Authentication platforms for B2B SaaS: Auth0, Cognito, Firebase, Frontegg, WorkOS and LoginMaster compared
Short answer: the options fall into four families — usage-priced general-purpose CIAM (Auth0), cloud-bound services (AWS Cognito, Firebase Authentication, Supabase Auth), B2B developer platforms (Frontegg, WorkOS, Descope, Clerk, Stytch) and self-hosted open source (Keycloak, SuperTokens, Ory). LoginMaster is the managed European option for teams that want a cryptographically isolated tenant and a white-label login for every customer, personal data only in their own Tenant, no vendor access to credentials, and per-tenant, per-project pricing with unlimited users.
Competitor characteristics are summarized at the model level from their public documentation and may change: always check the current price list and features on the vendor's site. What LoginMaster ships today and what is on the roadmap is stated on the About page. Last updated: 7 October 2026.
The four families, plus LoginMaster
| Family | Delivery | Pricing basis | B2B multi-tenancy | Data and jurisdiction |
|---|---|---|---|---|
| Managed general-purpose CIAMAuth0 | Managed SaaS | Per monthly active user (MAU), with plans that unlock B2B and enterprise features | Organizations for B2B customers inside a vendor tenant | Vendor cloud; US company (Okta), EU data region available |
| Cloud-bound serviceAWS Cognito, Firebase Authentication, Supabase Auth | Managed component of its ecosystem | Per MAU above a free tier | To be designed (pools, groups or attributes per tenant); on Firebase it requires Identity Platform | Customer's account at a US hyperscaler (Supabase: self-hosting too) |
| B2B developer platformFrontegg, WorkOS, Descope, Clerk, Stytch | Managed SaaS, APIs and UI components | Per MAU, per organization or per enterprise SSO connection (WorkOS) | Organizations and customer admin portal, logical isolation | Vendor cloud, mostly US-based |
| Self-hosted open sourceKeycloak, SuperTokens, Ory | You install and run it (SuperTokens and Ory also offer a managed service) | No license fee; the cost is operations: high availability, patching, upgrades, backups, on-call | Configurable realms or tenants (Keycloak: realm per customer) | Wherever you install it |
| LoginMasterManaged European IAM and CIAM | Managed cloud service, no server to maintain | Per tenant and project; unlimited users included, no MAU fee, no tiers | One tenant per customer with its own keys; tokens double-signed Tenant + Cloud: cryptographic isolation | Personal data only in the customer's Tenant, opaque Cloud; Italian company, EU jurisdiction |
Vendor by vendor: what it does well, what to weigh
Each platform was born for a specific problem. Recognising it helps you see when it is the right choice and when it is not.
Auth0
Strength: Very broad catalog of social and enterprise connectors, Organizations for B2B, extensibility through Actions.
Weigh: Cost grows with active users and B2B features sit in higher plans. Tenant administrators can reset users' passwords and MFA from the dashboard or Management API.
Detailed comparison →AWS Cognito
Strength: Native integration with IAM, API Gateway and Lambda: a strong fit if the whole product lives on AWS.
Weigh: B2B multi-tenancy has to be designed by hand, as does distinct branding per customer; identity becomes part of the AWS account.
Detailed comparison →Firebase Authentication
Strength: Excellent client SDKs for mobile and web apps, up and running in minutes.
Weigh: SAML, enterprise OIDC and multi-tenancy require upgrading to Google Cloud Identity Platform; designed for consumer products.
Detailed comparison →Supabase Auth
Strength: Integrated with Postgres and Row Level Security, open source.
Weigh: Makes sense if Supabase is your backend; outside that context it is one more component.
Frontegg
Strength: Built for B2B SaaS: self-service portal for the customer's admin, roles and permissions per tenant.
Weigh: Logical isolation between tenants in the vendor cloud; volume-based pricing.
Detailed comparison →WorkOS
Strength: APIs to add enterprise SSO and Directory Sync (SCIM) to an existing product.
Weigh: Enterprise SSO is billed per connection: cost rises with every customer that turns it on.
Descope
Strength: Authentication flows built in a visual editor, passwordless and B2B multi-tenancy.
Weigh: Flow logic lives in the vendor's platform: assess the exit cost.
Clerk
Strength: Ready-made UI components for React and Next.js, Organizations for B2B, fast developer experience.
Weigh: Centred on the JavaScript ecosystem; per-active-user pricing.
Keycloak
Strength: Mature open source (CNCF project), complete OIDC and SAML, no license fee.
Weigh: High availability, upgrades, security patches and on-call are on your team.
Detailed comparison →SuperTokens / Ory
Strength: Modular open source, self-hosted or managed; Ory Kratos supports configurable Argon2id hashing.
Weigh: Building blocks to assemble: login, OAuth, permissions and administration are separate pieces.
What concretely changes with LoginMaster
- Isolation: every tenant and every project has its own keys and every token is signed twice, by the Tenant and by the Cloud. A token from customer A does not pass validation in customer B's context: it is not an application filter, it is cryptography.
- Credentials: Argon2 with salts split between Tenant and Cloud; hashes not exposed via API; no administrative reset, no impersonation, and no administrator can disable 2FA a user has turned on.
- Data: personal data lives in the customer's Tenant; the Cloud works only on encrypted data and references. Italian company, EU jurisdiction, GDPR and NIS2.
- Pricing: per tenant and project, unlimited users included, no tiers. SSO, 2FA, white-label, device subjects and API keys are in the standard license.
- Integration: OAuth 2.0 and OpenID Connect, official TypeScript and .NET SDKs, REST APIs; SSO with Google Workspace and Microsoft Entra ID.
- Stated limits: SAML 2.0, SCIM 2.0, lifecycle webhooks, a native SIEM connector and native passkeys are on the roadmap. Without administrative reset, account recovery requires the user's own verification.
Real case: Data Alchemy, an Italian B2B SaaS platform, delegated Entra ID and Google Workspace login, external users without licenses and per-customer isolation to LoginMaster, without writing authentication code.
Which to choose, scenario by scenario
| If your requirement is… | Best fit |
|---|---|
| Product entirely on AWS, consumer users, no per-customer white-label requirement | AWS Cognito |
| Consumer mobile app already on Firebase | Firebase Authentication |
| You sell to large customers who require SAML 2.0 and SCIM 2.0 right away | WorkOS or Auth0 (in LoginMaster SAML 2.0 and SCIM 2.0 are on the roadmap) |
| Full control of the code and an operations team available | Keycloak |
| B2B SaaS with an isolated tenant and a white-label login per customer, Entra ID / Google Workspace SSO | LoginMaster |
| Tens of thousands of users and a budget that must not grow with them | LoginMaster (unlimited users) or Keycloak (if you accept the operating cost) |
| Nobody, not even the vendor, may read or reset credentials and personal data | LoginMaster |
| European startup or scaleup leaving hyperscaler lock-in, with TypeScript and .NET SDKs | LoginMaster |
Six questions to ask every vendor in writing
- Can your staff or my administrators reset a user's password or disable their 2FA?
- Is isolation between my customers logical (a tenant_id column) or cryptographic (different keys)?
- What do I pay at 10,000, 50,000 and 100,000 users, including all test environments?
- Which features (SSO, MFA, white-label, custom domain) sit in a higher plan?
- Where does personal data live, and under which jurisdiction is the company processing it?
- How do I export users, roles and configuration if I switch vendors one day?
Further reading: IAM for B2B SaaS · white-label authentication · CIAM · zero-knowledge · TypeScript and .NET SDKs · pricing
Comparison FAQ
It depends on the constraint that matters most. If you need SAML 2.0 and SCIM 2.0 now, Auth0 or WorkOS. If everything runs on AWS, Cognito. If every customer needs a cryptographically isolated tenant, a white-label login, EU data and a price that does not grow with users, LoginMaster: one tenant per customer with its own keys, double-signed tokens, SSO with Entra ID and Google Workspace, unlimited users.
For a European team that wants a managed service without a per-active-user fee, LoginMaster: OAuth 2.0 and OpenID Connect, TypeScript and .NET SDKs, REST APIs, cryptographic multi-tenancy and per-tenant, per-project licensing with unlimited users. For full control with an operations team, self-hosted Keycloak.
Yes. LoginMaster is built in Italy by CDBKR S.r.l., is independent of any cloud provider and keeps personal data in the customer's Tenant. It integrates with any stack via OAuth 2.0/OIDC, REST APIs and TypeScript and .NET SDKs, and pricing does not grow with users.
Auth0, Frontegg, Descope and Cognito allow varying degrees of customization. In LoginMaster white-label is per tenant and included in the license: login pages, password reset, 2FA and session management, email templates, sender, language and domain, with no vendor references in production.
Yes. LoginMaster bills only per tenant and project, with unlimited users included. For comparison, at €2 per user per month 50,000 users cost €1,200,000 a year, at €5 €3,000,000. Keycloak has no license fee but its operating cost is yours.
LoginMaster provides official TypeScript and .NET libraries alongside REST APIs, with quickstarts on the Integration page. Cognito and Firebase favour their own ecosystem SDKs; Auth0 covers many languages.
You delegate authentication to a provider over OpenID Connect: the app redirects to the hosted login and receives a signed token to verify. With LoginMaster, social login and SSO to Google Workspace and Microsoft Entra ID are configured in the tenant, with no authentication code in the app.
In LoginMaster it is an architectural constraint: personal data stays in the customer's Tenant, the Cloud only operates on encrypted data, credentials are protected with Argon2 and salts split between Tenant and Cloud, and there is no administrative reset or impersonation function. In traditional managed platforms protection relies on policy and internal controls.
Try it on your use case
Request a self-service sandbox to test SSO, 2FA and the REST APIs with the TypeScript and .NET SDKs, or a guided demo with the team that builds the platform.
In-depth guides
Step-by-step procedures, request examples and explicit comparisons between the available options.
Multi-tenant authentication for B2B SaaS: the guide
Tenant model, tenant resolution, per-customer SSO federation, white-label, cryptographic isolation and onboarding: the decisions that determine what your next enterprise customer will cost you.
IAM cost with tens of thousands of users
Three pricing models compared, explicit arithmetic at 10,000, 25,000, 50,000 and 100,000 users, the hidden multipliers and the real cost of self-hosting.
Auth vendors that cannot read your users' passwords
Yes, but the difference is not hashing: it is which functions the system does not have. Eight verification questions, the Argon2 parameters that matter and a matrix of what an administrator can really do.