Auth0 alternatives are other authentication platforms for adding sign-up, login, social sign-in, multi-factor authentication and single sign-on to your app. Managed services get you live fastest, while open-source servers give you full control of user data. Plan for passkeys from the start, because passwordless login is where authentication is heading.
Every app needs a front door, and building login yourself is one of the easiest ways to create a security problem. Authentication platforms handle passwords, social logins, MFA and sessions so you don't have to.
Here are ten Auth0 alternatives in no particular order, sorted alphabetically, from developer-first managed services to open-source identity servers. Each description comes from the vendor's own website, re-checked today. If you want your users to pick stronger passwords in the meantime, my free password generator is a handy link to share.
Start with your users. A consumer app needs smooth sign-up and social login, while a business app often needs single sign-on with each customer's identity provider.
And think about where user data must live. Some businesses need it in a particular region or on their own servers, which narrows the choice quickly. It's much easier to decide this before launch than to move every account later.
Auth0 alternatives at a glance
In the free plan column, Yes means the tool's own site describes a free version or free plan, Trial only means a time-limited trial, and No means neither is stated. Free versions often come with limits, so check what's included before you rely on one.
| Tool | Type | Good for | Free plan |
|---|---|---|---|
| Clerk | Authentication and user management | Drop-in login for web apps | Yes |
| Descope | Authentication platform | Visual login flows with no code | Yes |
| Firebase Authentication | Auth service from Google | Mobile and web apps on Firebase | Yes |
| Frontegg | User management platform | B2B apps with admin portals | Yes |
| FusionAuth | Customer identity platform | Self-hosted or managed auth | Yes |
| Keycloak | Open-source identity server | Full control with open source | Yes |
| Ory | Open-source identity infrastructure | Building blocks for identity | Yes |
| Stytch | Authentication platform | Passwordless and fraud protection | Yes |
| SuperTokens | Open-source authentication | Self-hosted login without limits | Yes |
| WorkOS | Enterprise auth platform | Selling to enterprise customers | Yes |
Ten Auth0 alternatives to consider
Clerk
Best for: Developers who want pre-built sign-in components and user management for modern web apps.
Descope
Best for: Teams who want to design login and sign-up flows visually, with passwordless options.
Firebase Authentication
Best for: App developers already using Firebase who want simple sign-in for mobile and web.
Frontegg
Best for: B2B software companies who want login plus self-service admin portals for customers.
FusionAuth
Best for: Developers who want a full identity platform they can host themselves or have managed.
Keycloak
Best for: Teams who want a free, open-source identity and access server they run themselves.
Ory
Best for: Engineering teams who want open-source identity components and a managed network option.
Stytch
Best for: Developers who want passwordless login options and fraud protection for consumer or B2B apps.
SuperTokens
Best for: Developers who want open-source authentication they can self-host for free.
WorkOS
Best for: B2B startups who want single sign-on and directory sync for enterprise customers.
Why passkeys should be on your list from day one
Here's the direction of travel worth planning for. The FIDO Alliance explains that passkeys use cryptographic keys on users' own devices, such as computers, phones or security keys, and that they can be securely synced across a user's devices or bound to one particular device. There's no password to steal or phish.
Most modern authentication platforms now support passkeys, but how easy they make it varies a lot. Ask to see the passkey sign-up flow before you choose, not just the password one.
What to check in an Auth0 alternative
- Login methods: passwords, passkeys, magic links and social login?
- MFA: which second factors are supported?
- Single sign-on: can business customers use their own identity provider?
- Data location: where is user data stored, and can you self-host?
- Migration: can you import existing users and password hashes?
How to migrate authentication safely
- Export your user list and check how passwords are stored.
- Set up the new provider in a test environment.
- Migrate users in small batches, or move them as they next log in.
- Keep the old system available as a fallback for a few weeks.
- Turn on MFA and passkeys once everyone has moved.
Authentication mistakes that cause breaches
- Building it yourself. Use a proven provider or server.
- No MFA. Passwords alone aren't enough.
- Weak reset flows. Attackers love sloppy password resets.
- No rate limits. Stop endless login guessing.
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Do you make authentication tools? Tool makers can ask to be considered for a featured place on this list.
My plain advice on Auth0 alternatives
Don't build login yourself. Even if you choose open source and host it yourself, use a proven identity server rather than writing password handling from scratch.
And test the whole user journey, including password resets and locked accounts. That's where users get stuck and support tickets pile up. Ask someone outside your team to sign up and reset a password while you watch, and fix every point where they hesitate.
Frequently asked questions
What can replace Auth0?
Managed authentication services and open-source identity servers can both replace it.
Is there a free Auth0 alternative?
Several have free tiers, and open-source options are free to self-host.
What's the difference between authentication and authorisation?
Authentication checks who someone is. Authorisation decides what they can do.
What are passkeys?
They're a passwordless way to sign in using cryptographic keys on your devices.
Can I self-host authentication?
Yes. Open-source identity servers can run on your own infrastructure.
What's single sign-on?
It lets people use one login, often their work account, across many apps.
Can I move users without making them reset passwords?
Often, if the new provider can import your password hashes.
Do I need MFA?
Yes for anything sensitive. It's one of the strongest protections against account takeover.
What's a magic link?
It's a login link sent by email instead of a password.
How long does an auth migration take?
It depends on users and features. Plan in phases, with a fallback.
Is social login safe?
It can be, and it saves users creating another password.
Do these work with mobile apps?
Most provide SDKs for iPhone and Android apps.
Can I use more than one login method?
Yes. Most platforms let users choose between passkeys, passwords, magic links and social login.
Who owns my user data?
Check the provider's terms. With self-hosted options, the data stays on your own servers.
