Best Free Auth Tools

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. The page we cite for this offer states no amount, tier or rate we can read when we last looked, on 2026-09-02, so we cannot confirm these terms today.

• −1 stale_verification Our last read of the vendor's pricing page, on 2026-09-02, 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)

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 2026-09-02, so we cannot confirm these terms today.

• −1 stale_verification Our last read of the vendor's pricing page, on 2026-09-02, 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)

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 Best for open source projects. The page we cite for this offer states no amount, tier or rate we can read when we last looked, on 2026-09-02, so we cannot confirm these terms today.

• −1 stale_verification Our last read of the vendor's pricing page, on 2026-09-02, 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)

Bring Passwordless, OTPs, 2FA, SSO to your apps in minutes. All Front-end included. Free tier: unlimited MAUs, up to 2 applications, 100 SMS/month. Best for unlimited usage needs. The page we cite for this offer states no amount, tier or rate we can read when we last looked, on 2026-09-02, so we cannot confirm these terms today.

• −1 stale_verification Our last read of the vendor's pricing page, on 2026-09-02, 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)

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 2026-09-02, so we cannot confirm these terms today.

• −1 stale_verification Our last read of the vendor's pricing page, on 2026-09-02, 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)

Two-factor authentication (2FA) by push notifications, free for 3 users, VPN, Websites, and SSH. The page we cite for this offer states no amount, tier or rate we can read when we last looked, on 2026-09-02, so we cannot confirm these terms today.

• −1 stale_verification Our last read of the vendor's pricing page, on 2026-09-02, 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)

Now Hexclave — stack-auth.com redirects to hexclave.com, and the GitHub org stack-auth/stack-auth redirects to hexclave/hexclave (same repository). Open-source user infrastructure: auth, teams, RBAC, API keys, emails. Free tier is $0 forever: up to 10,000 auth users, 1 dashboard admin, 1,000 emails per month, email/OAuth/magic links, community support. Also self-hostable for free. The page we cite for this offer does not name it when we last looked, on 2026-09-14, so we cannot confirm these terms today.

• −1 stale_verification We cannot confirm this offer: 2 consecutive re-check attempts have failed (most recently 2026-09-14 — the page never names Stack Auth and is not served from its domain), 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)

Authentication for B2B SaaS — free up to 10,000 MAUs and 10K Transactional Emails (with a watermark branding: "Powered by PropelAuth"). The page we cite for this offer states no amount, tier or rate we can read when we last looked, on 2026-09-02, so we cannot confirm these terms today.

• −1 stale_verification Our last read of the vendor's pricing page, on 2026-09-02, 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 turnkey user and access management that works for you and supports multi-tenant (B2B) use cases. Free for up to 100 Daily Active Users, with all security features (no paywall for OTP, Passwordless, Policies, and so on). The page we cite for this offer states no amount, tier or rate we can read when we last looked, on 2026-09-02, so we cannot confirm these terms today.

• −1 stale_verification Our last read of the vendor's pricing page, on 2026-09-02, 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)

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

• −1 stale_verification We cannot confirm this offer: 1 consecutive re-check attempt has failed (most recently 2026-09-19 — The pricing page does not explicitly mention a free tier with the stated limits (100 users and one realm). It broadly mentions 'Start for free' and 'Deploy a secured Keycloak now' but does not detail the specifics of a free tier. The page focuses on managed Keycloak solutions with SLAs and enterprise features, and emphasizes contacting them for pricing or using a cost calculator. It's unclear if the original free tier still exists or if it has been altered.), 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)

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 with a 30-day free trial, for up to 15K monthly active users. 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.