Auth.
Built for Devs, by Devs

Secure, powerful, and flexible auth that developers love.

No Credit Card Required
fusionauth customizable mobile login with 2factor and idp

Fully Integrated Authentication and Authorization

FusionAuth adds login, registration, SSO, MFA, and a bazillion other features to your app in days - not months.

Simplifying Complex Identity Needs

Save months of development cycles by using FusionAuth for all your auth needs.

Built with a security-first mindset - giving you the freedom to accelerate your products and never worry about the next compliance or security requirement.

Scalable and reliable infrastructure that supports one user logging in -- or thousands at once.

API-first and fully customizable so your developers will love us.

fusionauth simplifying complex identify needs
fusionauth b2b b2c use cases

B2B & B2C Use Cases

From securing patient data in healthcare to enhancing user experiences in gaming and streamlining retail operations, our versatile platform meets your unique challenges.

Any Language. Any Platform. Any Technology.

Integration with any tech stack in minutes using our APIs or SDKs.

Enterprise Benefits, Without The Enterprise Bullsh*t

1,000+

Logins/sec Supported

99.99%

Uptime SLA

24/7

Engineer-led Support

Deploy Anywhere, Our Cloud, Your Cloud or On-Premise

FusionAuth can be hosted anywhere providing flexibility for you to choose the deployment method that best suits your infrastructure requirements.

free download