Free Tier Tracker

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Free auth tiers compared

6 services. Limits as published by each vendor; click the date to open the source.

ServiceFree limitsCatchChecked
Clerk (Hobby)
Free tier
  • Monthly retained users50,000 per app
  • ApplicationsUnlimited
  • Dashboard seats3
  • Session lifetimeFixed 7 days
  • Log retention1 day
—15 Oct 2026
Auth0 (Free)
Free tier
  • MAU25,000
  • Custom domains1 (card verification)
  • Organizations5
  • Enterprise connections1
  • Social connectionsUnlimited
—15 Oct 2026
Stytch
Free tier
  • MAU (users + AI agents)10,000
  • SSO/SCIM connections5
  • M2M tokens1,000
  • OrganizationsUnlimited
—15 Oct 2026
WorkOS AuthKit
Free tier
  • Active usersFirst 1 million free
SSO/directory sync are priced separately.15 Oct 2026
Kinde (Free)
Free tier
  • MAU10,500
  • Custom domainYes
  • MFAIncluded
—15 Oct 2026
Firebase Authentication
Free tier
  • MAU50,000
  • SAML/OIDC MAU50
  • Phone authBilled per SMS
—15 Oct 2026