Best Free Auth Tools

Seamless Integration of SSO, MFA, passwordless auth and more. Includes SDKs for frontend and backend apps. Free tier: 7,500 Consumer MAUs (B2C), 250 B2B MAUs, 2 social login providers. When we last read the page we cite for this offer, on 2026-10-31, we found a change we could not reconcile with the terms we publish, so we cannot confirm these terms today.

• −1 stale_verification Our last read of the vendor's pricing page, on 2026-10-31, found the page different from the terms we hold. This is our confidence in the record, not a change by the vendor. (a limit of ours, not a change by the vendor)

Free OSS (Apache 2.0). Red Hat-backed identity and access management. SSO, OIDC, SAML, LDAP, social login, MFA, fine-grained authorization. Self-hosted with no user limits. The page we cite for this offer states no amount, tier or rate we can read when we last looked, on 2026-10-09, so we cannot confirm these terms today.

• −1 stale_verification Our last read of the vendor's pricing page, on 2026-10-09, could read no amount, tier or rate on the page. This is our confidence in the record, not a change by the vendor. (a limit of ours, not a change by the vendor)

Developer authentication via Auth0 platform — 25,000 MAU free, social login, passwordless, MFA, SSO. Note: developer.okta.com/signup now routes to Auth0. When we read the page we cite for this offer on 2026-10-06, we found the same terms as an earlier read we had declined to record, and we have read it again since, on 2026-10-31, without confirming the terms above, so we cannot confirm these terms today.

• −1 stale_verification We cannot confirm this offer: 1 consecutive re-check attempt has failed (most recently 2026-10-31 — The provided text does not contain pricing information or details about free tiers, making it impossible to verify the stored deal information. It only contains links and copyright information.), never confirmed since it was indexed. This is our inability to verify, not a change by the vendor. (a limit of ours, not a change by the vendor)

Two-factor authentication (2FA) on multiple devices, with backups. Drop-in replacement for Google Authenticator. Free for up to 100 successful authentications. The page we cite for this offer states no amount, tier or rate we can read when we last looked, on 2026-10-11, so we cannot confirm these terms today.

• −1 stale_verification Our last read of the vendor's pricing page, on 2026-10-11, could read no amount, tier or rate on the page. This is our confidence in the record, not a change by the vendor. (a limit of ours, not a change by the vendor)

Open-source identity infrastructure — The 'Developer' tier is free, includes 1 member, 0 production environments, 2 development environments, and no included monthly credit.

• −1 stale_verification Our last read of the vendor's pricing page, on 2026-10-24, found the page different from the terms we hold. This is our confidence in the record, not a change by the vendor. (a limit of ours, not a change by the vendor)

Keycloak Identity and Access Management as a Service. Free up to 100 users and one realm.

• −1 stale_verification We cannot confirm this offer: 4 consecutive re-check attempts have failed (most recently 2026-11-08 — The pricing page text is truncated and does not include the actual pricing tiers or free-tier details (user limits, realm limits, or plan names), so the stored free-tier info cannot be verified.), never confirmed since it was indexed. This is our inability to verify, not a change by the vendor. (a limit of ours, not a change by the vendor)

Identity platform — 25K MAU (B2C), unlimited logins, social + database connections, Universal Login, 1 Enterprise Connection, 5 Organizations, 1 Custom Domain. No credit card required

• Using the Free plan's custom domain requires a valid credit card on file for verification and fraud prevention. Auth0 does not charge it. (From auth0.com/docs/customize/custom-domains, read 2026-10-08.)

• −1 stale_verification Our last read of the vendor's pricing page, on 2026-11-01, found the page different from the terms we hold. This is our confidence in the record, not a change by the vendor. (a limit of ours, not a change by the vendor)

Fine-grained authorization as a service for applications and APIs. Free up to 1000 MAUs and 100 authorizer instances. The page we cite for this offer states no amount, tier or rate we can read when we last looked, on 2026-10-11, so we cannot confirm these terms today.

• −1 stale_verification Our last read of the vendor's pricing page, on 2026-10-11, could read no amount, tier or rate on the page. This is our confidence in the record, not a change by the vendor. (a limit of ours, not a change by the vendor)

A complete authorization management system for authoring, testing, and deploying access policies. Fine-grained authorization and access control, free up to 100 monthly active principals. When we last read the page we cite for this offer, on 2026-10-24, we found a change we could not reconcile with the terms we publish, so we cannot confirm these terms today.

• −1 stale_verification Our last read of the vendor's pricing page, on 2026-10-24, found the page different from the terms we hold. This is our confidence in the record, not a change by the vendor. (a limit of ours, not a change by the vendor)

Managed Keycloak hosting with Phase Two's Organization extension. No free tier since 2026-07-30, when Phase Two shut down its free shared realms. The Starter cluster is $149/month after a 30-day free trial; users are unlimited, and it is sized for 5,000 active users a month. Note — 2026-07-30: Phase Two shut down its free shared realms on 2026-07-30, 30 days after announcing it on 2026-06-30. Its cheapest plan is now the Starter cluster at $149 a month, with a 30-day free trial. Source ↗

• −3 free_tier_withdrawn Recorded free tier removal on 2026-07-30: Phase Two shut down its free shared realms on 2026-07-30, 30 days after announcing it on 2026-06-30. Its cheapest plan is now the Starter cluster at $149 a month, with a 30-day free trial. Source: https://phasetwo.io/blog/starter-tier-launch/
• −2 time_limited_offer Tier "Trial" is a trial that expires, not an ongoing free tier.