FusionAuth

Complete Customer Identity and Access Management (CIAM) platform with SSO, MFA, OAuth2, and OpenID Connect. Deploy anywhere with security-first design.

FusionAuth delivers a comprehensive authentication and user management platform designed for modern applications. Unlike traditional auth providers, it offers hybrid, single-tenant deployment that you can develop and test anywhere - whether on your own infrastructure, their cloud, or on-premise.

Key features include:

Single Sign-On (SSO) and Multi-Factor Authentication (MFA)
OAuth2 and OpenID Connect integrations
API-first architecture for seamless developer experience
Unlimited identity providers with no additional costs
Security-first design with 99.99% uptime SLA

The platform handles 1,000+ logins per second and provides 24/7 engineer-led support. With step-by-step integration guides and SDKs for any language or platform, developers can add complete authentication functionality in days rather than months.

Trusted by 20+ million developers, FusionAuth eliminates the complexity and escalating costs associated with other CIAM providers. Whether you're building an MVP or scaling to enterprise levels, the platform grows with your needs without vendor lock-in or usage-based pricing surprises.

Perfect for B2B and B2C use cases across healthcare, gaming, retail, and other industries requiring robust identity management solutions.

Features:

Passwordless Authentication

SSO Enterprise Connections

Client Credentials Support

Brute Force Protection

Suspicious IP Detection

Impossible Travel Protection

Bot Detection

Breached Password Protection

New Device Detection

MFA

Adaptive MFA

Security Monitoring Dashboard

FusionAuth exposes metrics, logs and events via API but requires external tools like Prometheus and Grafana

User Import

Provides user import methods including the User API, SCIM and connectors

Organizations

Tenants create isolated namespaces with separate login screens, password policies and email settings. API keys can be scoped to tenants for isolation and security

Per‑tenant rate limits can be configured for failed login, passwordless login, forgot password, email verification and two‑factor code sending. Exceeding the limit temporarily locks the account

Log Streaming

Environments

Tenants can be used to separate development, staging and production environments within a single FusionAuth instance. API keys scoped to tenants isolate data and configuration

Compliance: