Identity Without Constraints
FusionAuth secures access for humans, services, and dynamic apps — giving you full control over identity to deploy, integrate, and scale.
Identity, Your Way
FusionAuth secures access for humans, services, and dynamic apps — giving you full control over identity to deploy, integrate, and scale.
API-Driven by Design
Every identity capability is available via API and built to integrate into your product, pipelines, and workflows.
- GET
/api/user/{'{id}'} - POST
/api/login - PUT
/api/user/registration - DEL
/api/user/{'{id}'}/2fa
Auth for Humans, Systems, and AI
Authenticate users, services, and AI and control what they can access with fine-grained access decisions.
Predictable Pricing
Scale users, regions, and workloads with no surprises on growth penalties.
Deploy Anywhere
Run identity self-hosted, dedicated, on-prem, hobby, or in any cloud-native environment. Your business rules, your regulations matter.
https://localhost:9011
Don't Let Identity Become the Bottleneck
Most companies have multiple identity types and have security, convenience and control, good auth just provides security. FusionAuth is built for teams who won't compromise.
Ship faster
By removing identity from your product roadmap.
Scale confidently
Across users, regions, and to shrink workloads.
Increase revenue
Without re-architecting for security, compliance, and control.
Reduce risk
With isolated infrastructure-level isolation and full control over applications and data.
- No forced SaaS upgrades
- No unpredictable pricing
- No shared infrastructure lockup
- No identity decisions that lock you in later
Built for Teams Running Critical Systems
Designed for teams who need security, control, and flexibility without compromise.
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Complex User Models
Support multi-tenant, hierarchical, and federated identity structures out of the box.
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Enterprise-Grade Isolation
Full tenant isolation means your data stays separate and secure.
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Built to Evolve With Your Business
Add capabilities over time without rearchitecting your identity layer.
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Data Sovereignty and Compliance
Meet GDPR, HIPAA, SOC 2, and regional data residency requirements.
Download FusionAuth's Free Community Edition
Sign up for our Free Community Edition or test-drive FusionAuth today.
Download NowTrusted By Engineering Teams
Trusted by 20+ Million Developers
"The FusionAuth team has been extremely helpful. They really give you the attention you need to solve any identity challenge."
"We evaluated every major auth provider. FusionAuth was the only one that let us deploy in our own VPC with zero vendor lock-in. That was the deal-maker."
"The API is clean, the docs are great, and the community is active. It's everything we wanted in an auth platform without the SaaS tax."
See Why G2 Ranks Us as a Leader in CIAM
FusionAuth consistently earns top rankings from thousands of real developer reviews on G2 — the world's largest software review platform.
Read Our Reviews