Keycloak vs Frontegg: CIAM for B2B SaaS Compared

Last updated: June 2026

Frontegg is a commercial, managed CIAM and user-management platform built specifically for B2B SaaS products. It ships prebuilt self-service admin portals, org and team management, entitlements, and embeddable UI widgets so your customers can manage their own users without you writing a line of admin UI. Keycloak is an open-source, self-hostable IdP that provides a complete auth foundation — OIDC, SAML, MFA, federation, fine-grained RBAC — but leaves the SaaS-facing admin-portal experience to you or to extensions. The right choice comes down to build-vs-buy on the tenant admin experience: choose Frontegg for a turnkey B2B UX with no infrastructure to run; choose Keycloak for open source, protocol depth, and no per-MAU pricing — and add a managed Keycloak service like Skycloak to handle the ops layer.

What each platform is designed for

Frontegg’s thesis is that B2B SaaS companies waste too much engineering time rebuilding the same tenant admin portal. User invitation flows, role-assignment screens, audit logs surfaced to customers, self-service SSO configuration — every SaaS product needs these, and most build them from scratch. Frontegg packages all of it into hosted, embeddable components backed by a managed CIAM infrastructure.

Keycloak is an open-source identity provider maintained by Red Hat. It is built around standards — OpenID Connect, SAML 2.0, OAuth 2.0 — and designed to be the authoritative identity source across many applications. Keycloak 26.x improved the Organizations feature substantially, enabling genuine multi-tenancy within a single realm. You can read a full overview in our complete guide to Keycloak.

Both platforms handle login, SSO, MFA, and user management — but from opposite directions. Understanding that design intent is the most important part of this comparison.

Licensing and hosting model

Dimension	Keycloak	Frontegg
License	Apache 2.0 (open source)	Proprietary SaaS
Source available	Yes, fully	No
Self-host option	Yes (primary deployment model)	No
Managed option	Via third parties (e.g., Skycloak)	Yes (cloud-only)
Data residency control	Full — you choose the region and cloud	Frontegg’s cloud infrastructure
Vendor lock-in risk	Low — standard protocols throughout	Higher — proprietary admin portal APIs
Version upgrade control	You choose the cadence	Frontegg manages it

Keycloak’s Apache 2.0 license means you can inspect the source, fork it, and run it anywhere. There are no licensing fees regardless of how many users authenticate. Frontegg is a closed SaaS product: you access it through their APIs and hosted portals, and your user data lives in Frontegg’s cloud.

For teams subject to strict data residency requirements — healthcare, financial services, government — this distinction matters more than any feature checklist. With Keycloak self-hosted or on Skycloak’s managed platform, you choose the cloud region and control the database directly.

B2B org and team management

This is where the comparison becomes most interesting, and where Frontegg has historically held the clearest advantage.

Capability	Keycloak 26.x	Frontegg
Multi-tenancy model	Organizations feature (realm-level)	Built-in tenant model
Tenant isolation	Organization-level attribute and role separation	Full tenant isolation with subdomain support
Team/member management	Managed via Keycloak Admin API or Organizations UI	Prebuilt self-service admin portal
Role assignment per org	Yes, via organization roles	Yes, with UI for end customers
Invitation flows	Available, requires configuration	Prebuilt, embeddable
Entitlements / feature flags	Not built-in; requires custom implementation	Built-in entitlements engine
Audit log surfaced to tenants	Not out-of-the-box; requires custom work	Prebuilt, embeddable
Customer SSO configuration	Admin-managed in Keycloak console	Self-service SSO setup per tenant

Keycloak’s Organizations feature was substantially rewritten in version 26. Each organization gets its own roles, members, identity providers, and attribute namespace, with organization-scoped roles available in tokens.

What Keycloak does not include is a tenant-facing UI for managing any of this. If you want an enterprise customer’s IT admin to configure SSO, invite members, or assign roles through your product, you must build that interface against the Keycloak Admin API. Frontegg ships it as a drop-in React component — a real engineering time difference.

Self-service admin portal and embeddable UI

Feature	Keycloak	Frontegg
Embeddable admin portal	No — must build against Admin API	Yes — React component, fully white-labeled
End-user account self-service	Keycloak Account Console (customizable)	Embeddable profile and settings UI
Customer SSO self-setup	Not self-service	Yes — customer configures their own IdP
User invitation management	API-driven; UI must be built	Prebuilt invitation flows
Role management UI for tenants	Must build	Prebuilt
Custom branding per tenant	Via Keycloak themes or Organizations	Per-tenant branding built-in

This is Frontegg’s strongest differentiator. A B2B SaaS company using Frontegg can drop an <AdminPortal /> React component into their app and give enterprise customers a fully functional user management dashboard — invite users, assign roles, configure SSO, view audit logs — without filing a support ticket.

Replicating this in Keycloak requires building a custom admin frontend against the Admin REST API. Keycloak’s Admin API is comprehensive, but translating it into a polished tenant UI is non-trivial engineering work. The trade-off is control: a Frontegg hosted component bounds your customization to what Frontegg exposes; a Keycloak-backed admin UI gives you the full stack.

Protocol and standards support

Protocol / Standard	Keycloak	Frontegg
OpenID Connect	Full implementation	Yes
SAML 2.0 (IdP)	Yes	Yes
SAML 2.0 (SP)	Yes	Yes
OAuth 2.0	Full, including device flow, token exchange	Yes
LDAP / Active Directory federation	Yes, native	Yes
SCIM 2.0	Via extension (Skycloak includes it)	Yes, built-in
Passkeys / WebAuthn	Yes	Yes
TOTP / HOTP	Yes	Yes
Magic links	Via custom authenticator or extension	Yes
Social login providers	Any OIDC/SAML IdP; built-in connectors for major providers	Pre-built connectors for major providers

Keycloak’s protocol coverage is broader and more configurable. It can act as both an identity provider and a service provider in complex federation chains — useful for brokering between SAML IdPs and downstream OIDC clients, or running token exchange flows. The SAML Decoder and JWT Token Analyzer can help debug tokens from either platform during integration. Frontegg covers the common cases well but is less suited to deep protocol customization.

Customization and extensibility

Area	Keycloak	Frontegg
Login page theming	Full HTML/CSS/FreeMarker templates	CSS customization of hosted pages
Custom authentication flows	Composable flows with SPI providers	Limited flow customization
Custom user attributes	Yes, realm-level and per-client	Yes
SPI extensibility	Yes — Java SPIs for auth, user storage, events, protocol mappers	No equivalent
Event listeners	Synchronous SPI + webhook	Webhooks
Custom claims / token mappers	Full protocol mapper framework	Custom claims via configuration
Custom user storage	User Storage SPI — federate any user store	Not available

Keycloak’s SPI system is its deepest customization differentiator. You can write a Java provider that replaces or augments almost any server-side behavior: custom authentication logic, external user storage, attribute transformations, event-driven side effects that run synchronously within a request. Frontegg’s customization surface is more limited by design — their goal is a consistent, deployable product, which means opinionated defaults and fewer extension points.

Cost model

Neither platform publishes a single comparable pricing page, but the cost structures are fundamentally different.

Model	Keycloak	Frontegg
Base cost	Free (open source)	Subscription fee (contact sales)
Per-MAU charges	None	Yes — pricing scales with monthly active users
Infrastructure cost	Depends on hosting (self-host or managed)	Included in subscription
Per-seat or per-tenant fees	None in Keycloak itself	May apply depending on plan
Enterprise feature gating	All features included; no tier restrictions	Some features gated to higher tiers
Predictability at scale	High — infrastructure costs grow slowly relative to users	Lower — MAU-based pricing grows with your user base

Keycloak has no per-MAU pricing. Whether you authenticate 1,000 or 1,000,000 users, the software license cost is zero. Frontegg’s model, like most SaaS CIAM products, is tied to monthly active users and tenants — acceptable at early scale but variable as the product grows.

A self-hosted vs managed authentication cost analysis is worth running with your actual MAU projections. The IAM ROI Calculator can help model the trade-offs. Managed Keycloak services like Skycloak use flat-rate infrastructure pricing with no per-MAU exposure.

Multi-tenancy architecture

How each platform models tenancy is critical for B2B SaaS. Our multi-tenant authentication architecture guide covers the patterns in depth. In brief, Keycloak offers two approaches:

• Multiple realms: One realm per tenant — full isolation, higher operational overhead.
• Organizations feature: Multiple tenants within a single realm, each with their own members, roles, and identity providers. Recommended for most B2B SaaS use cases.

Keycloak’s Organizations feature supports linking identity providers per organization, assigning organization-scoped roles in tokens, and managing member lifecycles through the Admin API.

Frontegg’s tenancy model is purpose-built for B2B SaaS: every account is a tenant by default, roles are scoped per tenant, and the admin portal is tenant-aware from day one — no architectural decision required.

Where each platform wins

Choose Frontegg if:

• Your core differentiator is product velocity and you want to ship a B2B SaaS with tenant admin portals in days, not weeks.
• You do not have the engineering bandwidth to build and maintain a custom admin UI against the Keycloak Admin API.
• You need customer-configurable SSO setup as a self-service flow — Frontegg makes this a drop-in feature; Keycloak requires building it.
• An entitlements and feature-flag engine co-located with your user management is valuable for your product.
• You are comfortable with cloud-only infrastructure and no self-hosting option.

Choose Keycloak if:

• Open source and full data ownership are requirements — for compliance, cost, or philosophy.
• You need deep protocol support: complex SAML federation, token exchange, custom authenticators via SPI.
• No per-MAU pricing is a hard requirement, especially if you are building for large enterprise accounts.
• Your compliance posture demands control over where user data lives and how it is processed.
• You plan to build a custom admin UI anyway, making Frontegg’s prebuilt portal less compelling.
• You need LDAP/AD federation or custom user storage backends.

When you choose Keycloak but do not want to manage the infrastructure yourself, a managed service like Skycloak handles the ops layer — cluster management, upgrades, backups, observability — while leaving you with full access to Keycloak’s feature set and your own data.

It is worth being direct about where Keycloak requires more investment: building a tenant admin portal against the Keycloak Admin API is real engineering work; self-service SSO onboarding for enterprise customers is not included out of the box; and self-hosting carries operational overhead that Frontegg eliminates by design. These are genuine trade-offs, not minor caveats.

Frequently asked questions

Is Keycloak a Frontegg alternative?

Yes, with important caveats. Keycloak covers the authentication and authorization layer that Frontegg provides — OIDC, SAML, MFA, multi-tenancy, RBAC — but does not include Frontegg’s prebuilt self-service admin portal or embeddable UI components. If you need a turnkey B2B admin portal without building one, Frontegg is a more complete out-of-the-box package. If you need open source, protocol depth, no per-MAU pricing, and are willing to build the admin UX, Keycloak is the stronger foundation.

Is Frontegg open source?

No. Frontegg is a proprietary, closed-source SaaS platform. There is no self-hosting option. Your user data lives in Frontegg’s cloud infrastructure, and the product is available only as a managed service. Keycloak, by contrast, is fully open source under the Apache 2.0 license and can be self-hosted anywhere.

Does Keycloak support B2B multi-tenancy?

Yes. Keycloak 26.x includes a production-ready Organizations feature that models multi-tenancy within a single realm. Each organization can have its own members, roles, and identity provider connections. Organization membership and roles are included in OIDC tokens, making it straightforward to enforce tenant-scoped access in your application. For a detailed walkthrough, see our guide on multi-tenancy in Keycloak using the Organizations feature.

Can Keycloak compete with Frontegg for B2B SaaS?

Yes. Keycloak provides the auth, multi-tenancy, SSO, and RBAC primitives B2B SaaS products need. The gap is the tenant admin portal and self-service flows: teams that build those on top of the Keycloak Admin API typically have a more flexible result than a prebuilt portal allows, but at a real engineering cost. Our comparison of Keycloak vs Clerk covers the same build-vs-buy decision from a different angle.

How does Keycloak handle customer SSO configuration?

In standard Keycloak, adding an identity provider to an organization is an admin-side operation done via the Admin Console or REST API — your team handles SSO onboarding. Frontegg lets the customer’s IT admin configure SSO self-service, without involving your support team. Replicating that in Keycloak requires a custom onboarding UI backed by Admin API calls — achievable, but not out-of-the-box.

Wrapping up

Frontegg and Keycloak address adjacent but distinct problems. Frontegg is a B2B SaaS accelerator: it compresses the time from zero to a working tenant admin portal, customer SSO, and entitlements engine. That is its core value, and it delivers it well.

Keycloak is an identity foundation: open source, protocol-complete, deeply extensible, and free of per-MAU economics. The organizational flexibility, SPI extensibility, and standards depth are unmatched in open source. The investment is in building and maintaining the layers above the identity foundation — the admin UX, the self-service flows, the entitlements logic — that Frontegg bundles.

For teams where open source, data ownership, and cost predictability at scale are priorities, managed Keycloak is the right call. Skycloak’s managed Keycloak gives you the full Keycloak feature set without running the infrastructure yourself — no per-MAU fees, no operational overhead, and complete access to your user data.