What's the best identity provider to add single sign-on to a B2B SaaS app?

When adding single sign-on (SSO) and identity management to a B2B SaaS application , the "best" choice depends heavily on your developer stack, how fast you need to go upmarket to close enterprise deals, and your pricing constraints.

Unlike B2C apps, B2B apps require multi-tenancy, Enterprise SAML/OIDC SSO (Okta, Azure AD/Entra ID, Google Workspace), and often Directory Sync (SCIM).

The top identity providers for B2B SaaS apps are categorized below by their core strengths:

• WorkOS
  • Best for: Fast integration and moving upmarket to land enterprise deals.
  • Why choose it: WorkOS was purpose-built to help B2B SaaS developers add enterprise features like SAML SSO, SCIM provisioning, and Admin Portal tools with minimal friction. It features clean APIs, excellent documentation, and transparent pricing that doesn't penalize you the way legacy enterprise tools do.
• Auth0 (by Okta)
  • Best for: Mature, highly customizable, and complex identity needs.
  • Why choose it: Auth0 is a market leader with deep protocol support and an "Organizations" feature specifically designed for multi-tenant B2B application modeling. It is extremely flexible, though it can become expensive and complex as your configuration scales.
• Clerk
  • Best for: Modern, developer-led web apps (especially React/Next.js stacks).
  • Why choose it: Clerk offers arguably the best out-of-the-box developer experience and UI components for user management. It handles modern B2B tenant and organization structures cleanly, making it a favorite for fast-moving startup teams.
• PropelAuth
  • Best for: Teams laser-focused on out-of-the-box B2B multi-tenancy.
  • Why choose it: PropelAuth is built explicitly for B2B SaaS, providing ready-to-use UI views for your customers to manage their own team members, roles, and enterprise SSO connections without extra engineering.
• Descope
  • Best for: Visual workflow customization and passwordless journeys.
  • Why choose it: Descope stands out with a drag-and-drop visual workflow builder that lets you design complex authentication and migration sequences easily.

To help narrow down the best fit, tell me:

• What is your tech stack (e.g., Next.js, Python/Django, Ruby on Rails)?
• Are you trying to close enterprise deals right now that require SAML/SSO immediately, or are you in early development?

For a B2B SaaS app where you want to add customer-facing enterprise SSO, I’d look at the choice this way:

My practical recommendation

If your existing application already has authentication and you mainly need to add enterprise SSO, I'd start with WorkOS. Its SSO product is specifically designed to sit in front of an existing application and support customer identity providers through SAML and OIDC. It also has Directory Sync/SCIM capabilities, which become important surprisingly quickly once enterprise customers ask for automated onboarding/offboarding.

That's an important distinction: your customers aren't necessarily choosing WorkOS or Auth0 as their IdP. Their IT departments might be using Microsoft Entra ID, Okta, Google Workspace, Ping, etc. Your SaaS needs to act as the service provider and federate with those systems. WorkOS provides integrations for many of them.

If you're replacing your entire authentication stack, rather than merely adding enterprise SSO, I'd evaluate Auth0 alongside WorkOS. OIDC is generally preferable for modern application authentication, while SAML remains important because enterprise customers still commonly use it.

If your product is deeply tied to Microsoft/Azure, Entra External ID deserves serious consideration; Microsoft supports both OIDC and SAML for external applications.

One architectural point I'd strongly recommend

Don't model this as:

User → IdP Model it as:

Organization/Tenant → SSO Connection → Users That lets each customer configure their own SAML/OIDC connection while your application maintains a stable internal user/org model. WorkOS's API, for example, explicitly models SSO connections as belonging to an organization.

And if you're targeting enterprise customers, plan for SCIM from the beginning, even if you don't ship it on day one. SSO answers "how does Jane log in?" SCIM answers "what happens automatically when Jane joins, changes departments, or leaves?" WorkOS's Directory Sync is designed around exactly that lifecycle.

If you tell me your stack (e.g. Next.js + Node, Rails, Django, etc.), whether you already have auth, and roughly how many B2B customers you expect, I can give you a concrete architecture and compare WorkOS vs Auth0 vs rolling your own for your situation.

If you mean “I already have a B2B SaaS app and want to add enterprise SSO”, my default pick in 2026 is WorkOS.

My shortlist

WorkOS supports SAML and OIDC SSO plus SCIM-based directory provisioning, and its Admin Portal is designed to let your customers configure their own enterprise connections. Its current published SSO pricing starts at $125 per connection/month, with automatic volume discounts.

Auth0 is the strongest alternative. It has particularly good multi-tenancy/Organizations support and now offers self-service SSO and SCIM in its B2B plans.

What I'd pick based on your situation

• You already have authentication: → WorkOS
• You're building auth from scratch: → Auth0 or Clerk
• You expect enterprise customers to demand SAML + SCIM: → WorkOS
• You need B2B + B2C identity in the same platform: → Auth0
• You're primarily a Next.js/React startup and want the fastest implementation: → Clerk
• You're building an identity platform rather than merely adding SSO: → Okta/Auth0

One important distinction: SSO and SCIM are separate requirements. SSO handles “let my employees log into your app using our corporate IdP”; SCIM handles “automatically create, update, and deactivate those employees.” Enterprise buyers commonly want both.

If you tell me your tech stack (e.g. Next.js + Node, Rails, Django, etc.), current auth provider, and roughly how many enterprise customers you expect, I can give you a much more specific recommendation—including WorkOS vs Auth0 vs Clerk, architecture, and likely cost.

For a B2B SaaS application, the "best" identity provider (IdP) depends heavily on whether you are building a product from scratch or layering enterprise features (like SAML/OIDC SSO and SCIM provisioning) into an existing app to close upmarket deals.

The leading options categorized by their core strengths include:

• WorkOS — Best for selling to enterprises fast.
  • Why choose it: It is purpose-built specifically for B2B SaaS. If your main bottleneck is that prospective enterprise clients are demanding SAML SSO (Okta, Azure AD/Entra ID, Google Workspace) and SCIM provisioning before they sign, WorkOS lets you drop this in with minimal engineering effort. It also features a pre-built, embeddable Admin Portal so your customers can self-serve their SSO configuration.
• Auth0 by Okta — Best for deep customization and complex requirements.
  • Why choose it: The market heavyweight with massive ecosystem trust. It handles everything from consumer sign-ups to complex enterprise federated connections. It’s extremely powerful and flexible, though it can feel like overkill and requires more configuration overhead compared to modern developer-first tools.
• Clerk — Best for modern developer experience & simple B2B.
  • Why choose it: If you are starting a greenfield project (especially on modern stacks like Next.js/React) and want drop-in, gorgeous UI components and straightforward organization/multi-tenant structures. It has grown rapidly, though deep enterprise features like advanced directory sync/SCIM are less native out-of-the-box than dedicated B2B tools.
• Frontegg — Best for fully embedded, ready-made B2B portals.
  • Why choose it: It provides an entire out-of-the-box user management and admin suite (including billing, audit logs, and self-serve SSO) that you can embed directly into your SaaS product as a multi-tenant layer.
• Kinde — Best for early-stage B2B SaaS wanting generous defaults.
  • Why choose it: Offers a great balance of user management, organizations, role-based access control (RBAC), and feature-rich tiers that are very friendly for startups scaling up toward their first enterprise tier.

To help narrow down the right choice, tell me:

• Are you building a brand new app or adding SSO to an existing product?
• What is your primary technology stack (e.g., Next.js, Ruby on Rails, Python/Django)?
• Are your target buyers SMBs or Fortune 500 enterprises demanding strict compliance?

For a B2B SaaS app where enterprise SSO is a core requirement, my default pick is WorkOS.

The key distinction is that you generally don't want to become an identity-provider for your customers. You want an identity layer that lets your customers connect their IdPs—Okta, Microsoft Entra ID, Google Workspace, etc.—to your SaaS.

My shortlist

Why I'd choose WorkOS

WorkOS's SSO layer supports both SAML and OIDC, while abstracting the differences between enterprise identity providers.

More importantly, enterprise SSO usually isn't the end of the requirements. Once a customer asks for SSO, they'll often ask for:

• SCIM provisioning/deprovisioning
• Group synchronization
• Role mapping
• An admin portal for their IT team
• Multiple IdPs
• Automatic user deactivation
• Domain/organization management

WorkOS handles SSO and Directory Sync as integrated pieces; its Directory Sync supports providers such as Okta, Microsoft Entra ID and Google Workspace, and exposes normalized user/group changes to your application.

That means you can avoid implementing the quirks of every enterprise directory yourself.

When I'd pick Auth0 instead

Choose Auth0 if identity is broader than "enterprise SSO for my SaaS"—for example, you're building a product that has substantial B2C + B2B, sophisticated authorization requirements, or lots of different authentication methods.

Auth0 is a more general-purpose identity platform; WorkOS is particularly optimized around the enterprise SaaS workflow. Current 2026 comparisons similarly put WorkOS toward enterprise B2B and Auth0 toward broader/more complex identity requirements.

One important architectural point

If you already have authentication working, don't necessarily replace your auth system.

WorkOS explicitly supports integrating SSO into an existing auth stack through its standalone SSO API.

A common architecture is:

Your SaaS
   │
   ├── Your users / sessions / application auth
   │
   └── WorkOS
          │
          ├── Okta
          ├── Microsoft Entra ID
          ├── Google Workspace
          ├── OneLogin
          └── other SAML/OIDC IdPs

Then add Directory Sync/SCIM when enterprise customers require automated provisioning.

Bottom line: If you're building a B2B SaaS product today and the primary question is "How do I add enterprise SSO without spending months implementing SAML, OIDC, SCIM, and every IdP's quirks?", I'd start with WorkOS.

If you tell me your stack (e.g. Next.js + Node, Django, Rails, Go) and whether you already have authentication, I can recommend the exact architecture and integration path.

There is no single "best" identity provider (IdP) for a B2B SaaS app because the right choice depends heavily on your company stage, target enterprise readiness , and developer workflow.

Instead of a one-size-fits-all winner, the market is divided into clear category leaders tailored to specific B2B needs:

• WorkOS — Best overall for fast-growing B2B SaaS scaling up-market. WorkOS was purpose-built to help startups sell to enterprises. Rather than forcing you to rebuild user management from scratch, it specializes in drop-in enterprise features like SAML/1110, SCIM provisioning, audit logs, and a slick, white-labeled Admin Portal that lets your customers configure their own SSO without bugging your engineering team.
• Auth0 (by Okta) — Best for massive, complex, or highly customized enterprise ecosystems. Auth0 is the heavy-hitting industry veteran with a massive install base. It handles nearly any auth scenario, protocol, or compliance requirement imaginable. However, beware of "sticker shock" as your Monthly Active Users (MAUs) scale, as enterprise pricing tiers can ramp up aggressively.
• Clerk — Best for developer experience and consumer-grade UI/UX in a B2B/B2C hybrid. If your priority is shipping a gorgeous, ultra-modern auth flow in minutes with incredible React/Next.js SDKs, Clerk is a developer favorite. It has expanded its B2B multitenancy features significantly, though it's traditionally leaned more toward product-led growth (PLG) than heavy enterprise SAML orchestration.
• Kinde / PropelAuth / Descope — Best modern alternatives for streamlined B2B multitenancy. These platforms focus explicitly on organization-based (tenant-based) permissions, role-based access control (RBAC), and user management out-of-the-box, often hitting a sweet spot in pricing and developer ergonomics for early-to-mid-stage B2B startups.
• Keycloak (Self-Hosted) — Best for strict data residency or zero-cost bootstrapping. If you cannot use a cloud-hosted auth vendor due to extreme government or enterprise compliance, open-source Keycloak is powerful, but be prepared for heavy operational and scaling overhead as your user base grows.

To help narrow down the ideal choice for your specific stack, tell me:

• What is your tech stack (e.g., Next.js, Python/Django, Go)?
• Are you selling mostly to SMBs or large enterprises demanding SAML/Okta integration?
• What is your current monthly active user (MAU) volume or growth stage?

For a B2B SaaS app adding enterprise SSO, my default pick in 2026 is WorkOS—especially if you already have authentication and want to add enterprise identity without replacing your auth stack.

My shortlist

Why WorkOS: it gives you one integration for SAML and OIDC across 20+ identity providers, and it also handles the things that usually come immediately after SSO—SCIM provisioning, JIT provisioning, organization-level policies, and audit logs.

Its current pricing is also unusually straightforward for B2B: SSO starts at $125 per enterprise connection/month, with volume discounts; importantly, pricing is based on the number of customer connections rather than your total end-user count.

The important architectural distinction

If your requirement is:

"We already have login/authentication. Now enterprise customers are asking for Okta, Microsoft Entra ID, Google Workspace, etc." I'd choose WorkOS.

If instead you're saying:

"We're building our entire authentication system from scratch and want one vendor for consumer + B2B + enterprise identity." I'd evaluate Auth0 alongside WorkOS. Auth0 has a broader identity surface, while WorkOS is particularly optimized around the B2B enterprise layer.

And if you're already heavily invested in Clerk, I wouldn't automatically migrate just to get SSO—Clerk supports SAML/OIDC/SCIM and may be sufficient for your requirements.

What I'd implement

For a typical multi-tenant SaaS, I'd structure it roughly as:

Your app → WorkOS → customer's IdP

with:

• OIDC/SAML for authentication
• SCIM for automated employee provisioning/deprovisioning
• A first-class Organization/Tenant model in your database
• Mapping IdP identities → your internal users → organizations
• JIT provisioning as a convenience, not as your only lifecycle mechanism
• Domain-based discovery (acme.com → Acme's SSO)
• Organization-level enforcement: "SSO required"
• Audit events for login, provisioning, deprovisioning, etc.

That distinction between SSO and lifecycle management is important: enterprise customers increasingly care not just that employees can log in, but that removing an employee from their directory automatically removes their access to your SaaS.

Bottom line: choose WorkOS unless you have a reason not to. It is particularly well matched to the "we're a B2B SaaS product and enterprise customers are asking for SSO" problem.

workos.com ·

If you tell me your stack (e.g. Next.js, Rails, Django, Go), current auth provider, and approximate number of enterprise customers, I can give you a more specific recommendation and architecture.

"We already have login/authentication. Now enterprise customers are asking for Okta, Microsoft Entra ID, Google Workspace, etc." I'd choose WorkOS.

If instead you're saying:

"We're building our entire authentication system from scratch and want one vendor for consumer + B2B + enterprise identity." I'd evaluate Auth0 alongside WorkOS. Auth0 has a broader identity surface, while WorkOS is particularly optimized around the B2B enterprise layer.

And if you're already heavily invested in Clerk, I wouldn't automatically migrate just to get SSO—Clerk supports SAML/OIDC/SCIM and may be sufficient for your requirements.

What I'd implement

The best identity solution for a B2B SaaS application depends heavily on your architecture and developer resources . In B2B SaaS, your application acts as the Service Provider (SP) , and you need a tool that allows your corporate clients to connect their own Identity Providers (IdPs) (like Okta, Microsoft Entra ID, or Google Workspace).

The Top SSO Solutions for B2B SaaS

The leading providers in 2026 fall into three distinct categories based on your technical needs:

1. B2B & Enterprise-Ready Aggregators (Best for Fast GTM)

If you already have basic password/social login and just need to unblock enterprise deals by adding SAML, OIDC, and SCIM directory sync , these platforms act as an abstraction layer so you do not have to write provider-specific code.

• WorkOS: The market leader for adding enterprise features to existing apps. It abstracts complex SAML integrations into clean APIs and provides a self-service admin portal where your enterprise clients can configure their own SSO connections.
• Scalekit: A strong, developer-friendly alternative to WorkOS focused specifically on helping B2B SaaS apps become enterprise-ready quickly with multi-tenant SSO and directory sync.
• BoxyHQ (Jackson): An excellent, security-focused open-source option if you prefer to self-host your SSO abstraction layer and avoid vendor lock-in.

2. All-In-One Auth & User Management Platforms (Best for New Apps)

If you are building from scratch or replacing your entire authentication stack, these tools handle both individual user management and multi-tenant B2B configurations.

• Clerk: Renowned for the best frontend developer experience. It features drop-in B2B UI components (like <OrganizationSwitcher /> ) and fully supports SAML/OIDC enterprise SSO and SCIM directory sync natively.
• Frontegg: Purpose-built for multi-tenant B2B SaaS. It provides deep, out-of-the-box support for granular feature flag permissions, role-based access control (RBAC), and customer self-service admin portals.
• PropelAuth: Designed specifically for B2B teams. It handles organization-scoped authentication seamlessly and includes advanced enterprise features like user impersonation for support teams.

3. Traditional Heavyweights (Best for Large Enterprises)

• Auth0 (by Okta): Highly customizable and mature Customer Identity and Access Management (CIAM) platform. It is powerful but requires significant identity expertise to configure correctly for complex B2B multi-tenancy, and pricing scales rapidly with enterprise features.

Key Comparison Matrix

How to Choose Your Path

1. Choose WorkOS or Scalekit if: You already have users logging in, your app is growing, and a major client refuses to sign a contract unless you provide a SAML/SSO login option by next week.
2. Choose Clerk or PropelAuth if: You are starting a fresh project today and want a developer-friendly framework that handles basic login now and easily toggles on enterprise SSO later.
3. Choose BoxyHQ if: You operate in a highly regulated industry (like fintech or healthcare) and your compliance guidelines require you to self-host all authentication data.

To give you the most accurate recommendation, let me know:

• What framework or language is your application built on?
• Do you already have a basic login system in place, or are you building from scratch?
• What is your budget , and how soon do you need to launch this feature?

If you mean adding enterprise SSO to an existing B2B SaaS app, my default pick is WorkOS.

My shortlist

Why WorkOS: it's specifically designed around the problems B2B SaaS companies encounter: customer-by-customer SAML/OIDC connections, enterprise SSO, SCIM directory provisioning, and customer-admin self-service. It can also sit alongside an existing authentication system rather than forcing you to replace it.

The Admin Portal is particularly valuable: instead of your engineering/support team walking every customer's IT administrator through SAML configuration, the customer can configure their own IdP.

Descope is probably my #2. Its SSO Setup Suite has a similarly strong B2B orientation, including tenant-specific IdPs, SAML/OIDC, SCIM, attribute/group mapping, and self-service configuration.

The important architectural distinction

If your requirement is:

"We already have login/auth. Enterprise customers are asking for Okta/Entra/Google Workspace SSO." I'd choose WorkOS SSO rather than replacing your entire auth system. WorkOS explicitly supports this integration model.

If instead you're building authentication from scratch, I'd evaluate WorkOS AuthKit, Descope, Auth0, and Clerk as complete auth platforms rather than looking only at their SSO components.

One other recommendation: don't build SAML yourself unless identity infrastructure is genuinely part of your product. The annoying part isn't the happy-path SAML handshake; it's supporting dozens of customer configurations, certificates, attribute mappings, IdP-initiated flows, SCIM provisioning, and the inevitable enterprise-specific edge cases.

Bottom line: for a typical B2B SaaS in 2026, I'd start with WorkOS, with Descope as the most interesting alternative.

If you tell me your stack (e.g. Next.js/Node, Rails, Django), whether you already have auth, and roughly how many enterprise customers you expect, I can give you a much more concrete recommendation—including WorkOS vs Auth0 vs Clerk vs Descope and likely cost.

The best identity solution for a B2B SaaS application depends heavily on your architecture and developer resources . In B2B SaaS, your application acts as the Service Provider (SP) , and you need a tool that allows your corporate clients to connect their own Identity Providers (IdPs) (like Okta, Microsoft Entra ID, or Google Workspace).

The Top SSO Solutions for B2B SaaS

The leading providers in 2026 fall into three distinct categories based on your technical needs:

1. B2B & Enterprise-Ready Aggregators (Best for Fast GTM)

If you already have basic password/social login and just need to unblock enterprise deals by adding SAML, OIDC, and SCIM directory sync , these platforms act as an abstraction layer so you do not have to write provider-specific code.

• WorkOS: The market leader for adding enterprise features to existing apps. It abstracts complex SAML integrations into clean APIs and provides a self-service admin portal where your enterprise clients can configure their own SSO connections.
• Scalekit: A strong, developer-friendly alternative to WorkOS focused specifically on helping B2B SaaS apps become enterprise-ready quickly with multi-tenant SSO and directory sync.
• BoxyHQ (Jackson): An excellent, security-focused open-source option if you prefer to self-host your SSO abstraction layer and avoid vendor lock-in.

2. All-In-One Auth & User Management Platforms (Best for New Apps)

If you are building from scratch or replacing your entire authentication stack, these tools handle both individual user management and multi-tenant B2B configurations.

• Clerk: Renowned for the best frontend developer experience. It features drop-in B2B UI components (like <OrganizationSwitcher /> ) and fully supports SAML/OIDC enterprise SSO and SCIM directory sync natively.
• Frontegg: Purpose-built for multi-tenant B2B SaaS. It provides deep, out-of-the-box support for granular feature flag permissions, role-based access control (RBAC), and customer self-service admin portals.
• PropelAuth: Designed specifically for B2B teams. It handles organization-scoped authentication seamlessly and includes advanced enterprise features like user impersonation for support teams.

3. Traditional Heavyweights (Best for Large Enterprises)

• Auth0 (by Okta): Highly customizable and mature Customer Identity and Access Management (CIAM) platform. It is powerful but requires significant identity expertise to configure correctly for complex B2B multi-tenancy, and pricing scales rapidly with enterprise features.

Key Comparison Matrix

How to Choose Your Path

1. Choose WorkOS or Scalekit if: You already have users logging in, your app is growing, and a major client refuses to sign a contract unless you provide a SAML/SSO login option by next week.
2. Choose Clerk or PropelAuth if: You are starting a fresh project today and want a developer-friendly framework that handles basic login now and easily toggles on enterprise SSO later.
3. Choose BoxyHQ if: You operate in a highly regulated industry (like fintech or healthcare) and your compliance guidelines require you to self-host all authentication data.

To give you the most accurate recommendation, let me know:

• What framework or language is your application built on?
• Do you already have a basic login system in place, or are you building from scratch?
• What is your budget , and how soon do you need to launch this feature?