SSO isn’t just for enterprises with deep pockets anymore. If you’re running multiple web apps and need a way to let users log in once and access everything seamlessly, you don’t have to reach for Auth0’s pricing tiers or lock yourself into a limited free plan. There’s a smarter, more cost-effective way to implement Single Sign-On (SSO)—and it doesn’t require rewriting your authentication system from scratch.
At Misar.IO, we’ve helped teams streamline authentication across multiple apps without breaking the bank. Whether you're managing a suite of internal tools, a set of customer-facing applications, or a growing ecosystem of microservices, SSO can reduce friction, improve security, and make user management far more manageable. The best part? You can get this done using open standards and a few well-chosen tools—no hidden costs, no vendor lock-in.
Here’s how to implement SSO across your web apps without paying for Auth0.
Use Open Standards: SAML, OIDC, and OAuth 2.0
The foundation of modern SSO isn’t proprietary—it’s built on open standards like SAML 2.0, OpenID Connect (OIDC), and OAuth 2.0. These protocols allow different applications to trust a single source of truth for authentication, regardless of who built the app or where it’s hosted.
Start by identifying your central identity provider (IdP). This could be a self-hosted solution like Keycloak, a cloud-based service like Cognito, or even a custom solution built on top of Django-allauth or NextAuth.js. The key is ensuring your IdP supports modern protocols. Most newer systems default to OIDC, which is easier to work with than SAML and more flexible than legacy solutions.
Once you’ve chosen your IdP, configure each of your web apps as service providers (SPs). Most web frameworks have libraries to handle SAML or OIDC flows. For example, if you’re using Node.js, passport-saml or openid-client can handle the heavy lifting. If you’re on Django, python3-saml or mozilla-django-oidc will get you most of the way.
The beauty of this approach is that once your IdP is set up correctly, adding new apps is just a matter of registering them as SPs. No need to touch user databases or password resets—users log in once, and every app trusts the IdP’s authentication.
Centralize User Management with an IdP
A common mistake teams make is treating each app as an independent authentication silo. That leads to password fatigue, inconsistent user experiences, and a maintenance nightmare. Instead, centralize user management with a single IdP.
The IdP becomes the source of truth for identities. You can create users in one place, assign roles or permissions, and enforce policies like multi-factor authentication (MFA) or password complexity. Apps don’t need to store user data or handle registration flows—they just need to trust the IdP’s assertion that a user is who they say they are.
Tools like Keycloak or Authelia (for self-hosted setups) give you full control over user management without the per-user pricing of commercial solutions. They support OIDC and SAML out of the box, and you can integrate them with LDAP, Active Directory, or even social logins like Google or GitHub.
If you’re using Misar.IO’s tooling, you can leverage its built-in OIDC support to simplify setup. For example, our platform helps streamline the configuration of trusted domains and callback URLs, reducing the time it takes to onboard a new service provider. This means less guesswork and fewer misconfigurations.
One practical tip: Use role-based access control (RBAC) in your IdP. Assign roles to users (e.g., admin, editor, viewer) and map those roles to permissions in each app. This keeps authorization logic consistent and makes scaling easier as your user base grows.
Automate and Scale with API-Driven User Provisioning
Manual user provisioning doesn’t scale. As you add more apps, syncing users across systems becomes error-prone and time-consuming. That’s where API-driven provisioning comes in.
Most modern IdPs support SCIM (System for Cross-domain Identity Management), a standard that lets you automate user creation, updates, and deactivation across apps. With SCIM, you can sync users from your HR system or user directory directly into your IdP, and then into all connected apps—without writing custom scripts.
For example, if you onboard a new employee, they’re added to your IdP via SCIM, which then propagates their account to every app in your ecosystem. When they leave, deactivating their account in one place removes access everywhere.
If your stack includes Misar.IO’s automation tools, you can trigger SCIM updates based on events (like a user signing up or being deactivated in your main CRM). This reduces operational overhead and ensures no one slips through the cracks.
Even without SCIM, you can use your IdP’s management API to automate user flows. For instance, you could build a script that creates users in Keycloak whenever they register on your marketing site, ensuring they’re ready to log in to all apps on day one.
Monitor, Secure, and Iterate
SSO isn’t a “set and forget” system. You need to monitor authentication events, detect anomalies, and respond quickly to potential breaches. Start by logging all login attempts, failed authentications, and token issuances. Use tools like Prometheus and Grafana to visualize trends and set up alerts for unusual activity.
Security doesn’t stop at monitoring. Enforce short-lived tokens, use refresh tokens wisely, and implement MFA at the IdP level. Avoid storing sensitive data in cookies or local storage—use HttpOnly and Secure flags, and prefer server-side sessions when possible.
If you’re using Misar.IO’s observability features, you can get real-time dashboards on authentication flows, failed logins, and token usage across all your apps. This visibility helps you catch issues before they become problems.
Finally, iterate based on feedback. Are users struggling with the login flow? Are certain apps more prone to errors? Use tools like Sentry or LogRocket to track user sessions and identify pain points. Adjust your IdP settings, app integrations, or documentation as needed.
Ready to stop paying for expensive SSO solutions and take control of your authentication stack? Start by picking an IdP that supports OIDC or SAML, centralize your user management, and automate provisioning with SCIM or APIs. With the right tools and a bit of upfront effort, you can implement SSO that scales with your business—without the per-user pricing or vendor lock-in.
At Misar.IO, we’ve seen teams cut their auth costs by 70% or more by moving away from solutions like Auth0 and building their own scalable systems. You can do the same.