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Auth0 alternatives: 7 apps ranked by verified data

Facts checked Oct 25, 2026AppBreakup editorialHow we rank

Common reasons people leave Auth0: costs rise sharply once you need B2B or enterprise features, and cloud only for most customers; no self-hosted edition. We ranked 7 alternatives by how directly each one replaces Auth0, then by reviews, real visits and how recently each app's facts were checked against its own website. Clerk currently ranks first.

Quick comparison

#AppPricingOpen sourcePlatformsVerified factsScore
1ClClerkFree plan + paidNoWeb, iOS, Android4 of 466.5
2WorkOS logoWorkOSFree plan + paidNoWeb4 of 462.6
3Keycloak logoKeycloakOpen sourceYesSelf-hosted, Linux, macOS +14 of 459.6
4FusionAuth logoFusionAuthFree plan + paidNoWeb, Self-hosted, Linux +23 of 357.2
5Zitadel logoZitadelOpen sourceYesWeb, Self-hosted4 of 455.3
6Amazon Cognito logoAmazon CognitoFree plan + paidNoWeb, iOS, Android4 of 453.6
7Firebase logoFirebaseFree plan + paidNoWeb, iOS, Android4 of 446.0
  1. Cl

    1. ClerkTop pick

    Best for: React and Next.js developers who want polished sign-in screens working in minutes

    Free plan + paidWeb, iOS, Android

    66.5

    score / 100

    Why switch from Auth0

    Faster to drop into React and Next.js apps, with prebuilt UI components and a larger free tier.

    Pros

    • Prebuilt, customisable UI components save weeks of work
    • Excellent Next.js and React integration
    • Generous free tier per application

    Cons

    • Cloud only; user data cannot be self-hosted
    • Enterprise SSO connections are billed individually
    • Less flexible than code-first libraries for unusual flows
    Visit Clerk Compare with Auth0Details and reviews
    How this score is calculated
    Editorial fit ×0.3100
    Reviews ×0.363
    Clicks (90 days) ×0.150
    Freshness ×0.1585
    Votes ×0.150

    0 counted reviews, 0 up and 0 down votes. Full formula

    Is Clerk a good Auth0 alternative?

    Verified facts

    4 of 4 verified
    Free plan
    Up to 50,000 monthly retained users per app
    Checked Oct 25, 2026clerk.com(opens source in a new tab)
    Pro price
    $20/month billed annually
    Checked Oct 25, 2026clerk.com(opens source in a new tab)
    Extra SSO connection
    $75/month each
    Checked Oct 25, 2026clerk.com(opens source in a new tab)
    Compliance
    SOC 2 Type 2
    Checked Oct 25, 2026clerk.com(opens source in a new tab)
  2. WorkOS logo

    2. WorkOS

    Best for: B2B SaaS companies selling to enterprises that ask for SSO and SCIM

    Free plan + paidWeb

    62.6

    score / 100

    Why switch from Auth0

    Better fit for B2B SaaS that mainly needs enterprise SSO and SCIM, with a free first million users.

    Pros

    • First million monthly active users are free
    • Self-serve Admin Portal for customers' IT admins
    • Clean APIs and docs for SSO and directory sync

    Cons

    • Each enterprise SSO connection is billed monthly
    • Cloud only
    • Less suited to consumer apps with heavy fraud concerns
    Visit WorkOS Details and reviews
    How this score is calculated
    Editorial fit ×0.387
    Reviews ×0.363
    Clicks (90 days) ×0.150
    Freshness ×0.1585
    Votes ×0.150

    0 counted reviews, 0 up and 0 down votes. Full formula

    Is WorkOS a good Auth0 alternative?

    Verified facts

    4 of 4 verified
    Free plan
    First 1 million active users free
    Checked Oct 25, 2026workos.com(opens source in a new tab)
    SSO price
    $125 per connection/month (1–15)
    Checked Oct 25, 2026workos.com(opens source in a new tab)
    Above 1M users
    $2,500/month per additional million
    Checked Oct 25, 2026workos.com(opens source in a new tab)
    Admin portal
    Self-serve SSO setup for IT admins
    Checked Oct 25, 2026workos.com(opens source in a new tab)
  3. Keycloak logo

    3. Keycloak

    Best for: Organisations that want standards-based SSO on their own infrastructure at no licence cost

    Open sourceSelf-hostableSelf-hosted, Linux, macOS, Windows

    59.6

    score / 100

    Why switch from Auth0

    Free, self-hosted and standards-based, for teams that would rather run identity themselves.

    Pros

    • Free and open source under Apache 2.0
    • Supports OIDC, OAuth 2.0 and SAML with LDAP and AD federation
    • Mature, widely deployed and well understood

    Cons

    • You run, scale and upgrade it yourself
    • Admin concepts and theming have a steep learning curve
    • Login pages look dated without custom themes
    Visit Keycloak Details and reviews
    How this score is calculated
    Editorial fit ×0.377
    Reviews ×0.363
    Clicks (90 days) ×0.150
    Freshness ×0.1585
    Votes ×0.150

    0 counted reviews, 0 up and 0 down votes. Full formula

    Is Keycloak a good Auth0 alternative?

    Verified facts

    4 of 4 verified
    License
    Apache-2.0
    Checked Oct 25, 2026github.com(opens source in a new tab)
    Protocols
    OpenID Connect, OAuth 2.0, SAML
    Checked Oct 25, 2026keycloak.org(opens source in a new tab)
    Directory federation
    LDAP and Active Directory
    Checked Oct 25, 2026keycloak.org(opens source in a new tab)
    Deployment
    Container image for Docker, Podman, Kubernetes
    Checked Oct 25, 2026keycloak.org(opens source in a new tab)
  4. FusionAuth logo

    4. FusionAuth

    Best for: Teams that want a full-featured identity server they can self-host for free

    Free plan + paidSelf-hostableWeb, Self-hosted, Linux, macOS, Windows

    57.2

    score / 100

    Why switch from Auth0

    Similar feature set with a free self-hosted Community edition and no per-user cloud lock-in.

    Pros

    • Free self-hosted Community edition with unlimited users
    • Complete REST API and client libraries
    • Same product whether self-hosted or cloud

    Cons

    • Not open source; premium features need a paid licence
    • Managed hosting plans get expensive quickly
    • You run, upgrade and secure it yourself when self-hosting
    Visit FusionAuth Details and reviews
    How this score is calculated
    Editorial fit ×0.369
    Reviews ×0.363
    Clicks (90 days) ×0.150
    Freshness ×0.1585
    Votes ×0.150

    0 counted reviews, 0 up and 0 down votes. Full formula

    Is FusionAuth a good Auth0 alternative?

    Verified facts

    3 of 3 verified
    Free plan
    Community edition, unlimited users
    Checked Oct 25, 2026fusionauth.io(opens source in a new tab)
    Self-hosting
    Yes, free
    Checked Oct 25, 2026fusionauth.io(opens source in a new tab)
    Starting price
    Starter from $162/month, billed annually
    Checked Oct 25, 2026fusionauth.io(opens source in a new tab)
  5. Zitadel logo

    5. Zitadel

    Best for: B2B SaaS teams that want multi-tenant identity with the option to self-host

    Open sourceSelf-hostableWeb, Self-hosted

    55.3

    score / 100

    Why switch from Auth0

    Open-source alternative with cloud or self-hosting and multi-tenancy built in.

    Pros

    • Multi-tenancy and delegated admin built into the core
    • Choice of managed cloud or self-hosting the same code
    • Full audit trail from its event-sourced design

    Cons

    • AGPL licence may need legal review for some companies
    • Smaller community than Keycloak
    • Free cloud tier is limited in daily active users
    Visit Zitadel Details and reviews
    How this score is calculated
    Editorial fit ×0.363
    Reviews ×0.363
    Clicks (90 days) ×0.150
    Freshness ×0.1585
    Votes ×0.150

    0 counted reviews, 0 up and 0 down votes. Full formula

    Is Zitadel a good Auth0 alternative?

    Verified facts

    4 of 4 verified
    License
    AGPL-3.0
    Checked Oct 25, 2026github.com(opens source in a new tab)
    Free plan
    $0/month cloud tier
    Checked Oct 25, 2026zitadel.com(opens source in a new tab)
    Pro price
    $100/month
    Checked Oct 25, 2026zitadel.com(opens source in a new tab)
    Data location
    EU, US, Switzerland or Australia
    Checked Oct 25, 2026zitadel.com(opens source in a new tab)
  6. Amazon Cognito logo

    6. Amazon Cognito

    Best for: Teams building on AWS that want cheap, integrated user sign-in

    Free plan + paidWeb, iOS, Android

    53.6

    score / 100

    Why switch from Auth0

    Cheaper per user for teams already on AWS, at the cost of a rougher developer experience.

    Pros

    • Low per-user cost with a free tier
    • Tight integration with API Gateway, Lambda and Amplify
    • Identity pools issue temporary AWS credentials

    Cons

    • Developer experience and docs are often described as clunky
    • Password hashes cannot be exported, making migration hard
    • Limited customisation of hosted login pages
    Visit Amazon Cognito Compare with Auth0Details and reviews
    How this score is calculated
    Editorial fit ×0.357
    Reviews ×0.363
    Clicks (90 days) ×0.150
    Freshness ×0.1585
    Votes ×0.150

    0 counted reviews, 0 up and 0 down votes. Full formula

    Is Amazon Cognito a good Auth0 alternative?

    Verified facts

    4 of 4 verified
    Free tier
    10,000 MAU per month
    Checked Oct 25, 2026aws.amazon.com(opens source in a new tab)
    Pricing tiers
    Lite, Essentials and Plus
    Checked Oct 25, 2026aws.amazon.com(opens source in a new tab)
    Federated users
    $0.015 per MAU above 50 free
    Checked Oct 25, 2026aws.amazon.com(opens source in a new tab)
    Passkeys
    Yes, on Essentials and Plus
    Checked Oct 25, 2026aws.amazon.com(opens source in a new tab)
  7. Firebase logo

    7. Firebase

    Best for: Mobile and web teams who want realtime sync, auth and push messaging from one vendor

    Free plan + paidWeb, iOS, Android

    46.0

    score / 100

    Why switch from Auth0

    Simpler and cheaper for mobile and web apps already using Firebase services.

    Pros

    • Mature SDKs for Android, iOS, Flutter and web
    • Realtime sync and offline support built into the client libraries
    • Wide set of mobile services such as crash reporting and push messaging

    Cons

    • Ties your app closely to Google Cloud
    • NoSQL query limits often force data duplication
    • Pay-as-you-go bills can spike with heavy reads
    Visit Firebase Details and reviews
    How this score is calculated
    Editorial fit ×0.332
    Reviews ×0.363
    Clicks (90 days) ×0.150
    Freshness ×0.1585
    Votes ×0.150

    0 counted reviews, 0 up and 0 down votes. Full formula

    Is Firebase a good Auth0 alternative?

    Verified facts

    4 of 4 verified
    Free plan
    Spark plan (no-cost)
    Checked Oct 25, 2026firebase.google.com(opens source in a new tab)
    Paid plan
    Blaze, pay as you go
    Checked Oct 25, 2026firebase.google.com(opens source in a new tab)
    Database
    Firestore, a NoSQL document database
    Checked Oct 25, 2026firebase.google.com(opens source in a new tab)
    SQL option
    PostgreSQL via Firebase SQL Connect
    Checked Oct 25, 2026firebase.google.com(opens source in a new tab)

The best Auth0 alternative for…

The highest-ranked app in this list for each need.

Cl

Best Auth0 alternative for most people

Clerk

Faster to drop into React and Next.js apps, with prebuilt UI components and a larger free tier.

Keycloak logo

Best Auth0 alternative for a free option

Keycloak

Free, self-hosted and standards-based, for teams that would rather run identity themselves.

WorkOS logo

Best Auth0 alternative for a free plan you can upgrade

WorkOS

Better fit for B2B SaaS that mainly needs enterprise SSO and SCIM, with a free first million users.

Zitadel logo

Best Auth0 alternative for open source

Zitadel

Open-source alternative with cloud or self-hosting and multi-tenancy built in.

FusionAuth logo

Best Auth0 alternative for self-hosting

FusionAuth

Similar feature set with a free self-hosted Community edition and no per-user cloud lock-in.

Keycloak logo

Best Auth0 alternative for Mac

Keycloak

Free, self-hosted and standards-based, for teams that would rather run identity themselves.

Keycloak logo

Best Auth0 alternative for Windows

Keycloak

Free, self-hosted and standards-based, for teams that would rather run identity themselves.

Keycloak logo

Best Auth0 alternative for Linux

Keycloak

Free, self-hosted and standards-based, for teams that would rather run identity themselves.

Amazon Cognito logo

Best Auth0 alternative for iPhone and Android

Amazon Cognito

Cheaper per user for teams already on AWS, at the cost of a rougher developer experience.

Firebase logo

Best Auth0 alternative for working in the browser

Firebase

Simpler and cheaper for mobile and web apps already using Firebase services.

Auth0 alternatives: common questions

What is the best alternative to Auth0?

Clerk ranks first right now. Faster to drop into React and Next.js apps, with prebuilt UI components and a larger free tier. WorkOS and Keycloak follow it in our ranking.

Is there a free alternative to Auth0?

Yes. Clerk (free plan + paid), WorkOS (free plan + paid), Keycloak (open source) and FusionAuth (free plan + paid) have a free option. Check each app's verified facts for current plan limits.

Is there an open-source alternative to Auth0?

Yes: Keycloak and Zitadel. Keycloak and Zitadel can also be self-hosted.

Which Auth0 alternatives work on Linux?

Keycloak and FusionAuth run on Linux.

Why do people switch from Auth0?

The complaints we hear most: costs rise sharply once you need B2B or enterprise features; cloud only for most customers; no self-hosted edition; dashboard and docs can be confusing alongside Okta's own products.

How is this list ranked?

Every app is scored with the same published formula: how directly it replaces Auth0, reviews (weighted by verification), visits from AppBreakup, how recently its facts were checked against its own website, and reader votes.