For a B2B application, choose customer identity around how a customer company joins, enforces its login policy and removes a departing employee. A large free user allowance can be less decisive than the number of enterprise connections, the organization model or who operates the identity service. Auth0 suits a configurable organization-aware identity program; Clerk emphasizes application UI and retained-user economics; WorkOS separates general authentication from enterprise connections; Stytch starts with organization-level policies; FusionAuth makes deployment ownership a central choice.
These are services for authenticating your application’s customers. Choosing your own employees’ identity provider is a different purchase, covered in our workforce SSO comparison. The application must also enforce access to its own records and APIs; an API management platform does not replace that authorization design.
Compare the customer boundary before the free allowance
| Platform | Reason to shortlist | Boundary that changes the purchase |
|---|---|---|
| Auth0 | Organization-aware login, federation and extensibility | B2B versus B2C entitlement; organizations and enterprise connections |
| Clerk | Prebuilt application UI with organization management | Retained users, retained organizations and enhanced B2B features |
| WorkOS AuthKit | General authentication plus modular enterprise onboarding | SSO and Directory Sync are separately metered connections |
| Stytch | Organization-first policies and customer administration | Active members, SSO/SCIM connections and optional services |
| FusionAuth | Control of a dedicated identity deployment | Tenant design, feature license, hosting and operating responsibility |
Auth0
Auth0 Organizations represents business customers inside an Auth0 tenant, with organization membership, connections, branding and roles. This makes it relevant when several customer companies need different federated login arrangements while your product retains a common identity platform. Plan organization-aware tokens and administration alongside the login experience.
The current pricing page has separate B2B and B2C selectors. Its free offering lists five organizations and one enterprise connection; paid B2C cards explicitly warn that continuing enterprise connections, self-service SSO and SCIM requires the B2B offering. Consequently, a displayed consumer-plan price is an unsuitable budget for an enterprise SaaS rollout. Obtain the B2B configuration for the actual organization and connection count, plus required MFA and machine access.
Auth0 is a defensible shortlist when customization and an established organization model matter more than minimizing one billing meter. The counterexample is a simple product whose customer companies need identical login behavior: extensive identity customization can add work without improving that customer’s onboarding.
Clerk
Clerk’s Organizations documentation combines memberships, roles and organization-aware application components. Its appeal is the amount of customer-facing account UI a product team can adopt rather than assemble. Evaluate the organization switcher, invitation flow and authorization context together; a polished sign-in screen alone does not settle multi-company access.
Clerk pricing uses monthly retained users, not ordinary monthly active users: a user must return at least a day after signup to count. Free B2B scope lists 100 retained organizations per application and a 20-member organization limit. The enhanced B2B add-on removes that member limit and adds capabilities including enterprise connections linked to organizations and custom roles; it is listed at US$100 monthly or US$85 per month billed annually, in addition to the applicable plan and usage.
This can suit teams prioritizing ready application components, provided both user and organization growth fit the quote. Compare retained-user counts using Clerk’s definition, and include SSO, directory connections and the B2B add-on where needed. A customer with many employees can cross the member boundary while total user traffic still looks small.
WorkOS AuthKit
AuthKit provides authentication, organization-related workflows and application integration guides, while WorkOS also offers enterprise SSO as a separate integration for an existing authentication stack. That gives a buyer two different projects to scope: replace general authentication, or add enterprise access to what already works.
The pricing model includes the first million users for AuthKit, but enterprise SSO and Directory Sync each start at US$125 per connection per month for the first 15 connections, with later volume tiers. A customer’s SSO connection and its provisioning directory are different billable products. Annual Credits adds separately described support and uptime commitments; do not import those commitments into pay-as-you-go merely because the login product is the same.
WorkOS is particularly worth considering when enterprise onboarding is the obstacle and the existing user system does not otherwise need replacement. A small number of users spread across many enterprise customers can still create a substantial connection bill. Price customer configuration count alongside traffic, rather than treating the free AuthKit allowance as the whole service.
Stytch
Stytch B2B documents organization discovery, per-organization authentication settings, an embeddable administration portal and SCIM provisioning. The practical attraction is letting customer administrators manage their company’s access requirements inside your product. That is a more specific requirement than adding another social login button.
The current B2B offering includes 10,000 monthly active users and agents, unlimited organizations, five SSO or SCIM connections and 1,000 machine-to-machine tokens before applicable paid usage. Optional branding and fraud services, and enterprise support commitments, have separate commercial scope. Confirm how both SSO and SCIM consume the connection allowance for the customer’s intended setup; unlimited organizations does not mean unlimited identity-provider connections.
Stytch fits a product whose customers need different login policies and self-service administration from the beginning. The tradeoff is adopting its B2B identity model deliberately, including membership and discovery behavior. If most customers only need a shared email-login flow, those enterprise controls may not be the first reason to change an otherwise adequate identity system.
FusionAuth
FusionAuth offers self-hosting and vendor hosting. Its tenant documentation explains that an instance belongs to one FusionAuth customer, while that customer can create multiple internal tenants to separate users, applications and groups. Those are two different meanings of tenancy. A tenant-per-customer design can deliberately give the same person separate identities at different client companies.
Community is free to self-host with core features; premium functionality, support and hosted capacity depend on the selected package. SCIM appears in the Enterprise feature scope. Budget the required license and an appropriate hosting configuration, or the staff and infrastructure for self-operation. Free software licensing does not supply managed availability, upgrades or incident response.
Choose FusionAuth for a concrete need to control deployment or identity separation, with an engineering owner for the resulting design. It is a weaker default when the business wants to hand off infrastructure completely and has no reason to manage the identity runtime. Do not assume its tenant boundary behaves like another provider’s organization membership.
Ask for one customer onboarding quote
Describe the same customer portfolio to every vendor: company count, employees per company, enterprise identity providers, provisioning directories, authentication policies and support needs. Then separate the ordinary user bill from the bill for enterprise onboarding. Ten thousand users at a few customers and the same user count across hundreds of federated customers are commercially different deployments.
Use Auth0 when its organization-aware configuration and extensibility meet the requirement; Clerk when integrated UI and retained-usage terms fit; WorkOS when enterprise connections can be added modularly; Stytch when organization-level control is the organizing principle; FusionAuth when deployment ownership is necessary. The connection allowance is not the authorization boundary. Record access still needs enforcement in your application.
Prepared by Toolverly Editorial with AI-assisted research and drafting. Product and pricing sources checked October 23, 2026.
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