Best auth for B2B SaaS, sorted by whether you need SSO yet
Best auth for B2B SaaS compared by the question that actually decides it: do you need enterprise SSO this quarter, or organizations and roles first.
In short
Most 'best auth for B2B SaaS' roundups assume day-one enterprise SSO. Most early B2B teams don't have that buyer yet - they need organizations, roles and workspace isolation. Auth0, Clerk, WorkOS and Kinde all ship SSO; BuildBase does not. Here is which tool fits which stage.
Every "best auth for B2B SaaS" roundup on page one was written by a company that sells enterprise SSO. Naturally, they all rank providers on how well each does enterprise SSO. Fine axis, if a security questionnaire is already on your desk. Wrong one if you're still building the product and don't have an enterprise buyer yet.
The one-paragraph answer
If an enterprise buyer's security review already has SAML or SSO on it, pick Auth0, Clerk, WorkOS or Kinde - all four ship it, and arguing around that gap wastes a sales cycle. If you're earlier than that - shipping organizations, roles and workspace isolation for a B2B product that hasn't fielded an enterprise security review yet - BuildBase covers that shape without the SSO layer none of your customers are asking for. It's a real gap, not a hedge: BuildBase does not support SAML or enterprise SSO connections today.
Two different jobs wearing the same label
"B2B SaaS auth" gets used for two things that aren't the same problem. One is multi-tenancy: organizing customers into isolated accounts, each with its own members and permissions, so a support rep at Acme can't see Widgets Inc's data. The other is enterprise SSO: letting a customer's own identity provider, Okta or Entra ID or Google Workspace, authenticate its employees into your app on the customer's terms.
Every B2B SaaS product needs the first one on day one. Most don't need the second until an enterprise deal is already in motion - and by then, whether SSO is a checkbox you have or a checkbox you're missing is usually decided already, months earlier, by which auth provider got wired in first.
Key takeaway
Multi-tenancy (organizations, roles, isolated data) is a day-one requirement for B2B SaaS. Enterprise SSO is usually a later one, tied to a specific buyer's security review, not to launch. Sorting the field by which stage each tool actually serves beats sorting by SSO depth alone.
Where each one fits
Auth0 - the deepest identity platform, if SSO is already the ask. Auth0 is the most protocol-complete option here: SAML, OIDC, and a B2B product line with per-connection enterprise pricing. It's priced by monthly active users starting on a free tier, with B2C and B2B tiers priced separately. If identity itself is the product's hard problem, Auth0's depth shows.
Clerk - fast to ship, SSO from the first paid tier. Clerk pairs a polished, framework-native SDK (including React Native and Vue, which BuildBase does not support) with an Organizations product for B2B membership. One enterprise SSO connection is included starting on its Pro plan, with additional connections billed per connection. Clerk also added a Stripe-backed billing product this year, though it remains an add-on rather than a bundled quota-and-metering system.
WorkOS - narrow, and built for exactly this. WorkOS does one thing: enterprise identity. SSO, SCIM directory sync, audit logs, and a self-serve Admin Portal a customer's own IT admin can configure without your team in the loop. Its free User Management product covers a large free tier of monthly active users before the enterprise-connection pricing kicks in. It has no billing and no workspace model beyond its organizations, though AuthKit does support custom roles and permissions scoped to an organization. Billing and anything workspace-shaped stay separate vendor problems.
Kinde - SSO included earlier than most. Kinde is an auth provider with subscription billing features bolted on, priced on the monthly active users you authenticate through it. It includes one enterprise SSO connection on its free and Pro tiers - unusually early compared to the field - with unlimited connections on its higher paid tier. If the roadmap includes both SSO and basic subscription billing without adding a third vendor for either, Kinde is worth a closer look before reaching for a bundle the size of BuildBase.
BuildBase - organizations and roles, no SSO. BuildBase ships eight sign-in methods (email and password, Google, LinkedIn, GitHub, Microsoft OAuth, magic links, passkeys, plus OAuth 2.0 for server-to-server calls) alongside multi-tenant workspaces and role-based access control with org-level and workspace-level roles, custom permissions and API token scoping - one piece of a 20-module bundle that also covers billing, workflows and email in the same instance. What it does not ship is enterprise SSO, SAML or SCIM, at any price. If that's the next problem on your list, it's the wrong tool for this quarter.
| Feature | BuildBase | WorkOS |
|---|---|---|
| Enterprise SSO / SAML | Not available | Core product, self-serve Admin Portal for customer IT admins |
| Organizations / workspaces | Built in, isolated data, billing and settings per workspace | Basic "Organizations" concept, not a full workspace model |
| Role-based permissions | Built in, org- and workspace-scoped roles | Custom roles and permissions, org-scoped |
| Subscription billing | Built in: plans, credits, usage quotas | Not included, bring your own Stripe |
| Sign-in methods | 8: password, 4 social/OAuth providers, magic link, passkeys, OAuth 2.0 | Email/social sign-in via User Management, plus SSO |
| Pricing shape | Flat: Launch $49/mo, Grow $99/mo, Scale $199/mo | Free to a large MAU ceiling, then priced per SSO/SCIM connection |
Where WorkOS wins
Enterprise SSO, SCIM and a self-serve Admin Portal, done by specialists. WorkOS, and to a lesser extent Auth0, Clerk and Kinde, all ship SAML or enterprise SSO connections today. BuildBase does not ship any of it - no SAML, no enterprise SSO, no SCIM directory sync. If a buyer's security team has any of those on a questionnaire this quarter, every one of the other four tools on this page beats BuildBase outright, and there is no way to argue around that gap.
How to actually decide
Don't start from the feature list. Start from whether an enterprise security review is already scheduled. If it is, the choice is between Auth0, Clerk, WorkOS and Kinde on how they each price and package SSO - not whether to buy it at all - and Auth0 vs BuildBase, Clerk vs BuildBase and WorkOS vs BuildBase each carry the current published figures for that comparison, re-verified against the vendor's own page on the date each was written.
If no enterprise buyer has asked yet, the more useful question is how many other systems you're about to wire together around whichever auth provider you pick - billing, workspace isolation, role permissions, quota enforcement. Auth0, Clerk, WorkOS and Kinde each answer identity well and leave some or all of the rest to other vendors. BuildBase answers the rest and deliberately leaves SSO undone. Whichever gap you'd rather have on your desk twelve months from now is the actual decision, not which provider's login screen looks best today.
A note on sourcing: no dollar figure for Auth0, Clerk, WorkOS or Kinde appears above - only the shape of each plan, which was re-checked against each vendor's own pricing page on 24 September 2026. Each vendor's actual numbers are re-verified on the date printed on its own comparison post - 20 August 2026 for Auth0, 14 August 2026 for Clerk and Kinde, 15 August 2026 for WorkOS - and quoted there, not repeated here. Check the linked post, or the vendor's own page, before budgeting against any of them. BuildBase's own figures come from PLANS and PLAN_FACTS in packages/shared/src/constants/platform-stats.ts, verified 9 September 2026.