Authentication Solutions & Tools for Any App
Passwords or passwordless, single sign-on or multi-factor, FusionAuth lets you authenticate in every way, with standards based authentication using Oauth2, OIDC, or SAML v2.
At FusionAuth, Security, Privacy and Compliance is Our Priority
FusionAuth is enterprise-ready with world class security, privacy, and compliance. It's our highest priority.
Authentication, Anywhere & Anyhow
FusionAuth gives you quick and easy authentication for any type of application including web, mobile, desktop and console apps. Use FusionAuth's OpenID Connect or SAML v2 login workflows, or build your own login experience using our APIs. Our library of content is here to help you along the way.
Fully Customizable Auth System
We let you customize everything. EVERYTHING. Login screens, user language, registration screens, emails, unlimited user custom fields, messages — you name it. It’s your application, so make the login experience completely yours.
Registration And Sign-up Forms
Emails and SMS Messages
Login and Sign-In Forms
Advanced Authentication Methods
Simple and secure user authentication options, complete with everything you need.
Connect With Everything
FusionAuth connects with other sources of user data, including LDAP and custom APIs. Authenticate against them forever or transparently migrate your data from external user data stores to FusionAuth.
20M+
Downloads
1,000+
Logins/sec Supported
99.99%
Uptime SLA
24/7
Engineer-led Support
Complete Auth for Any App
FusionAuth is a complete solution with no sacrifices. We got this. Go build something awesome.
API Driven
Use our customizable login flows or build your own experience on top of our APIs.
Explore Docs Flexible Hosting
Host yourself or use our cloud. It's always your data.
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Never Switch Customer Auth Providers Again
Whether you are building your MVP or have hit hockey stick growth, FusionAuth is a complete auth solution with no sacrifices. We got this. Go build something awesome.