and the Supabase dashboard is genuinely pleasant to use. The open-source nature means you can self-host everything — important for compliance or cost reasons at scale.

Firebase's DX is mature and well-documented after years of Google investment. The Firebase console is feature-rich, emulators for local development are solid, and the ecosystem of guides and Stack Overflow answers is vast. The pain points: Firebase's Google Cloud coupling creates unexpected billing surprises, and migrating away from Firebase is painful due to Firestore's proprietary query model.

Neon's DX is excellent for a database-focused product. The branching feature is transformative for development workflows — you can branch your production database for a staging environment in seconds, run migrations against a branch, and merge or discard it. The Neon console is clean, and the psql-compatible connection string means any PostgreSQL client works out of the box.

When to Use Which

Choose Supabase if:

You want a full BaaS without Firestore's NoSQL constraints
Your data model needs relational SQL — foreign keys, JOINs, complex queries
You want auth, storage, and real-time in one platform with no vendor lock-in
You might want to self-host in the future (Supabase is fully open source)

Choose Firebase if:

You're building a mobile app (Android/iOS) with offline support requirements
Real-time sync is core to your UX (collaborative tools, live feeds, chat)
You need the deepest SDK support for mobile platforms
Your team is already in the Google Cloud ecosystem

Choose Neon if:

You want the best serverless PostgreSQL without full BaaS overhead
You need database branching for complex dev/staging/production workflows
Cost per idle database hour matters — Neon scales to zero automatically
You're building on a framework that pairs better with a standalone database (Prisma, Drizzle)

The SaaS Tool Evaluation Guide (Free PDF)