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About FusionAuth
What is FusionAuth?
FusionAuth is a customer identity and access management (CIAM) platform that secures access for humans, services, and AI across any environment. It is API-driven by design, meaning every identity capability is available via API, making it easy to integrate into your product, pipelines, and workflows. FusionAuth supports complex user models for B2C, B2B, B2B2C, partners, APIs, and machine-to-machine identity.
What problem does it solve?
Many CIAM platforms force trade-offs between speed and security, convenience and control, or growth and cost predictability. FusionAuth is built for teams who don't want to compromise. It removes identity from your product roadmap, allowing you to ship faster, scale confidently across users and AI-driven workloads, increase revenue without re-architecting for security or compliance, and reduce risk with isolated infrastructure and full control over upgrades and data.
Who is it for?
FusionAuth is built for engineering teams running critical systems that need a flexible, self-hosted or dedicated identity solution. It is ideal for organizations that require data sovereignty, compliance, or isolated infrastructure—such as those in regulated industries. It is not for small projects that need a quick hosted solution without deployment overhead; for those, a fully managed SaaS like Auth0 might be simpler.
Real-world use cases
FusionAuth is used by developers to add authentication and user management to web and mobile apps, for single sign-on (SSO) across multiple applications, for API and machine-to-machine authentication, and for fine-grained authorization. It is trusted by engineering teams at companies like WeRoad and Com Laude, who switched from Auth0 due to scalability and pricing concerns.
Key features
- API-Driven Design — Every identity capability is available via API, making integration into your existing workflows straightforward.
- Complex User Models — Supports B2C, B2B, B2B2C, partners, APIs, and machine-to-machine identity with ease.
- Enterprise-Grade Isolation — Dedicated deployments ensure predictable performance and controlled upgrades, reducing shared infrastructure risk.
- Data Sovereignty & Compliance — Deploy in any geography to meet regulatory, privacy, and governance requirements.
- Flexible Deployment — Self-hosted, dedicated, on-prem, hybrid, or air-gapped—choose wherever your business demands.
- Fine-Grained Authorization — Control what users, services, and AI can access with detailed permissions.
SaaSpartout Score
7.3
/10
Editorial score from our review methodology — not user ratings.
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FusionAuth Pricing
FusionAuth pricing: from $162/mo.
For comparison: the median starting price in Cybersecurity is $9.99/month, measured across 116 tools we track. See the full SaaS Pricing Index →
Community
Free and unlimited. Self-host on your own infrastructure. Includes core authentication standards and features most apps need, plus community support (forums, Slack, GitHub).
Starter
Starting at $162/mo (billed annually). Adds premium features including advanced MFA, breached password detection, machine-to-machine authentication, and application theming. Includes basic hosting and community support.
Essentials
Starting at $2,970/mo (billed annually). Includes advanced connectivity, MFA, and security features, custom OAuth scopes, email support with 24-48 hour response time, and business hosting.
Enterprise
Starting at $2,970/mo (billed annually). Includes everything in Essentials plus advanced threat detection, SSO Tenant Manager, 24/7 support (email and phone), private Slack channel, solution architect guidance, and high availability hosting.
Free Community Edition is available for download. No free trial for paid plans is mentioned.
Frequently asked questions
Is FusionAuth free?
Yes, FusionAuth offers a free Community Edition that is self-hosted and unlimited for core authentication features. It includes community support via forums, Slack, and GitHub.
How much does FusionAuth cost?
FusionAuth's paid plans start at $162/month billed annually for the Starter plan. Essentials and Enterprise plans start at $2,970/month billed annually. There is also a free Community Edition.
What is FusionAuth used for?
FusionAuth is used for authentication and user management, including single sign-on (SSO), API and machine-to-machine authentication, and fine-grained authorization. It supports B2C, B2B, and B2B2C scenarios.
Who is FusionAuth best for?
FusionAuth is best for engineering teams running critical systems that need flexible, self-hosted or dedicated identity infrastructure, especially those with data sovereignty or compliance requirements. It is not ideal for small projects needing a quick hosted solution.
What are the top alternatives to FusionAuth?
Common alternatives include Auth0, Okta, and Keycloak. FusionAuth differentiates itself with predictable pricing and no per-identity-provider fees, which can be a major advantage over some competitors.
What is a key limitation of FusionAuth?
One limitation is that the free Community Edition requires self-hosting, so you must manage your own infrastructure. Also, more advanced features like threat detection and 24/7 support are only available in higher-tier paid plans.
