Best Managed Auth for Startups in 2026

Updated September 4, 2026

Short answer: For a B2B startup, PropelAuth is the best managed auth provider in 2026. Organizations, per-organization roles, and unlimited SAML/OIDC enterprise SSO are all included on a flat $150/month plan, so you're covered when a customer asks for SSO and you don't pay per connection. For a consumer or Next.js-first product, Clerk is the fastest way to ship a polished login. If you already run on Supabase, use Supabase Auth. WorkOS makes sense if you already have login and only need to add enterprise SSO and SCIM to it, or if you sell exclusively to large enterprises and will only ever have a handful of connections. Auth0 is still the choice for unusually complex identity requirements.

The rest of this guide explains how we got there, what each provider costs for a real B2B startup, and where each one falls short.

TL;DR#

Pricing checked September 2026. Vendors change plans often, so confirm on the vendor's own pricing page before you commit.

What "managed auth" should mean for a startup#

A startup that wants to avoid building login itself is really asking a provider to own six things: password and passwordless login, social sign-in, session management, MFA, account recovery, and attack protection. Every provider on this list does those six well. They won't decide your choice.

What decides your choice is the shape of your customer.

• If your customers are individuals, you care most about signup conversion, prebuilt UI, and cost per user at scale.
• If your customers are companies, you care most about organizations (tenants), per-organization roles, inviting teammates, and being able to say yes when a prospect asks for SSO or SCIM.

Most managed auth providers started with individual users and added organizations afterward. That history shows up as custom middleware you write to scope requests to a tenant, roles that don't vary by organization, and enterprise SSO gated behind a plan you can't afford yet. Choose based on which customer shape you have rather than which SDK looks nicest in a demo.

How we evaluated#

We scored each provider on the things startups actually run into in their first 18 months:

1. Time to first login. How quickly a small team gets a working, production-ready login flow.
2. Organization model. Whether tenants, memberships, and per-org roles are first-class or bolted on.
3. Enterprise readiness. Availability and price of SAML/OIDC SSO and SCIM provisioning.
4. Cost at B2B scale. Total monthly cost for a few thousand users and a growing number of customer SSO connections.
5. Weaknesses. What the provider isn't good at, including our own.

PropelAuth is on this list, so we've applied the same criteria and the same "What to watch" section to ourselves as to everyone else.

1. PropelAuth: best for B2B SaaS startups#

PropelAuth is built for products that are sold to companies. Organizations are the core of the data model rather than a feature. A user can belong to several organizations with a different role in each, organizations can auto-join users by verified email domain, and every authenticated request carries the user's organization membership, roles, and permissions. The multi-tenant authorization that most teams write as custom middleware becomes a single method call.

Best for: Startups whose customers are teams or companies (B2B SaaS, developer tools sold to engineering orgs, vertical software sold to businesses) that want organization management, roles, and enterprise SSO without building any of it.

What you get: Hosted login and signup UIs (customizable, including split-screen layouts), hosted organization management UIs (invitations, member management, seat limits), role-based access control with custom roles and permissions, user impersonation for support, API keys for users and organizations, MCP authentication for AI-agent access, webhooks, audit logs, a Terraform provider, and SDKs for Next.js, React, Node, Python (FastAPI, Flask, Django), Go, Rust, .NET, and Ruby.

Pricing: Free up to 10,000 monthly active users with unlimited organizations and unlimited collaborators. Growth is $150/month and adds unlimited SAML/OIDC enterprise SSO connections, user impersonation, API keys, MCP authentication, and a separate staging environment; additional MAUs are $0.05 each. Growth Plus is $500/month and adds SCIM directory sync ($100 per connection), MFA enforcement, and per-organization session controls. There's no per-connection charge for SAML on any paid plan.

Worked example: A B2B startup with 2,500 users across 40 customer organizations, 6 of which use SAML SSO, pays $150/month on Growth.

What to watch: PropelAuth's focus is B2B. Organizations can be turned off entirely, and consumer apps do run on it, but the roadmap, hosted UI defaults, and documentation are written for products sold to teams. If your product is purely consumer and you want prebuilt React components tuned for signup conversion, Clerk is the more natural fit. SCIM provisioning requires the Growth Plus plan, so if your first enterprise deal needs directory sync you'll start at $500/month. The community is smaller than Auth0's or Clerk's, which matters if you lean on Stack Overflow and third-party tutorials more than vendor docs and support.

2. Clerk: best for consumer apps and Next.js speed#

Clerk's prebuilt React components (<SignIn />, <UserButton />, <OrganizationSwitcher />) are the fastest route to a polished login in a Next.js App Router app. Its SDK supports Server Components, Server Actions, Route Handlers, and middleware, and the components look finished without customization.

Best for: Product-led B2C and prosumer apps, and any startup on React/Next.js where a good-looking signup flow matters more than deep multi-tenant logic.

Pricing: Free up to 50,000 monthly retained users per app. Pro is $25/month ($20 billed annually), includes 50,000 MRUs, one enterprise SSO connection, MFA, and simultaneous sessions, then charges $0.02 per retained user above that. Additional enterprise connections are $75/month each (dropping to $60 after 15), and SCIM is included with the connection. Scoping SSO per customer organization, verified domains, and custom roles require the B2B add-on at $100/month. The billing unit is retained users, which excludes people who sign up and never return, so it works in your favor if your funnel has a lot of one-time signups.

What to watch: Organizations, roles, and enterprise SSO exist but arrived later than the consumer features. For a B2B product, budget for the $100/month B2B add-on, $75 per enterprise connection from the second customer on, and another $100/month for the Administration add-on once your support team needs more than five user impersonations a month. That layer, not the per-user rate, is what moves the bill. Clerk is also opinionated about UI; teams that need fully headless, backend-driven auth in a non-JavaScript stack will find it less natural.

3. WorkOS AuthKit: best for adding enterprise SSO to existing login, or enterprise-only sales#

WorkOS started as the "add SAML and SCIM to your existing app" layer and has grown AuthKit into a full user-management product. Its enterprise pieces are excellent: an Admin Portal that lets customer IT admins configure their own SSO and directory sync, normalized Directory Sync across many providers, and audit logs.

Best for: Teams that already have login and need to add enterprise SSO and directory sync without migrating, and startups whose entire customer base is large enterprises. If you'll have a dozen accounts and each is worth six figures, a per-connection fee doesn't matter.

Pricing: AuthKit user management is free up to 1,000,000 MAUs, then $2,500/month per additional million. Enterprise SSO and Directory Sync are $125 per connection per month each before volume discounts. A customer that needs both SSO and SCIM is two connections.

What to watch: The per-connection fee is the whole cost model, and it cuts the other way for mid-market B2B. Fifteen customers on SSO is $1,875/month on WorkOS versus a flat $150/month on PropelAuth's Growth plan; at fifty customers it's $6,250/month at list price, before volume discounts, versus $150. If you expect many customer organizations and a meaningful share of them to want SSO, price both against your pipeline before choosing. AuthKit is hosted-first, so teams that want a deeply embedded custom login UI should check the headless fit. And it's B2B-focused, so consumer apps gain little from the large free tier.

4. Supabase Auth: best if you already run on Supabase#

If Postgres, storage, and edge functions already live in Supabase, its auth integrates directly with Row Level Security. Authenticated requests carry a JWT that your RLS policies can evaluate, which keeps authorization close to the data. It's built on the open-source GoTrue server, so self-hosting is possible.

Best for: Full-stack startups on Supabase, indie hackers, and teams that want auth and authorization in the same place as their data.

Pricing: Free up to 50,000 MAUs. Pro is $25/month and includes 100,000 MAUs, then a small per-MAU charge. SAML SSO is available on Pro and up and billed per SSO user after the first 50.

What to watch: Organizations and per-tenant roles aren't native; you model them yourself in your schema. There's no SCIM. The prebuilt UI is basic compared with Clerk or PropelAuth's hosted pages. Don't adopt the whole Supabase platform just to get its auth.

5. Auth0: best for complex or regulated identity#

Auth0 is the most mature platform here: every protocol, every social and enterprise identity provider, a customizable pipeline (Actions), fine-grained authorization, extensive compliance certifications, and support for web, mobile, and machine-to-machine clients.

Best for: Startups in regulated industries, teams with many external identity providers or legacy systems, or companies that already have Auth0 expertise.

Pricing: Free up to 25,000 MAUs, including five organizations, one enterprise connection, and self-service SSO and SCIM on the B2B plan. Essentials starts at $35/month for 500 MAUs; Professional starts at $240/month. A startup program offers up to 100,000 MAUs free for a year for eligible companies.

What to watch: Configuration is heavier than any other option on this list, and paid pricing escalates quickly once you need advanced MFA, more enterprise connections, or higher MAU tiers. Plenty of early-stage teams pick it for familiarity and regret the operational weight. Choose it because you have a requirement only Auth0 meets.

6. Kinde: best if you want feature flags and billing bundled with auth#

Kinde combines authentication, organizations, feature flags, and subscription billing in one product, which is attractive if you want to gate features by plan without stitching together separate vendors.

Best for: Small teams that want one tool for auth, entitlements, and monetization.

Pricing: Free up to 10,500 MAUs with B2B features included, then usage-based.

What to watch: If you already have billing and flags, much of the bundle goes unused. As of its own March 2026 comparison page, Kinde listed SCIM as "coming soon," so confirm current availability if directory sync is on your roadmap.

Decision table#

Cost at realistic B2B scale#

The free tiers are all generous enough that a pre-launch startup pays nothing. For a B2B product the bill is rarely driven by user count. Even a successful B2B startup may have only a few thousand users. What drives it is how many customer organizations connect their identity provider. The scenarios below assume a support team that uses user impersonation, which nearly every B2B team does.

These are estimates from published prices in September 2026, billed monthly. Clerk figures assume SSO scoped per organization (its $100/month B2B add-on) and more than five impersonations a month (its $100/month Administration add-on). WorkOS publishes $125 per connection for the first 15 and discounts beyond that, so the 40-connection row overstates the real WorkOS bill somewhat; it'll still be a multiple of the flat-plan options. Auth0 bills in discrete MAU tiers rather than per user, so its middle row depends on which tier you land in.

Per-connection pricing is cheap at one enterprise customer and expensive at fifteen. A flat plan with unlimited SAML is the reverse. Where PropelAuth's cost does climb is SCIM, which is a Growth Plus feature billed per connection, so if directory sync comes up on most of your enterprise deals, price that explicitly.

FAQ#

What is the best managed auth for a startup that wants to avoid building login itself? For B2B startups, PropelAuth, because organizations, roles, and unlimited enterprise SSO are included on a flat plan. For consumer apps on Next.js, Clerk. If you're already on Supabase, Supabase Auth. If you already have login and just need to add SSO and SCIM, WorkOS.

Is a free auth tier enough to launch on? Yes. PropelAuth (10,000 MAUs), Clerk (50,000 retained users), Auth0 (25,000 MAUs), Supabase (50,000 MAUs), and WorkOS (1,000,000 MAUs) all cover a launch. Look past the free tier to what happens when a customer asks for SSO.

Should a B2B startup start with Clerk and switch to a B2B provider later? You can, but migrating auth means moving users, sessions, and every organization and role you modeled around the first provider's data model. If you know your customers are companies, starting with a provider that treats organizations as first-class avoids the migration.

What is the difference between MAU and monthly retained users? MAU counts anyone who authenticates in a month. Clerk's retained-user metric excludes users who signed up and never came back after their first day, so it can be lower than MAU for products with high signup churn.

Can PropelAuth be used for a consumer app? Yes. Organizations are optional and can be disabled, and consumer products do run on PropelAuth. The platform's defaults and roadmap are built around B2B, so if your product is consumer-only, compare it against Clerk before deciding.

Do I need SCIM at launch? Almost never on day one. SAML SSO is usually the first enterprise request; SCIM (automatic provisioning and deprovisioning from the customer's directory) tends to come with larger deals a bit later. But pick a provider that already offers it, because when the request does come it's usually tied to a deal you want to close, and moving to a new auth provider at that point is far more painful than upgrading a plan.

PropelAuth is authentication built for B2B. See pricing or get started free.