The 5 best AWS Cognito alternatives for B2B SaaS in 2026

Amazon Cognito is often the default choice for authentication when you are already building on AWS. It integrates neatly with Lambda, API Gateway, and IAM, and the free tier covers up to 50,000 monthly active users. For straightforward consumer apps that live entirely inside the AWS ecosystem, Cognito can be a reasonable starting point.

But if you are building a B2B SaaS product, you will likely run into Cognito's limitations well before you run out of its free tier. The further you push into enterprise sales, the more obvious it becomes that Cognito was designed as a general-purpose identity primitive, not as an authentication platform for software that sells to other businesses.

This guide covers the most common reasons engineering teams move away from Cognito and evaluates five alternatives based on how well they address those specific pain points.

Why teams outgrow Cognito

Before comparing alternatives, it is worth understanding the recurring problems that drive B2B SaaS teams to look elsewhere. These are the issues we hear about most often.

No native multi-tenancy

Cognito's data model is user-centric, not organization-centric. It has no built-in concept of tenants, organizations, or account-level hierarchies. If your product needs to support multiple organizations with their own users, roles, and SSO configurations, you have to build all of that mapping yourself using custom attributes, Lambda triggers, and application logic.

This works at small scale, but it becomes increasingly fragile as you add more enterprise customers with unique identity requirements. What starts as a few custom attributes eventually grows into a parallel identity system running alongside Cognito.

Limited enterprise SSO support

Cognito supports SAML and OIDC federation, but only as a service provider. It cannot act as an identity provider, which limits how you can offer SSO to enterprise customers. Setting up a new SSO connection for each customer requires manual configuration, and there is no self-service portal where your customers' IT teams can configure their own identity provider.

For B2B SaaS products that are starting to close enterprise deals, the SSO onboarding process with Cognito often becomes a bottleneck that involves your engineering team in every new customer setup.

Rigid and difficult to customize hosted UI

Cognito's hosted login UI lets you set a logo and adjust some colors, but that is about it. You cannot restyle the layout, reorder form fields, add custom steps to the registration flow, or implement branded experiences that match your product's design language.

Teams that need more control have to bypass the hosted UI entirely and build their own login pages on top of the Cognito APIs, which adds significant development time. Estimates from teams who have done this put the custom UI effort at 40 to 60 hours compared to just a few hours with purpose-built authentication platforms.

Confusing pricing at scale

Cognito's pricing appears affordable at first glance, but the cost structure becomes harder to predict as you grow. Advanced security features, MFA, and SAML/OIDC federation connections each carry their own pricing dimensions. Teams frequently report surprise cost increases when enabling features they assumed were included.

The pricing model also does not align well with B2B revenue models. You pay based on monthly active users across your entire platform rather than per enterprise customer or per connection, which makes it difficult to tie authentication costs directly to the customers generating that revenue.

AWS lock-in and migration difficulty

Cognito is tightly coupled to the AWS ecosystem. Integrating with non-AWS services, hybrid cloud setups, or on-premises infrastructure is difficult and often requires workarounds. More critically, Cognito does not allow you to export user password hashes. If you decide to migrate away, your users may need to reset their passwords, creating friction and potential churn during the transition.

Poor developer experience

Cognito's documentation is a frequent source of frustration. Error messages are often cryptic, debugging requires deep familiarity with CloudFormation and Lambda triggers, and certain configuration changes (like modifying custom attributes or changing username settings) require destroying and recreating the entire user pool. The learning curve is steep even for experienced AWS engineers, and the time spent troubleshooting Cognito is time not spent building your product.

The 5 best Cognito alternatives for B2B SaaS

With those pain points in mind, here is how five alternatives stack up. We have evaluated each one based on how directly it addresses the problems outlined above.

1. WorkOS

WorkOS is an enterprise authentication platform built specifically for B2B SaaS applications. It provides AuthKit, a complete authentication solution with pre-built UI components, along with enterprise features like SSO, Directory Sync, and fine-grained authorization.

Key features

• Organization-native multi-tenancy: The data model is built around organizations as the primary unit of identity, not individual users. Each of your customers gets their own tenant with isolated users, roles, SSO configuration, and directory sync settings with no custom mapping logic required.
• Enterprise SSO: Native SAML and OIDC support for any identity provider including Okta, Azure AD, Google Workspace, and more. Your customers' IT administrators can configure their own SSO connections through a self-service Admin Portal, removing the engineering bottleneck that Cognito creates.
• SCIM directory sync: Automated user provisioning and deprovisioning that enterprises expect, with real-time synchronization from any corporate directory. Handles the "remove this employee immediately" requests that inevitably arrive.
• AuthKit: A complete, customizable authentication UI built on Radix components. Supports email and password, social login, magic links, passkeys, MFA, and passwordless authentication out of the box. Go headless with the APIs and SDKs if your product requires a fully custom UI.
• Audit logs: Tamper-proof event logging for SOC 2, HIPAA, and GDPR compliance, with SIEM streaming to platforms like Splunk and Datadog.
• Radar: Real-time bot detection, credential stuffing prevention, and fraud monitoring that protects login flows without adding friction for legitimate users.
• Fine-grained authorization: Role-based access control with customizable permissions and organization-level policy enforcement.
• 1 million free MAUs: AuthKit is free for up to 1 million monthly active users, which is 20 times Cognito's free tier. Enterprise SSO and Directory Sync are priced per connection with automatic volume discounts, aligning costs directly with enterprise revenue.
• Broad SDK support: SDKs for Node.js, Python, Ruby, Go, Java, Laravel, and Next.js, with documentation that is consistently cited as some of the best in the auth space.
• Cloud-agnostic with on-prem option: Works with any infrastructure setup. No AWS dependency, no vendor lock-in. For organizations with strict data residency or compliance requirements, WorkOS also supports on-prem deployment.

Best for

B2B SaaS teams that need enterprise-ready authentication and want to stop building identity infrastructure from scratch. If your roadmap includes SSO, SCIM provisioning, or multi-tenancy, WorkOS provides these natively instead of requiring months of custom development on top of a general-purpose auth service.

Trade-offs

If you are building a simple consumer app with no enterprise requirements on the horizon, WorkOS's B2B-focused feature set may be more than you need today. The upside is that you will not need to re-platform when your first enterprise customer asks for SSO.

2. Auth0

Auth0 (now part of Okta) is one of the most established identity platforms on the market. It offers a broad range of authentication and authorization capabilities spanning both consumer and enterprise use cases.

Key features

• Universal login: A customizable hosted login page that supports social, enterprise, and database authentication methods with extensive branding options.
• Actions system: Custom logic hooks at various points in the authentication flow, replacing the Lambda trigger complexity that Cognito requires.
• Organizations: Multi-tenancy support through organizational units with per-organization SSO configuration.
• Broad protocol support: SAML, OIDC, OAuth 2.0, and a marketplace of pre-built integrations with identity providers and third-party services.
• Large developer ecosystem: SDKs for most languages and frameworks, extensive documentation, and a large community.

Best for

Teams that need a broadly capable identity platform and have the engineering resources to manage its complexity. Auth0's breadth makes it suitable for products that serve both consumer and enterprise customers.

Trade-offs

• Pricing scales steeply with usage. The free tier includes 25,000 MAUs, but many B2B features like enterprise connections and advanced MFA policies require higher-tier plans. Costs can become unpredictable, and the plan structure has undergone changes since the Okta acquisition.
• Configuration complexity. Auth0 is flexible but that flexibility comes with a large surface area of settings, rules, and hooks that require careful management. The learning curve is significant.
• No self-service admin portal for customers. Enterprise SSO onboarding still requires your team's involvement rather than allowing your customers' IT admins to configure their own connections.
• Migration can be difficult. Auth0 encourages deep integration, which creates switching costs if you need to move away later.

3. Keycloak

Keycloak is an open-source identity and access management solution maintained by the Cloud Native Computing Foundation. It is one of the most widely deployed open-source auth platforms, particularly in enterprise and government environments.

Key features

• Full infrastructure control: Deploy on any cloud, on-premises, or in hybrid environments. All identity data stays in your own database with full access to password hashes for migration.
• SSO via SAML and OIDC: Comprehensive protocol support with identity brokering and user federation for LDAP and Active Directory.
• Realm-based multi-tenancy: Isolated identity environments for different customers or business units through the realm system.
• Admin console: Web-based interface for managing users, authentication flows, security policies, and identity operations.
• Customizable authentication flows: Configurable login sequences including conditional steps, custom authenticators, and adaptive policies.

Best for

Teams with strong infrastructure engineering capabilities that need full control over their identity stack and cannot accept vendor lock-in.

Trade-offs

• You run and maintain everything. Deployment, scaling, high availability, upgrades, and security patching are entirely your team's responsibility. The operational overhead is significant and ongoing.
• Complex initial setup. Configuring Keycloak for a production B2B SaaS use case requires understanding its realm model, client configurations, flow system, and theme engine. Troubleshooting often involves digging through Java stack traces.
• No managed hosting from the upstream project. You need a third-party provider for hosted Keycloak, which reduces the cost advantages of open source.
• No SCIM support out of the box. Directory sync requires custom development or third-party extensions.
• Developer experience lags behind modern platforms. The admin interface and configuration workflow reflect Keycloak's enterprise Java heritage rather than the API-first approach that most SaaS developers expect.

4. SuperTokens

SuperTokens is an open-source authentication solution that takes a lighter-weight approach than Keycloak. It offers both a self-hosted version (completely free with no user limits) and a managed cloud service.

Key features

• Modular architecture: Pick only the authentication features you need (email and password, social login, passwordless, session management) without configuring a full identity platform.
• Full data ownership: Self-hosted version stores everything in your own database with no restrictions on exporting password hashes, solving the migration lock-in that Cognito creates.
• Pre-built UI components: Embeddable login and signup interfaces that give you more design control than Cognito's hosted UI.
• Managed cloud option: Priced per MAU starting with 5,000 free users, with straightforward scaling.
• Fast setup: Most teams report getting a working implementation running in under a day, significantly faster than Cognito or Keycloak.

Best for

Teams that want a lightweight, open-source authentication layer they can run alongside their existing stack without a heavy operational lift. A good fit for earlier-stage products that need better core auth than Cognito but are not yet at the stage of needing enterprise SSO.

Trade-offs

• Limited enterprise B2B features. SAML-based SSO, SCIM directory sync, and organization management are less mature than platforms built specifically for B2B SaaS. If your near-term roadmap includes enterprise sales, you will likely need to supplement SuperTokens with additional tooling.
• Smaller ecosystem. Fewer community resources, integration examples, and third-party guides than Auth0 or Keycloak.
• Narrower SDK coverage. Backend support covers Node.js, Python, and Go with React on the frontend, but other languages and frameworks have more limited support.
• Self-hosted version requires operational investment. While lighter than Keycloak, you are still responsible for keeping the infrastructure running and up to date.

5. FusionAuth

FusionAuth is a commercial authentication platform that offers both a free self-hosted Community edition and paid tiers with additional features and support.

Key features

• Flexible deployment: Self-host on your own infrastructure, run as a private single-tenant cloud instance, or install through the AWS Marketplace to keep billing consolidated through AWS.
• Native multi-tenancy: Each tenant gets isolated configuration for users, applications, and authentication policies without the custom mapping logic that Cognito demands.
• Broad migration support: Documentation covers data imports from multiple sources with support for a wide range of password hashing schemes, making the transition from Cognito smoother than many alternatives.
• Themeable per tenant: Backend admin GUI and API-based customization with the ability to create themes per tenant or application.
• Free Community edition: Core authentication features for unlimited users at no cost.

Best for

Teams that want a commercially supported, self-hostable authentication platform with strong migration tooling and the option to keep billing through AWS. A practical choice for teams that want more than Cognito without leaving the AWS billing ecosystem entirely.

Trade-offs

• Enterprise features are gated behind paid plans. SAML SSO, advanced MFA, and premium support require upgrading from the free Community edition. Paid tiers start at $125 per month.
• Self-hosting means operational responsibility. Even with the single-tenant cloud option, you take on more infrastructure management than with a fully managed platform.
• Smaller developer community. Fewer community-contributed integrations, guides, and Stack Overflow answers than Keycloak or Auth0. The FusionAuth team provides responsive support, but self-service resources are less extensive.
• No self-service admin portal for customers. Enterprise SSO onboarding requires configuration through the FusionAuth admin interface rather than a customer-facing portal.

How to choose the right alternative

The right choice depends on where your product is today and where it is heading.

• Choose WorkOS if you are building B2B SaaS and your roadmap includes selling to companies that will need SSO, directory sync, and compliance-ready audit logs. WorkOS provides multi-tenancy, enterprise SSO, SCIM, audit logs, and a self-service admin portal natively, so your team can focus on building product instead of building auth infrastructure.
• Choose Auth0 if you need a broadly capable identity platform that handles both consumer and enterprise authentication and your team has the engineering resources to manage its configuration complexity.
• Choose Keycloak if you have a strong infrastructure team, need full control over your identity stack, and cannot accept vendor lock-in. Be realistic about the ongoing operational investment.
• Choose SuperTokens if you want lightweight, open-source core authentication without enterprise overhead. A good starting point, but plan for how you will handle SSO and SCIM when enterprise customers start asking.
• Choose FusionAuth if you want a commercially supported, self-hostable platform with strong migration tooling and the option to keep billing through AWS Marketplace.

Conclusion

Amazon Cognito can work as a starting point for authentication on AWS, but B2B SaaS teams consistently hit the same walls: no native multi-tenancy, limited enterprise SSO, rigid UI customization, confusing pricing, and deep AWS lock-in. The longer you build on top of those constraints, the more custom glue code you accumulate and the harder it becomes to switch.

Open-source options like Keycloak and SuperTokens give you full control over your data, but they shift operational responsibility to your team. Keycloak is powerful but heavy. SuperTokens is lightweight but lacks the enterprise B2B features that close deals. FusionAuth sits in the middle with a self-hostable commercial model and AWS Marketplace availability, though its enterprise features require paid upgrades. Auth0 offers the broadest feature set of any managed platform, but its pricing complexity and configuration overhead are common sources of friction as teams scale.

For teams building B2B SaaS, WorkOS offers the most direct path from Cognito to enterprise readiness. AuthKit provides authentication for up to 1 million users at no cost. SSO, SCIM, audit logs, and organization management work out of the box. The self-service Admin Portal lets your customers' IT teams configure their own identity providers without involving your engineers. And the per-connection pricing model aligns authentication costs directly with the enterprise customers generating revenue.

The authentication layer you choose today will likely outlast many other parts of your stack. Investing the time to get it right now saves months of rework later.

Get started with WorkOS for free and add enterprise ready authentication to your app in minutes.