Auth0
Okta's hosted identity platform: universal login, social and passwordless sign-in, organizations and enterprise connections.
Free tier
- Free plan: up to 25,000 monthly active users, no credit card to sign up
- Unlimited social connections, passwordless and passkeys
- 1 custom domain, 5 organizations, 1 enterprise connection
Paid plans: Essentials (B2C): from $35/month
Best for
Apps that may later need B2B features like SSO or organizations.
Watch out: Custom domains require credit-card verification even on Free. Paid tiers are priced in MAU steps and you are billed at the next tier up.
Sources
Checked on 2026-11-11. Vendors change pricing often, so confirm on the official page before you commit.