Best Apereo CAS Alternatives in 2026
The top Apereo CAS alternatives are Keycloak, authentik and WSO2 Identity Server: 15 OAuth server software our editors would look at instead of Apereo CAS, in our ranking order.
Apereo CAS: A broad, auditable SSO foundation for teams prepared to run identity infrastructure. Where it falls short: self-hosted deployment requires internal infrastructure ownership.
Switching from Apereo CAS? For most oauth server software buyers the best Apereo CAS alternative is Keycloak, built for broad self-hosted identity deployments. On a budget, Amazon Cognito starts at $0.0055/user/mo.
Why People Look for an Apereo CAS Alternative
- Self-hosted deployment requires internal infrastructure ownership
- Its broad configuration surface may require specialist identity expertise
- Best suited to organizations able to manage a Java-based identity server
Quick Picks by What You Need
- Best overallKeycloak9.4
Broad self-hosted identity deployments
Visit Keycloak - Lowest priceAmazon Cognito8.7
Paid plans from $0.0055/user/mo
Visit Amazon Cognito - Best free optionKeycloak9.4
Has a free plan
Visit Keycloak
All 15 Apereo CAS Alternatives, Ranked
Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.
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Best forBroad self-hosted identity deployments
- Better than Apereo CAS:
- Editor score 9.4 vs 9.0
A broad, self-hosted IAM server for standards-based authentication and authorization.
9.4/10★★★★★Visit Keycloak -
Best forFeature-rich open-source identity teams
- Better than Apereo CAS:
- Editor score 9.2 vs 9.0
A broad, self-hosted identity stack for teams that need open-source control.
9.2/10★★★★★Visit authentik -
Best forEnterprise self-hosted IAM
- Better than Apereo CAS:
- Editor score 9.1 vs 9.0
A broad self-hosted IAM platform for enterprise OAuth, OIDC, SAML, and provisioning needs.
9.1/10★★★★★Visit WSO2 -
Best for.NET OAuth and OIDC implementations
A flexible .NET framework for building self-hosted OAuth and OIDC services.
- SAML support
- Self-hosting
- Token introspection
8.9/10★★★★☆Visit OpenIddict -
Best forManaged or self-hosted identity platforms
A flexible OAuth and identity stack for teams choosing cloud, self-hosting, or both.
8.8/10★★★★☆Visit Ory -
Best forAWS-centric application authentication
A usage-based AWS identity service with OAuth, federation, MFA, and temporary AWS credentials.
8.7/10★★★★☆Visit Amazon Cognito -
Best forFree self-hosted OAuth deployments
A free, self-hosted OAuth and identity platform with broad protocol support.
- SAML support
- Self-hosting
- Token introspection
8.6/10★★★★☆Visit Casdoor -
Best forLightweight Kubernetes OIDC federation
A focused, open-source OIDC and OAuth layer for Kubernetes federation.
- SAML support
- Self-hosting
- Token introspection
8.5/10★★★★☆Visit Dex -
Best forStandards-focused Node.js authorization servers
A configurable Node.js authorization server library for standards-focused teams.
- Self-hosting
- Token introspection
- Machine-to-machine auth
8.4/10★★★★☆Visit oidc-provider -
Best forSelf-hosted OAuth/OIDC with operational APIs
A self-hosted identity server with broad protocol support and operational APIs.
- SAML support
- Self-hosting
- Token introspection
8.3/10★★★★☆Visit Janssen Server -
Best forSelf-hosted reverse-proxy access control
A focused, self-hosted access layer for reverse-proxy environments.
8.2/10★★★★☆Visit Authelia -
Best forAdaptive open-source SSO gateways
A flexible self-hosted SSO gateway with broad protocols, adaptive access, and strong MFA coverage.
8.1/10★★★★☆Visit LemonLDAP::NG -
Best forTraditional self-hosted federation deployments
A broad, self-hosted federation server for organizations managing identity in-house.
- SAML support
- Self-hosting
- Token introspection
8.0/10★★★★☆Visit OpenAM -
Best forDeveloper-friendly hosted authentication
Developer-friendly hosted and self-hosted authentication with broad identity features.
7.9/10★★★★☆Visit Logto -
Best forMulti-tenant identity with provisioning
A flexible OAuth and multi-tenant identity platform with cloud and self-hosted options.
7.8/10★★★★☆Visit ZITADEL
Apereo CAS Alternatives: Common Questions
What is the best alternative to Apereo CAS?
Keycloak: #1 in our OAuth Server Software ranking, with an editor score of 9.4 out of 10. A broad, self-hosted IAM server for standards-based authentication and authorization.
Is there a free alternative to Apereo CAS?
Yes. Keycloak, authentik, WSO2 Identity Server, OpenIddict and Ory have a free plan or a free tier (15 of the 15 alternatives on this page).
What is the cheapest paid alternative to Apereo CAS?
Of the alternatives here that publish a price, Amazon Cognito starts lowest, at $0.0055/user/mo.
Why do people look for Apereo CAS alternatives?
Self-hosted deployment requires internal infrastructure ownership; Its broad configuration surface may require specialist identity expertise; Best suited to organizations able to manage a Java-based identity server.
How do I switch from Apereo CAS?
Snapshot or back up the data and configs on your Apereo CAS server. Create the new server with the same operating system and size, and add your SSH key. Copy the data across (rsync or your backup tool) and reinstall your apps or containers. Move the DNS records or IP references to the new server, test it, then cancel Apereo CAS.
How to Switch from Apereo CAS
- Snapshot or back up the data and configs on your Apereo CAS server.
- Create the new server with the same operating system and size, and add your SSH key.
- Copy the data across (rsync or your backup tool) and reinstall your apps or containers.
- Move the DNS records or IP references to the new server, test it, then cancel Apereo CAS.
Apereo CAS vs Each Alternative
| # | Tool | Free plan | Paid from | Deployment model | Score |
|---|---|---|---|---|---|
| 4 | Apereo CAS | Yes | Free | Self_hosted | 9.0 |
| 1 | Keycloak | Free | 9.4 | ||
| 2 | authentik | Yes | $5/user/mo | 9.2 | |
| 3 | WSO2 Identity Server | Yes | Free | 9.1 | |
| 4 | OpenIddict | Yes | Free | Self_hosted | 8.9 |
| 5 | Ory | Yes | 8.8 | ||
| 6 | Amazon Cognito | Yes | $0.0055/user/mo | 8.7 | |
| 7 | Casdoor | Yes | Free | Self_hosted | 8.6 |
| 8 | Dex | Free | Self_hosted | 8.5 | |
| 9 | oidc-provider | Free | Self_hosted | 8.4 | |
| 10 | Janssen Server | Free | Both | 8.3 | |
| 11 | Authelia | Yes | Free | 8.2 | |
| 12 | LemonLDAP::NG | Yes | Free | 8.1 | |
| 13 | OpenAM | Yes | Free | Self_hosted | 8.0 |
| 14 | Logto | Yes | $24/mo | Both | 7.9 |
| 15 | ZITADEL | Yes | $100/mo | 7.8 |
Head-to-Head
- Apereo CAS vs Keycloak
- Apereo CAS vs authentik
- Apereo CAS vs WSO2 Identity Server
- Apereo CAS vs OpenIddict
- Apereo CAS vs Ory
- Apereo CAS vs Amazon Cognito
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Last updated · How we research and update