Firebase vs Supabase Pricing Breakdown 2026

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You’re building a new app and you’ve narrowed it down to Firebase or Supabase. You’ve read the feature comparisons. You know Firebase has Firestore and Supabase has Postgres. What you actually need to know is: which one is going to cost you less as you grow — and where are the bills going to blindside you?

I’ve run production workloads on both. I’ve also watched a side project Firebase bill jump from $0 to $140 in a single weekend after a small feature went semi-viral. That experience alone made me take Supabase pricing very seriously. This breakdown is what I wish I’d had before making those decisions.

Quick Verdict: Firebase vs Supabase Pricing in 2026

Firebase Pricing in 2026: What You Actually Pay

Firebase operates on the Spark (free) plan and the Blaze (pay-as-you-go) plan. The Spark plan is permanently free with hard limits. The Blaze plan has a free tier baked in, then charges per usage above that.

Firebase Spark Plan (Free) Limits

• Firestore: 1 GB storage, 50K reads/day, 20K writes/day, 20K deletes/day
• Authentication: Unlimited (phone auth limited to 10 SMS/day in some regions)
• Cloud Functions: Not available on Spark — this is a big one
• Hosting: 10 GB storage, 360 MB/day bandwidth
• Storage: 5 GB, 1 GB/day download
• Realtime Database: 100 simultaneous connections, 1 GB stored, 10 GB/month download

The Spark plan is legitimately good for prototypes and very small apps. But the moment you need Cloud Functions — which you will, for basically anything involving server-side logic, webhooks, or background jobs — you’re forced onto Blaze.

Firebase Blaze Plan (Pay-As-You-Go) Costs

Blaze includes the same free tier as Spark, then you pay above those limits:

• Firestore reads: $0.06 per 100K reads (above 50K/day free)
• Firestore writes: $0.18 per 100K writes (above 20K/day free)
• Firestore deletes: $0.02 per 100K deletes
• Firestore storage: $0.18/GB/month (above 1 GB free)
• Cloud Functions: 2M invocations/month free, then $0.40 per million
• Cloud Functions compute: $0.0000025/GB-second (memory × time)
• Hosting bandwidth: $0.15/GB (above 10 GB/month free)
• Firebase Storage: $0.026/GB stored, $0.12/GB downloaded

The Real Firebase Cost Problem: Firestore at Scale

Here’s where Firebase pricing gets genuinely dangerous. Firestore charges per document read, not per query. If you have a list view that renders 50 items, that’s 50 reads. If 1,000 users open that view in an hour, that’s 50,000 reads in an hour — eating your entire daily free allowance in 60 minutes.

A realistic mid-size app with 5,000 daily active users doing casual browsing can easily rack up 2-5 million Firestore reads per day. At $0.06 per 100K reads, that’s $1.20–$3.00 per day, or $36–$90/month just in reads. Add writes, storage, and Functions compute, and $150–$300/month is not unusual for a moderately active app.

This isn’t hypothetical. The Firebase pricing horror stories on Reddit and Hacker News are real, and they almost always involve Firestore reads getting out of control.

Supabase Pricing in 2026: What You Actually Pay

Supabase uses a tiered subscription model, which is a fundamentally different philosophy from Firebase’s consumption billing.

Supabase Free Plan

• 2 active projects
• 500 MB database storage
• 5 GB bandwidth
• 50K monthly active users (Auth)
• 1 GB file storage
• 500K Edge Function invocations/month
• Projects paused after 1 week of inactivity

The inactivity pause is annoying for hobby projects but not a dealbreaker. The 500 MB storage limit is tight, but for a real app with actual users, you’re going Pro anyway.

Supabase Pro Plan — $25/month per project

• 8 GB database storage (then $0.125/GB)
• 250 GB bandwidth (then $0.09/GB)
• 100K monthly active users (then $0.00325/MAU)
• 100 GB file storage (then $0.021/GB)
• 2M Edge Function invocations (then $2 per million)
• Daily backups, no project pausing
• Email support

$25/month is a fixed floor, not a starting point that balloons. For most indie projects and early-stage startups, you’ll stay right around $25–$40/month. That predictability is worth real money in planning terms.

Supabase Team Plan — $599/month per organization

• Unlimited projects
• Includes $300 compute credits
• SOC 2 compliance, SSO, priority support
• Better for teams managing multiple projects

The jump from $25 to $599 is steep. There’s no middle tier for a single project that’s grown beyond Pro limits but doesn’t need org-level features. This is a genuine gap in Supabase’s pricing ladder.

Supabase Compute Add-ons

By default, your Supabase project runs on a nano compute instance (shared CPU, 0.5 GB RAM). For production apps, you’ll likely want to upgrade:

• Micro: $10/month (2 CPU, 1 GB RAM)
• Small: $25/month (2 CPU, 2 GB RAM)
• Medium: $50/month (2 CPU, 4 GB RAM)
• Large: $100/month (2 CPU, 8 GB RAM)
• XL through 16XL: up to $1,520/month

A production app on Pro + Small compute = $50/month. That’s still very reasonable. And unlike Firebase, a traffic spike doesn’t change your bill — it might slow your app if you’re under-provisioned, but it won’t bankrupt you.

Head-to-Head Pricing Comparison Table

Scenario	Firebase (Blaze)	Supabase (Pro)	Winner
Prototype / zero users	$0 (Spark)	$0 (Free)	Tie
Side project, ~500 DAU	$5–$20/month	$25/month	Firebase (slightly)
Growing app, ~5K DAU	$80–$200/month	$35–$50/month	Supabase
Mid-size app, ~50K DAU	$500–$1,500/month	$75–$150/month	Supabase
Viral traffic spike	Potentially $$$	App slows, bill stays fixed	Supabase
Realtime heavy app	$50–$300/month	$25–$75/month	Supabase
Auth only, 10K MAU	$0 (free tier)	$25/month	Firebase

Hidden Costs Nobody Talks About

Firebase Hidden Costs

1. Cloud Functions cold starts. Not a direct cost, but cold starts push developers to keep Functions warm with scheduled pings — which adds invocation costs and complexity.

2. Egress from Google Cloud. If your app uses Firebase Storage and serves a lot of media, download bandwidth costs add up fast at $0.12/GB.

3. The Blaze requirement for Cloud Functions. You have to add a credit card and enable Blaze just to deploy Functions. This means billing is always live, even if you never intend to exceed free limits. One misconfigured loop and you’re paying.

4. No spending caps on Blaze. Firebase lets you set budget alerts, but there is no hard cap that stops charges. Alerts fire after the fact. This is a real risk for solo developers.

Supabase Hidden Costs

1. Compute upgrades are almost mandatory for production. The default nano instance is genuinely underpowered for anything beyond a demo. Budget an extra $10–$50/month for a real compute tier.

2. Multiple projects = multiple $25/month bills. If you’re running a staging environment plus production, that’s $50/month minimum. Firebase lets you use separate projects on the free tier for staging.

3. Bandwidth can sneak up on you. 250 GB/month sounds like a lot until you’re serving images or large query results. At $0.09/GB overage, it’s manageable but worth watching.

4. The Team plan jump is brutal. If you outgrow Pro but don’t need full org features, you’re stuck either staying on Pro with overages or jumping to $599/month. There’s no $100–$200 middle tier. For self-hosted alternatives that give you more control over this, it’s worth reading our Best Cloud Hosting for Side Projects 2026 guide — sometimes running your own Postgres on a VPS is the right answer at this stage.

The Self-Hosting Wildcard: Supabase vs Firebase

This is where Supabase has an asymmetric advantage that rarely gets discussed in pricing comparisons: you can self-host Supabase for free. The entire stack is open source. If you’re comfortable managing infrastructure, you can run Supabase on a DigitalOcean Droplet or any VPS for $12–$24/month and get essentially unlimited usage.

Firebase is a proprietary Google product. There is no self-hosted Firebase. You are permanently on Google’s pricing, Google’s infrastructure, and Google’s roadmap decisions. For most teams that’s fine, but it’s a lock-in that has real long-term cost implications. We covered a similar lock-in situation in our piece on migrating 14 projects off Heroku — vendor lock-in always costs more than you expect when the time comes to leave.

Use Cases: When to Choose Each

Choose Firebase if:

• You’re building a mobile-first app that needs deep Android/iOS SDK integration. Firebase’s mobile SDKs are still best-in-class.
• You need offline-first data sync. Firestore’s offline capabilities are genuinely excellent and Supabase doesn’t match them yet.
• Your app is tiny and unlikely to scale. Under ~500 DAU with modest reads, Firebase Blaze with the free tier often costs less than Supabase Pro.
• You’re already deep in the Google Cloud ecosystem and want tight integration with BigQuery, Cloud Run, etc.
• You need Firebase Cloud Messaging (push notifications) — it’s still the standard for mobile push, and nothing else is as seamless.

Choose Supabase if:

• You’re building a web app or API and want a real relational database with SQL. Postgres is more powerful than Firestore for complex queries.
• You need predictable billing and can’t afford surprise spikes. Fixed tiers let you budget confidently.
• Your app does heavy reads — SQL queries don’t charge per row read, they charge per query execution time (covered in compute).
• You want to avoid vendor lock-in. Supabase is open source and your data is in standard Postgres — you can migrate anywhere.
• You’re a backend developer who thinks in SQL and wants full database power (joins, views, functions, triggers, RLS policies).
• You’re planning to scale beyond $100/month in backend costs — Supabase almost always wins at that level.

Real-World Cost Scenario: A Social Feed App

Let’s make this concrete. Imagine a simple social app: users post short updates, follow each other, see a feed of recent posts from people they follow. 10,000 monthly active users, average user opens the app 3 times/day, sees 20 posts per feed load.

Firebase (Firestore) math:
10K MAU × 3 opens × 20 reads = 600K reads/day
Free tier: 50K reads/day
Billable reads: 550K/day × 30 = 16.5M/month
Cost: 165 × $0.06 = $9.90/month in reads alone
Add writes (posts, likes), storage, Functions: realistically $40–$80/month total

Supabase math:
Same app on Supabase. Your feed is a SQL JOIN query — one query, not 20 document reads.
Pro plan: $25/month + possibly $10 compute upgrade = $35/month
And that number barely moves as reads increase, because you’re paying for compute time, not row counts.

At 10K MAU, Supabase is already cheaper. At 50K MAU, the Firebase bill multiplies by 5x. The Supabase bill stays at $35–$50/month.

Pricing Summary

Plan	Firebase	Supabase
Free tier	Spark (generous limits, no Functions)	Free (2 projects, pauses on inactivity)
Entry paid	Blaze: $0 + usage	Pro: $25/month flat
Mid-tier	No fixed tier — pure usage	Pro + compute: $35–$125/month
Team / org	Firebase Enterprise (custom pricing)	Team: $599/month
Self-hosted	Not available	Free (open source)
Billing model	Per-operation consumption	Fixed tiers + light overages

Final Recommendation

If you’re asking this question because you’re evaluating where to build your next project, here’s my honest take: Supabase wins the pricing comparison for the vast majority of developers in 2026.

The consumption-based model that makes Firebase feel cheap at the start is the exact thing that makes it expensive at scale. Firestore’s per-read pricing is a structural disadvantage for any app with real user engagement. Supabase’s flat-rate model, combined with the power of Postgres, means your costs are predictable and your queries are efficient by default.

The one scenario where I’d still pick Firebase over Supabase on pure cost grounds: a mobile app with offline sync requirements and under 1,000 DAU that doesn’t need Cloud Functions. In that narrow window, Firebase Spark is unbeatable. Everywhere else, Supabase is the better financial decision.

If you’re already running on Firebase and feeling the billing pain, the migration is more work than a weekend but it’s absolutely worth it — especially if you’re in that 5K–50K DAU range where the cost difference is already hundreds of dollars per month. For context on what a real migration effort looks like, our piece on migrating 14 projects off Heroku covers the mindset and mistakes that apply to any platform switch.

And if you’re evaluating your broader dev tooling stack beyond just backend-as-a-service, check out our AI Tools That Save Developers Time in 2026 — there’s real ROI in the tooling layer that compounds with whatever backend you choose.