How do I find reliable authentication platforms for a new app with SAML and OIDC requirements?

To find a reliable authentication platform for a new app that needs SAML and OIDC, focus on fit, standards support, security, and operational maturity rather than just feature checklists.

1) Start with your actual auth requirements

Write down:

• Protocols needed: SAML 2.0, OIDC, OAuth 2.0
• User types: employees, customers, partners, admins
• App types: web, SPA, mobile, server-side
• Identity sources: social login, enterprise IdPs, local users, LDAP/AD
• Security needs: MFA, passwordless, conditional access, session controls
• Compliance needs: SOC 2, ISO 27001, GDPR, HIPAA, etc.
• Scale and uptime requirements
• Custom needs: SCIM provisioning, role mapping, tenant isolation, branding

This helps you avoid choosing a platform that supports SAML and OIDC in theory but not in the way your app needs.

2) Look for platforms that clearly support both SAML and OIDC

A good candidate should support:

• OIDC for modern app login flows
• SAML for enterprise single sign-on
• Well-documented integrations
• Admin APIs and SDKs
• User lifecycle management like SCIM
• MFA and policy enforcement
• Key rotation, token validation, audit logs

Examples of commonly used platforms include:

• Okta
• Auth0
• Microsoft Entra ID
• Ping Identity
• OneLogin
• Keycloak
• AWS Cognito
• FusionAuth

The “best” choice depends on whether you want managed SaaS or self-hosted/open source.

3) Evaluate reliability with these criteria

Security

• Strong support for PKCE, JWT validation, SAML assertions
• MFA options
• Tenant isolation
• Audit logs
• Secure secret/key management
• Support for signing cert rotation and metadata refresh

Operational maturity

• Public status page
• SLA and uptime history
• Incident transparency
• Support response times
• Backup/DR story
• Multi-region support if needed

Developer experience

• Good SDKs for your stack
• Clear docs for both SAML and OIDC
• Good error messages and logs
• Easy local/dev/test environment
• Sandbox or free tier for experimentation

Enterprise readiness

• SSO federation
• SCIM provisioning
• Group/role claims
• Attribute mapping
• Branding/custom login pages
• Org/tenant management

4) Test the hard parts early

Before committing, prototype:

• One OIDC login flow
• One SAML federation
• Logout behavior
• Token refresh and expiration
• MFA challenge flow
• Role/group mapping
• Account linking / JIT provisioning
• Certificate rotation
• Failure handling when IdP is down

These are common places where “supports SAML/OIDC” becomes “painful in production.”

5) Compare build vs buy

Buy a managed platform if:

• You want fast launch
• You need enterprise SSO quickly
• You don’t want to own auth security operations
• You need compliance and uptime guarantees

Build/self-host if:

• You need deep customization
• You have strong identity/security expertise
• You need to control data residency or hosting
• You want to avoid vendor lock-in
• You can support ongoing maintenance

6) Ask vendors the right questions

• Do you support both SAML 2.0 and OIDC natively?
• How do you handle metadata/cert rotation?
• Do you support SP-initiated and IdP-initiated SAML?
• What OIDC flows are supported? Authorization Code + PKCE?
• Can we map groups/roles/attributes from IdP?
• Do you support SCIM?
• What are your SLAs, incident history, and support tiers?
• How do you store and protect signing keys?
• Can we export data and migrate away later?
• What do logs/audit trails look like?

7) Shortlist based on your use case

A rough guide:

• Enterprise SaaS with lots of SSO: Okta, Entra ID, Ping, OneLogin
• Developer-first customer identity: Auth0, FusionAuth, Cognito
• Self-hosted/open source: Keycloak, FusionAuth (self-managed options)

8) Final selection checklist

Choose a platform that:

• Clearly supports your required protocols
• Has proven uptime and security practices
• Fits your app architecture
• Offers the integrations you need
• Has a migration path and avoids lock-in surprises
• Is easy for both developers and admins to operate

If you want, I can also help you build a vendor comparison matrix for your specific app or recommend platforms based on your stack and whether this is B2B, B2C, or internal enterprise.