Auth. Built for Devs. By Devs.

Every app requires secure, user-friendly login and authentication. It’s not only a requirement from your PM and CISO, but your customers as well.

But what about you? FusionAuth gives you, the developer, everything you need to implement auth so you don't have to build it yourself.

migrate from auth0 to fusionauth
migrate from auth0 to fusionauth
Authentication is too painful to build it yourself.
Just use ours.

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Trusted by Thousands of Developers and Millions of End-Users

free community edition

Free and unlimited

Only FusionAuth has Community Edition, free software with no limits on number of users. Download and run it yourself, kick the tires, no strings attached. Free Edition Download


All the Auth

When your project requires MFA, SSO, Passwordless, biometric ID, or social media login, we got it. We do all the standards - like Oauth, SAML, OIDC, SCIM and JWTs. Don't reinvent this stuff.

fusionauth cloud hosting

We host Or you host

FusionAuth lets you download and run anywhere you want. On-premise or in your cloud, with Docker and K8s if you like. Or we can host it for you in AWS, with a dedicated managed service, no shared SaaS.


What Our Customers Are Saying

The implementation is so much more intuitive than Auth0. I can run it on my own infrastructure and out of the box it supports everything I need. And more!

Nathan Carlson

Great tool! And all the right features plus awesome support.

Chris Obdam
Betty Blocks

The FusionAuth team has been extremely helpful. They really give you the attention you need to solve any identity challenge.

Danny Davis
Wonder Giant

I am blown away by FusionAuth. You just saved us $800-$1,500 per month from Auth0 pricing. They're gonna hate you.

Mirza Fazlic

"FusionAuth is an amazing product. Tons of features and the support is the best in the industry."

Marc Pearson
IT Consultant

I achieved in a single day's work what took a week and a half with Gluu. FusionAuth is just that simple to use.

Mike Rees
Growth Partners

We almost purchased Auth0, but we found FusionAuth and we all thought it was too good to be true. It's not!

Scott Plunket

FusionAuth works great for small companies with small budgets. Community Edition has tons of features and Developer Edition is startup budget friendly.

Jordi Mèlich

It's a huge win for us that we can self-host FusionAuth. Not only do we have extremely low latency for API calls, but also no rate limits. We were previously with Auth0 and their APIs and UIs were rate limited. This often made them horrifically slow.

Dan Spiteri
Hero Balancer
modern guide to oauth fusionauth ebook

Modern Guide to OAuth

This guide covers OAuth 2.0 from a real-world perspective and covers modern use cases of the specifications. It's based on hundreds client implementations and our experience building FusionAuth, an OAuth server which has been downloaded over a million times.

FusionAuth, Built for Devs, by Devs.

FusionAuth delivers auth features the way developers expect them, putting developers in the driver's seat. Download and learn for yourself.