Free Tier Tracker

Home › Alternatives › Firebase Authentication

Free Firebase Authentication Alternatives

Looking for something other than Firebase Authentication? These 7 auth services also have a free tier. Limits come from each vendor's own pricing page; click a date to check the source. Last updated 13 Nov 2026.

Firebase Authentication Free Tier (For Reference)

ServiceFree limitsCatchChecked
Firebase Authentication
Free tier
  • MAU50,000
  • SAML/OIDC MAU50
  • Phone authBilled per SMS
—12 Nov 2026

7 Free Alternatives

ServiceFree limitsCatchChecked
Clerk (Hobby)
Free tier
  • Monthly retained users50,000 per app
  • ApplicationsUnlimited
  • Dashboard seats3
  • Session lifetimeFixed 7 days
  • Log retention1 day
Hobby: up to 3 social connections, no MFA or passkeys; one-month grace period if you go above 50K MRU.13 Nov 2026
Auth0 (Free)
Free tier
  • MAU25,000
  • Custom domains1 (card verification)
  • Organizations5
  • Enterprise connections1
  • Social connectionsUnlimited
—6 Nov 2026
Stytch
Free tier
  • MAU (users + AI agents)10,000
  • SSO/SCIM connections5
  • M2M tokens1,000
  • OrganizationsUnlimited
—9 Nov 2026
WorkOS AuthKit
Free tier
  • Active usersFirst 1 million free
SSO/directory sync are priced separately; each additional 1M users is $2,500/mo.9 Nov 2026
Kinde (Free)
Free tier
  • MAU10,500
  • Custom domainYes
  • MFAIncluded
If you bill your customers through Kinde there is a 0.7% per-transaction fee; Free includes 1 webhook and 2 environments (production and development).5 Nov 2026
Cloudflare Turnstile (Free)
Free tier
  • WidgetsUp to 20
  • ChallengesUnlimited
  • Hostnames10 per widget
  • Analytics lookback7 days
A CAPTCHA alternative for bot checks on forms and logins, not a user login system. Any-hostname widgets and removing Cloudflare branding are Enterprise only.9 Nov 2026
Logto Cloud (Free)
Free tier
  • MAU50,000
  • Access tokens50,000 / month
  • Applications3
  • Machine-to-machine apps1
  • Social connectors3
  • Custom domains1
No MFA, organizations (multi-tenancy), enterprise SSO or RBAC on Free; those are Pro add-ons. Pro starts at $24/month with 50K tokens included, then $0.08 per 100 extra tokens. Open-source core can be self-hosted.12 Nov 2026

FAQ

What are the best free alternatives to Firebase Authentication?

7 other auth services with a permanent free tier are tracked here: Clerk, Auth0, Stytch, WorkOS AuthKit, Kinde, Cloudflare Turnstile, Logto Cloud. Each limit is copied from the vendor's pricing page and dated.

Does Firebase Authentication itself have a free tier?

Yes: MAU 50,000; SAML/OIDC MAU 50; Phone auth Billed per SMS. Last checked 12 Nov 2026.

How do I pick a free Firebase Authentication alternative?

Start with the limit your app will hit first (for example requests, storage, emails or users), then read each service's catch. The table on this page shows both for every alternative.

See all auth free tiers or the head-to-head comparisons.