FusionAuth
Last verified 2026-04-23 · Reviewed by guptadeepak
Editorial verdict
FusionAuth is the right answer when you want self-hosted CIAM without taking on Keycloak's operational weight, and want the option to switch to managed without changing vendors. Single-binary deploy, modern docs, and a genuinely usable Community tier make it the practical default for self-host evaluations in 2026, particularly for B2C and mid-market B2B SaaS that don't need FedRAMP or Zanzibar-style FGA.
Last verified by @guptadeepak on 2026-04-23.
At a glance
- Best for
- Teams that want self-hosted CIAM with lighter ops than Keycloak
- Pricing
- tiered-mau
- Free tier
- Unlimited
- Deployment
- self-hosted, cloud-saas, on-prem, hybrid
- SOC 2 Type II
- Yes
- Passkeys
- Native
- Self-host
- Yes
- Open source
- No
Funding & business
- Funding model
- Venture-backed
- Total raised
- $65M
- Latest round
- Growth · $65M · 2023
- Years in business
- 8 yrs
- Round led by
- Updata Partners
- Profitable
- Yes
Investors
Bootstrapped and profitable for its first five years; took a single $65M growth round from Updata in late 2023.
Funding data from primary source. See also the CIAM investor landscape.
Strengths
- Single-binary self-host that runs on a laptop in 5 minutes, operational profile dramatically lighter than Keycloak.
- Genuine free Community edition under custom Open Source-style license, with paid tiers adding features rather than gating core auth.
- Excellent docs and developer experience by self-hosted CIAM standards, closer to Auth0 / Stytch DX than Keycloak's.
- Both self-hosted and managed (FusionAuth Cloud) options from one product, same code, same APIs.
Limitations
- License is Apache-2.0-style for Community but not OSI-certified open source, some procurement teams flag this.
- No native FGA / Zanzibar-style fine-grained authorization.
- Compliance footprint for the managed Cloud is narrower than enterprise SaaS, no FedRAMP, no ISO 27001.
- Smaller community than Keycloak; partner ecosystem is younger.
Capability matrix
Every vendor scored on the same axes. See the methodology for criteria.
| Password authentication | Yes |
|---|---|
| Social login | Yes |
| Magic links | Yes |
| SMS OTP | Yes |
| Email OTP | Yes |
| TOTP (authenticator app) | Yes |
| Push MFA | No |
| WebAuthn / passkeys | Yes |
| Biometric | Yes |
| Hardware security keys | Yes |
| SAML SSO | Yes |
| OIDC SSO | Yes |
| OAuth 2.0 SSO | Yes |
| Enterprise federation | Yes |
| Passwordless-only flows | Yes |
| Adaptive MFA | Partial |
| Step-up auth | Yes |
| RBAC | Yes |
|---|---|
| ABAC | Partial |
| ReBAC | No |
| FGA engine | No |
| API authorization | Yes |
| Fine-grained permissions | Yes |
| Self-service registration | Yes |
|---|---|
| Progressive profiling | Yes |
| Self-service account | Yes |
| Bulk user import | Yes |
| Admin user search | Yes |
| Custom user metadata | Yes |
| Organizations / tenants | Yes |
| Multi-tenancy | Yes |
| REST API | Yes |
|---|---|
| GraphQL API | No |
| SDKs | js, node, react, ios, swift, android, kotlin, java, python, go, php, ruby, dotnet, dart |
| CLI | Yes |
| Terraform provider | Yes |
| Local emulator | Yes |
| Extension model | Lambda functions (JavaScript, in-product) + webhooks |
| Bot detection | Partial |
|---|---|
| Breached password detection | Yes |
| Brute-force protection | Yes |
| Anomaly detection | Partial |
| Log streams | Yes |
| Audit logs | Yes |
| GDPR data export | Yes |
| PII minimization | Partial |
| Post-quantum roadmap | No |
| MCP support | No |
|---|---|
| OAuth 2.1 | Yes |
| Dynamic client registration | Yes |
| Agent vs human token separation | No |
| Web Bot Auth | No |
| SOC 2 Type II | Yes |
|---|---|
| ISO 27001 | No |
| ISO 27018 | No |
| HIPAA | Yes |
| PCI DSS | No |
| GDPR | Yes |
| CCPA | Yes |
| FedRAMP | No |
| EU data residency | Yes |
| Consent management | Partial |
|---|---|
| Preference center | Partial |
| Purpose-specific consent | Partial |
| Integrates with CMPs | n/a |
Pricing
| 10,000 MAU | $100/mo |
|---|---|
| 100,000 MAU | $400/mo |
| 500,000 MAU | $1,500/mo |
| 1,000,000 MAU | $3,000/mo |
- Self-hosted Community edition is free, covers most core features
- Self-hosted Starter / Essentials / Enterprise tiers add features (advanced threat detection, SLA support, themes)
- FusionAuth Cloud (managed) priced per-MAU like a SaaS CIAM
- Self-host operating cost (DB, infrastructure, engineering), typically lighter than Keycloak
Estimates use the standard assumptions in our methodology. Always confirm with the vendor.
Best for
- Teams that want self-hosted CIAM with lighter ops than Keycloak
- Apps that need to switch between self-hosted and managed without changing vendors
- B2B SaaS in regulated industries needing data control without enterprise-CIAM pricing
Not for
- Workloads requiring FedRAMP or strict ISO 27001 attestations on the managed product
- Authorization-heavy use cases requiring Zanzibar-style FGA
- Procurement environments that require strictly OSI-certified licenses
FAQ
- Is FusionAuth open source?
- FusionAuth Community edition is freely available under a custom Apache-2.0-style license with some commercial-use clauses, but it is not OSI-certified. For most teams this is functionally equivalent to OSS; for procurement requiring strict OSI compliance, Keycloak or Ory are alternatives.
- How does FusionAuth compare to Keycloak?
- FusionAuth is materially lighter operationally, single binary instead of a Java/JBoss-style stack, modern docs, faster onboarding. Keycloak has a larger community, broader theme/SPI ecosystem, and stricter open-source licensing. For teams choosing self-hosted CIAM in 2026, FusionAuth is the lighter-ops answer; Keycloak is the larger-ecosystem answer.
- Can I run FusionAuth self-hosted and switch to Cloud later?
- Yes, same product, same APIs, same admin UI. User export / import is straightforward. This is unique among the vendors in this index; everyone else forces a one-way commitment to self-hosted or managed.
Sources
- FusionAuth Pricingaccessed 2026-04-22
- FusionAuth Documentationaccessed 2026-04-22
- FusionAuth Licenseaccessed 2026-04-22
What FusionAuth is
FusionAuth launched in 2018 with a focused product: ship a CIAM platform that self-hosts in five minutes from a single binary, with a genuinely free Community tier and the option to upgrade to managed Cloud or paid self-hosted editions. The product is mature: full OAuth 2.0 / OIDC / SAML, MFA, passkeys, B2B Tenants, advanced theming, webhook delivery, and Lambda functions written in JavaScript that run inside the auth server. The buyer is typically a team that has weighed Keycloak's operational tax against SaaS CIAM costs and wants a third option.
Where FusionAuth wins
The single-binary deploy is the headline. A team with no prior auth-infrastructure experience can have FusionAuth running locally with Docker Compose in under ten minutes, which is closer to a SaaS onboarding experience than to Keycloak's. Production deployments need the standard stateful-service operational discipline (HA, backups, schema migrations) but the operational profile is materially lighter.
The Community tier is genuinely usable, not a feature-gated trial. Core auth, MFA, passkeys, OAuth/OIDC, basic tenants, and most admin features are available without paying. Paid tiers add advanced features (threat detection, advanced theming, SLA support) rather than withholding the core.
The same product runs as self-hosted and as managed FusionAuth Cloud. APIs are identical; user export / import works between deployments. This is unique in the index, everyone else forces a one-way bet on self-hosted or managed.
DX is well above the open-source-CIAM median. Docs are modern and well-organized; SDK coverage spans the major languages; the admin console is functional and reasonably current.
Where FusionAuth hurts
The license is the lasting friction. The Community edition uses a custom Apache-2.0-style license with some commercial-use clauses, close enough to OSS for most teams but not OSI-certified. Procurement teams that require strict open-source compliance (notably some public-sector buyers) flag this; for those buyers, Keycloak or Ory are cleaner.
There's no native Zanzibar-style FGA. Authorization stays at RBAC plus rule-based ABAC; for fine-grained per-resource permissions at scale, pair with OpenFGA / Authzed / Permify.
Compliance for the managed Cloud is narrower than enterprise SaaS, SOC 2 Type II yes, ISO 27001 no, FedRAMP no. For federal workloads or strict enterprise audit checklists, FusionAuth Cloud falls short of Auth0, Cognito, or Entra External ID.
The community is large but smaller than Keycloak's. Stack Overflow coverage is good but thinner than Keycloak's at production-edge cases.
How FusionAuth compares
The closest comparisons are Keycloak vs FusionAuth for the self-host call and Auth0 vs FusionAuth for the SaaS-vs-self-host call. For modern OSS architecture, Ory and Zitadel are alternatives. For lighter B2C-only OSS, Hanko and SuperTokens are the modern picks.
Editorial changelog (1 entry)
Editorial review: capability matrix and TCO bands confirmed against the latest vendor documentation.