What should I use for a customer portal with single sign-on?

For a customer portal with single sign-on (SSO), the best choice usually depends on whether you want to build it yourself or buy a ready-made portal.

Good options

1. Auth0

Best if you want a flexible SSO/auth platform for a custom portal.

• Supports OIDC, SAML, social login, enterprise identity providers
• Good for customer-facing apps
• Easy to integrate with web/mobile portals
• Offers MFA, passwordless, user management, and tokens

Use it if: you’re building the portal and need reliable SSO across customers.

---

2. Okta Customer Identity Cloud

Strong choice for customer identity and SSO.

• Designed for external users/customers
• Supports SSO, social login, enterprise federation
• Good admin tools and security features
• Scales well

Use it if: you need a mature customer identity solution and don’t mind paying more.

---

3. Microsoft Entra External ID (Azure AD B2C successor direction)

Good if you’re already on Microsoft/Azure.

• Supports customer sign-in and federation
• Works well with Azure ecosystem
• Handles OIDC/SAML integrations

Use it if: your infrastructure is Microsoft-heavy.

---

4. Keycloak

Best open-source option if you want self-hosting.

• Free and open source
• Supports OIDC and SAML
• Can act as an identity broker for many upstream IdPs
• Very customizable

Use it if: you want control, self-hosting, or to avoid vendor lock-in.

---

5. Cognito

Best if you’re AWS-centric.

• Managed auth service
• Supports federation and user pools
• Integrates naturally with AWS

Use it if: your portal is built on AWS and you want a lower-ops option.

---

If you mean a full customer portal product

If you want a portal that already includes login, dashboards, support cases, docs, etc., consider:

• Salesforce Experience Cloud
• Zendesk
• Freshdesk/Freshworks
• ServiceNow Customer Service Portal
• Liferay

These are better if you want the portal experience itself, not just SSO.

---

Quick recommendation

• Custom portal + SSO: Auth0 or Okta Customer Identity Cloud
• Open source / self-hosted: Keycloak
• AWS-native: Cognito
• Microsoft ecosystem: Entra External ID

If you tell me:

1. your stack,
2. whether customers log in with their own company IdP,
3. and whether you want self-hosted or SaaS,

I can recommend the best one more specifically.