Which is cheaper for about 1,000 monthly users?

Supabase costs $24.40 more a month than Firebase. Supabase comes to about $45.87 a month and Firebase to about $21.47, before tax.

And at 100,000 monthly users?

Firebase is cheaper: about $515 a month against $595. Usage-based charges grow with traffic, so the gap can change as you grow.

When does the first plan change happen?

In Supabase, Supabase moves from Free to Pro ($25.00 a month) at 51 users (limit: 1 GB of file storage). In Firebase, Firebase Firestore moves from Spark (free quota) to Blaze (pay as you go) ($0 a month) at about 200 users (limit: 1 GB of database storage).

Where do these prices come from?

Every price is read from each provider's own pricing page and was checked between 18 October 2026 and 19 October 2026. Usage is estimated from simple per-user averages that you can change in the builder. These are estimates, not quotes.

Supabase vs Firebase for a web app with logins

A web app with logins on Supabase or on Firebase (Firestore and Firebase Authentication): monthly cost as you grow and where each free tier ends.

Updated 22 October 2026 · prices from each provider's own page

Supabase gives you a hosted Postgres database with logins and file storage in one service. Firebase is Google's pair of products for the same job: Firestore, a document database with a daily free quota and pay-per-read and write pricing, and Firebase Authentication, free up to 50,000 monthly active users. The two stacks below share the same domain, hosting and email, so the difference is the database and logins.

At growing, about 1,000 people a month

Supabase costs $24.40 more a month than Firebase.

Supabase

$45.87 a month

$550 a year, before tax

Firebase

$21.47 a month

$258 a year, before tax

Change the scale or add tax Open Supabase in the builder Open Firebase in the builder

Part by part

Service prices are before tax.

Part	Supabase	Firebase
Domain	Cloudflare Registrar.com$0.87/mo	Cloudflare Registrar.com$0.87/mo
Website hosting	Cloudflare PagesFree$0/mo	Cloudflare PagesFree$0/mo
Database	SupabasePro$25.00/mo	Firebase FirestoreBlaze (pay as you go)$0.60/mo
Login	Included with Supabase	Firebase AuthenticationSpark (no-cost)$0/mo
Email	ResendPro 50K$20.00/mo	ResendPro 50K$20.00/mo
Total	$45.87/mo	$21.47/mo

As you grow

People a month	Supabase	Firebase
10	$0.87	$0.87
100	$25.87	$0.87 (cheaper)
1,000	$45.87	$21.47 (cheaper)
10,000	$66.75	$30.77 (cheaper)
100,000	$595	$515 (cheaper)

The cheaper stack at each size is in bold.

Supabase: first plan change

Supabase at 51 users. The free plan ends. Next: Pro at $25.00/mo.

Limit reached: 1 GB of file storage.

Firebase: first plan change

Firebase Firestore at about 200 users. The free plan ends. Next: Blaze (pay as you go) at $0/mo.

Limit reached: 1 GB of database storage.

Questions

Which is cheaper for about 1,000 monthly users?: Supabase costs $24.40 more a month than Firebase. Supabase comes to about $45.87 a month and Firebase to about $21.47, before tax.
And at 100,000 monthly users?: Firebase is cheaper: about $515 a month against $595. Usage-based charges grow with traffic, so the gap can change as you grow.
When does the first plan change happen?: In Supabase, Supabase moves from Free to Pro ($25.00 a month) at 51 users (limit: 1 GB of file storage). In Firebase, Firebase Firestore moves from Spark (free quota) to Blaze (pay as you go) ($0 a month) at about 200 users (limit: 1 GB of database storage).
Where do these prices come from?: Every price is read from each provider's own pricing page and was checked between 18 October 2026 and 19 October 2026. Usage is estimated from simple per-user averages that you can change in the builder. These are estimates, not quotes.