Auth0 free tier too limited? Compare free authentication alternatives: Clerk, WorkOS, Supabase Auth, Firebase Auth, Logto, FusionAuth, Keycloak, and more. Catalogue dates August to September 2026.

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Auth0 Alternatives

Auth0 is a powerful identity platform, but its pricing is one of the steepest cliffs in developer tools. The free tier gives you 25K MAU — generous for prototyping. But the moment you outgrow it, B2C paid plans start with Essentials at $35 a month for 500 MAU, and Professional at $240 a month; B2B plans start at $150.

The pricing pain is compounded by complexity. Auth0's tenant model, rule/action system, and connection limits create billing surprises. Teams regularly discover they need features (SSO, MFA customization, branding removal) that are locked behind higher tiers. "Auth0 alternatives" remains one of the most consistently searched developer queries.

The authentication landscape in 2026 offers real competition. Managed platforms (Clerk, WorkOS, Stytch) provide modern DX with generous free tiers. Open-source solutions (Keycloak, FusionAuth, Ory, Logto) give you unlimited users when self-hosted. And BaaS platforms (Supabase, Firebase) include auth as part of a broader free tier. The right choice depends on whether you prioritize DX, cost, or control.

Limits Increased

Auth0 increased free tier from 7,500 to 25,000 monthly active users. Largest free tier expansion since Okta acquisition. Makes Auth0 competitive with Clerk and Firebase Auth on free tier Source ↗

Before: Free tier: 7,500 MAU, unlimited social connections, 2 organizations
After: Free tier: 25,000 MAU (+233%), unlimited social connections, 5 organizations. Actions, Branding, MFA included

Top Alternatives

Supabase Free stable

Postgres development platform: database, Auth, Storage, Realtime and Edge Functions. The Free plan is $0: unlimited API requests, 50,000 monthly active users, a 500 MB database on a shared CPU with 500 MB RAM, 5 GB egress plus 5 GB cached egress, 1 GB file storage, 500,000 Edge Function invocations, and Realtime with 200 concurrent connections and 2 million messages a month. Free projects are paused after 1 week of inactivity, with a limit of 2 active projects. Pro starts at $25 a month for the first project and includes $10 a month of compute credits, enough for one Micro instance.

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Firebase Spark stable

Spark plan, no payment method needed: Auth (50K MAU), Firestore (1 GiB stored, 50K reads/day, 20K writes/day, 20K deletes/day), Hosting (10 GB storage, 360 MB/day transfer), and no-cost Analytics, Crashlytics and Cloud Messaging. Cloud Functions and Cloud Storage need the Blaze plan.

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Clerk Hobby stable

Drop-in auth with 50K monthly retained users free, unlimited apps

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Kinde Free stable

10,500 MAU, OAuth 2.0/OIDC/SAML, MFA (email/SMS/app), passwordless, multi-tenancy (5 organizations), feature flags (10 max). No credit card required

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WorkOS Free stable

User Management is free for up to 1 million users. Single Sign-On starts at $125/connection. Directory Sync starts at $125/connection. Audit Logs are free with paid options for log streaming and event retention. Radar is free for the first 1,000 checks.

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Stytch Free stable

Authentication and fraud prevention — 10,000 MAU, passwordless login, OAuth, MFA, session management, device fingerprinting, 5 SSO/SCIM connections, 1,000 M2M tokens, password breach detection

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Keycloak Free OSS

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 limitsThe 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.

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FusionAuth Community stable

Identity platform — "FusionAuth Community is free and unlimited": self-host it on your own infrastructure, with the core authentication features and community support (forums, Slack, GitHub).

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Logto Free stable

Open-source identity solution — Free tier is $0/month for up to 50,000 MAU and 50K tokens. Includes user authentication, machine-to-machine apps, account APIs, audit logs, and user management. Additional features like RBAC, MFA, and Organizations are paid add-ons.

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Ory Free stable

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

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Free Tier Comparison

What you actually get for free on each platform. Auth0's 25K MAU free tier is competitive, but the jump to paid is the steepest in the industry.

Platform Free MAU SSO MFA Self-Hosted Best For
Auth0 25K Paid Yes No Enterprise identity + rules engine
Clerk 50K Paid Yes No Pre-built UI components + React DX
WorkOS 1M Paid Yes No Enterprise SSO + SCIM at scale
Supabase Auth 50K No Yes Yes (OSS) Full BaaS — auth + database + storage
Firebase Auth 50K No Yes No Google ecosystem + mobile SDKs
Logto 50K Paid Yes Yes (OSS) Modern OIDC + open-source option
Stytch 10K 5 connections Yes No Passwordless + fraud prevention
FusionAuth Unlimited* Yes Yes Yes (Apache 2.0) Full-featured self-hosted — zero cost
Keycloak Unlimited* Yes Yes Yes (Apache 2.0) Enterprise IAM — Red Hat backed
Ory 25K (cloud) Yes Yes Yes (Apache 2.0) Modular identity — Kratos + Hydra
Kinde 10.5K SAML Yes No Auth + feature flags + billing

*FusionAuth and Keycloak are free self-hosted with no user limits. WorkOS leads managed platforms at 1M MAU free (AuthKit). Clerk and Logto both offer 50K MAU. Supabase and Firebase bundle auth into broader BaaS free tiers.

Quick Comparison

Tool Free Tier Details Stability
Supabase Free Postgres development platform: database, Auth, Storage, Realtime and Edge Functions. The Free plan is $0: unlimited API ... stable
Firebase Spark Spark plan, no payment method needed: Auth (50K MAU), Firestore (1 GiB stored, 50K reads/day, 20K writes/day, 20K delete... stable
Clerk Hobby Drop-in auth with 50K monthly retained users free, unlimited apps stable
Kinde Free 10,500 MAU, OAuth 2.0/OIDC/SAML, MFA (email/SMS/app), passwordless, multi-tenancy (5 organizations), feature flags (10 m... stable
WorkOS Free User Management is free for up to 1 million users. Single Sign-On starts at $125/connection. Directory Sync starts at $1... stable
Stytch Free Authentication and fraud prevention — 10,000 MAU, passwordless login, OAuth, MFA, session management, device fingerprint... stable
Keycloak Free OSS Free OSS (Apache 2.0). Red Hat-backed identity and access management. SSO, OIDC, SAML, LDAP, social login, MFA, fine-gra... —
FusionAuth Community Identity platform — "FusionAuth Community is free and unlimited": self-host it on your own infrastructure, with the core... stable
Logto Free Open-source identity solution — Free tier is $0/month for up to 50,000 MAU and 50K tokens. Includes user authentication,... stable
Ory Free Open-source identity infrastructure — The 'Developer' tier is free, includes 1 member, 0 production environments, 2 deve... stable

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