Firebase Authentication pricing

• Hard capSpark (no-cost) stops at its limits rather than billing more.

At the limit

Needs an upgrade past the limit

Limits

• Monthly active users: 50K users a monthEmail, social and anonymous sign-in

• No payment method needed. Phone sign-in is not available on Spark.
• SAML and OIDC sign-in are free only up to 50 monthly active users.
• Past 50,000 users you upgrade to the Blaze plan with Identity Platform.

Source: firebase.google.com · checked 19 October 2026

At the limit

Bills for extra usage

Usage pricing

• Monthly active users: $0.0055 per user (above 50K users, up to 100K users)
• Monthly active users: $0.0046 per user (above 100K users, up to 1M users)
• Monthly active users: $0.0032 per user (above 1M users, up to 10M users)
• Monthly active users: $0.0025 per user (above 10M users)

• The first 50,000 active users a month are free. Any account that signs in during the month counts once; inactive users cost nothing.
• Phone and multi-factor sign-in are billed per SMS sent and are not in this estimate.
• SAML and OIDC users use a separate, higher price tier that is not in this estimate.

Source: cloud.google.com · checked 19 October 2026