Firebase Authentication vs Supabase Auth

Side by side

Firebase Authentication vs Supabase Auth: value, access facts, plan limits and bottom lines

Metric	Firebase Authentication	Supabase Auth
What you're paying for	Worth the priceSign-in that plugs into Firebase and Google Cloud, free to 50,000 monthly users, with SAML at $0.015 per user and a self-serve Google Cloud BAA.	Worth the price100,000 monthly active users on the $25 Pro plan, SSO priced per user, and SOC 2, ISO 27001 and a HIPAA BAA on the self-serve Team plan.
Overall score	8.4	9.3Best
Free option	Free plan	Free plan
Card to start	No card needed	–Not measured
Getting access	Self-serve	Self-serve
Starter priceCheapest paid plan	$0.0055/MAU above 50,000	$25/mo
Pricing model	Usage-based	Usage-based
Pricing page	Public prices	Public prices
Free plan	50,000 MAU; Spark capped at 3,000 a day	50,000 MAU; paused after 1 week inactive
Entry paid plan at 10,000 users	$0 (Blaze), 50,000 MAU at no cost	$25/mo (Pro), 100,000 MAU included
Enterprise SSO	50 SAML/OIDC users free on Blaze, then $0.015 each	50 SSO users on Pro, then $0.015 each
SOC 2 report	SOC 2 (Google), via Compliance Reports Manager	Type 2, on Team ($599/mo)
HIPAA BAA	Google Cloud BAA, accepted in the console	Team plan, paid add-on
Data region	US only	17 AWS regions, EU included
Log retention on the entry paid plan	30 days in Cloud Logging (activity logs, opt-in)	7 days of auth audit logs (Pro)
Bottom line	From its public pages, Firebase Authentication is the least expensive route here to SAML SSO and a self-serve BAA, inside the Firebase platform. Check US-only processing and the protections it does not list.	From its public pages, Supabase Auth is the least expensive per user of the three and the only one with a BAA on a self-serve plan. It fits best when the rest of your app runs on Supabase.

Evidence: Firebase Authentication: facts checked 2026-10-15 from its public sign-up and pricing pages, no completed hands-on run; Supabase Auth: facts checked 2026-10-15 from its public sign-up and pricing pages, no completed hands-on run. Prices in USD as listed, excluding tax. "–" means not recorded.

When to pick each

In the words of each review, with the date its facts were checked.

Entry price

Baseline: each product's cheapest paid plan, per month. Included usage differs, so read the line under each price.

Which one fits

If you need to start today without a sales call

Supabase AuthSelf-serve sign-up; the highest score of the 2 self-serve products here (9.3/10).

If you want to try it without entering a card

Firebase AuthenticationFree plan, no card needed; scored 8.4/10.

Lowest starter price

Supabase Auth$25/mo for the Pro plan. Firebase Authentication lists no comparable paid price.

Highest overall score

Supabase Auth9.3/10 (Excellent). The review shows the score breakdown and the run behind it.

Picked by fixed rules from the table above, not by hand. How we score

Full reviews

• Firebase Authentication review: plans, prices and access facts
• Supabase Auth review: plans, prices and access facts

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