Firebase vs Supabase(2026)
Firebase is better for teams that need real-time sync out of the box. Supabase is the stronger choice if full postgres with sql. Firebase is freemium (from $25/month) and Supabase is freemium (from $25/month).
Full feature breakdown, pricing details, and pros & cons below.
By Bikram NathLast updated
Affiliate disclosure: Some “Visit” links on this page are affiliate links. We may earn a commission if you sign up — at no extra cost to you. It does not affect our rankings or editorial coverage. Learn more.
Firebase
Firebase is Google's app development platform with realtime database, Firestore, auth, hosting, and cloud functions.
Starting at $25/month
Visit FirebaseSupabase
Supabase is an open source Firebase alternative providing a Postgres database, Auth, realtime, storage, and edge functions.
Starting at $25/month
Visit SupabaseHow Do Firebase and Supabase Compare on Features?
| Feature | Firebase | Supabase |
|---|---|---|
| Pricing model | freemium | freemium |
| Starting price | $25/month | $25/month |
| Firestore (NoSQL) | ✓ | — |
| Realtime Database | ✓ | — |
| Authentication | ✓ | ✓ |
| Cloud Functions | ✓ | — |
| Hosting | ✓ | — |
| Storage | ✓ | ✓ |
| App Check | ✓ | — |
| PostgreSQL | — | ✓ |
| Realtime | — | ✓ |
| Edge Functions | — | ✓ |
| Auto-generated APIs | — | ✓ |
Firebase Pros and Cons vs Supabase
Firebase
Supabase
Deep dive: Firebase
When to choose Firebase
Choose Firebase if you're building a real-time collaborative app (Figma-like, live polling, chat) and want backend complexity handled by Google. Also ideal if you're starting a mobile app and need SDK convenience (auth, push notifications, analytics). Real-time Firestore sync is genuinely hard to replicate manually—handling subscriptions, conflict resolution, and multi-client consistency requires weeks of engineering. Great for small teams without backend expertise who just want to ship fast. Firebase is wrong if you need complex transactions, want control over data location/compliance, need to optimize costs (Firebase becomes expensive at moderate scale—$1k+/month quickly), or plan to outgrow it. Vendor lock-in is real; exporting Firestore data to Postgres is manual and lossy. Also wrong if you need SQL-like joins or plan to run complex analytics queries. Firestore forces denormalization, and backfilling denormalized copies when source data changes is tedious. Teams with strict GDPR requirements or data residency needs should avoid Firebase.
Real-world use case
A team of 2 built a collaborative whiteboard app using Firebase, needing real-time sync of canvas changes across 5+ concurrent users. On traditional Postgres + WebSockets, this would've been 2-3 weeks of engineering (managing subscriptions, conflict resolution). With Firebase Firestore's real-time listeners, every pen stroke synced to all users within 200ms; conflicts resolved automatically. Cost: $0 first month (free tier), then $150/month at peak (3k concurrent draws/day). Real numbers: they hit Firebase's default concurrent connection limit (100) at only 45 simultaneous users, forcing an upgrade. Real tradeoff: when adding a 'comments' feature, Firestore's lack of joins forced them to duplicate user names in every comment doc. Later, redesigning the user profile meant manually updating 10k comments—something a single SQL UPDATE would've solved in 50ms. They chose Firebase over building WebSocket infrastructure because the time savings were critical; reaching production in 5 days vs. 4 weeks justified the eventual cost.
Hidden gotchas
Billing is per read, write, and delete operation. A single document change counts as 1 write. If 100 users listen to the same document via real-time listeners and it changes once, that's 100 reads billed instantly. At scale, this becomes insanely expensive—a busy chatroom can rack up $500+ in daily read costs from a single change. Firestore's 'eventually consistent' reads return stale data. Google downplays this in docs, but writes to one region aren't instantly visible in another, leading to subtle race conditions in production that are nearly impossible to debug. Exporting data from Firebase is manual and incomplete. There's no built-in export-to-CSV for large datasets. Nested documents (e.g., user { profile { address } }) flatten awkwardly when exported. Authentication ties you to Google's OAuth/email systems; migrating to a different provider later is a months-long project because auth is baked into client SDKs. The free tier has a 1GB storage limit enforced harshly—one day you're building freely, the next day you get a quota-exceeded error. Google doesn't warn when approaching limits. Subcollections are stored differently than top-level collections, causing unexpected billing surprises. Array operations (adding one element to a 1k-element array) require reading and writing the entire array—performance scaling is nonlinear.
Pricing breakdown
Firebase's free Spark plan includes 1 GB Firestore storage, 50K reads/day, 20K writes/day, and 10 GB hosting bandwidth. The Blaze (pay-as-you-go) plan charges $0.06 per 100K reads, $0.18 per 100K writes, and $0.18/GB storage. Realtime Database is $5/GB stored and $1/GB downloaded. The real cost shock comes from Firestore reads — a poorly optimized query that reads 100 documents per page view can cost $150+/mo at 50K daily users. Cloud Functions are billed at $0.40 per million invocations plus compute time. A typical mobile app backend costs $20-100/mo on Blaze.
Deep dive: Supabase
When to choose Supabase
Choose Supabase if you're building modern applications that need real-time features (live collaboration, chat, notifications), PostgreSQL SQL queries, and built-in auth without Firebase's vendor lock-in. It's ideal for startups and solo devs—the free tier is genuinely useful: 500MB database, 1GB file storage, and 50K monthly auth events. The open-source architecture means you can self-host if Supabase ever becomes too expensive or unreliable. Supabase is the WRONG choice for static sites, simple blogs, or projects that don't need a database—you're overpaying for a data engine. The free tier has gotchas: projects pause after 1 week of inactivity, so it's not suitable for production apps unless you pay. Edge functions are limited (Node.js-only, limited dependencies), so if you need Python or heavy compute, look at Vercel or Lambda. Real-time subscriptions are great for user-facing features but add complexity and can get expensive at scale ($4/month per 1M realtime events).
Real-world use case
A founder built a real-time collaborative whiteboard app using Supabase's free tier: PostgreSQL for drawing data, auth for user management, and realtime subscriptions for live syncing. Development took 3 weeks because Supabase's JavaScript client made auth + database + realtime easy. Launch day: 200 beta users, freemium model (5 boards per user, pay $5/month for unlimited). Month 1 costs: $0 (free tier). Month 2: traffic exceeded free tier limits (database grew to 600MB); upgraded to Pro ($25/month). At 500 paid users ($5/month each), revenue was $2,500/month; Supabase cost was $25/month. The pricing math worked beautifully. If she'd used Firebase, vendor lock-in would've been higher, and Postgres SQL flexibility would've been lost. The real-time feature (10K concurrent users syncing) cost her an extra $200/month in realtime events by month 6, but that was still <1% of revenue.
Hidden gotchas
Supabase's free tier pauses projects after 7 days of inactivity—projects are frozen, databases reset, and cold starts hurt. Many developers are shocked to find their free project gone after a vacation. Pro tier pricing ($25/month) includes 500K realtime events; overages are $0.04 per 100K events—a popular app hits $500+ in surprise overages. Database backups on free tier are limited to the last 7 days; Pro tier gets 30 days. Restore operations aren't self-service; they require support tickets. Self-hosting Supabase is documented but complex: you need Docker, Kubernetes, and 2+ hours of setup. The authentication defaults are opinionated—if you need SAML, LDAP, or non-standard OAuth flows, you'll hit limitations. Edge functions (Deno-based) have strict limits: 10 second timeout, no native PostgreSQL connection pooling, and dependency issues (some npm packages won't work). Row-level security (RLS) is powerful but has a learning curve; misconfigured policies silently fail, returning empty rows instead of errors. Realtime subscriptions aren't designed for high-frequency updates (>100Hz); you'll hit performance cliffs. Rate limiting for APIs isn't clearly documented; high-concurrency apps might get throttled unexpectedly. Cold starts on edge functions are 1-2 seconds, much slower than Vercel.
Pricing breakdown
Supabase's free plan includes 500 MB database, 1 GB file storage, 50 MB bandwidth, and 500K Edge Function invocations. The Pro plan at $25/mo adds 8 GB database, 100 GB file storage, and 250 GB bandwidth. Beyond included limits: database is $0.125/GB, bandwidth is $0.09/GB, storage is $0.021/GB. At moderate scale (50K MAU, 20 GB database), expect $40-80/mo. The advantage: Postgres + Auth + Storage + Edge Functions bundled at roughly 60% the cost of running separate services. The cost trap: database compute is tied to your plan tier — CPU-heavy queries on the free/Pro plans hit performance ceilings.
Should You Use Firebase or Supabase?
For most teams, Firebase is the better default: it offers real-time sync out of the box and is freemium (from $25/month). Choose Supabase instead if full postgres with sql matters more than vendor lock-in. There is no universal winner — the right pick depends on your budget, team size, and whether you value real-time sync out of the box or full postgres with sql more.
Choose Firebase if…
- •Real-time sync out of the box
- •Complete backend platform
- •Excellent mobile SDKs
Choose Supabase if…
- •Full Postgres with SQL
- •Built-in auth and storage
- •Open source