| Price from | Free | — |
| Free plan | Yes | — |
| Free trial | — | — |
| Open source | — | — |
| Web | Yes | Yes |
| Linux | — | Yes |
| API | Yes | Yes |
| Self-hosted | Yes | Yes |
| Plans published | 1 | 3 |
| Spec score · Authentication Software | 8.2 (#11) | 7.5 (#22) |
| Purpose | CAS is a multilingual single sign-on solution and open-source identity provider for web authentication and authorization. | Gluu Flex is a self-hosted software distribution for building highly available, multi-datacenter identity and access management infrastructure. |
| Support | Apereo staff do not provide technical project support but direct users to project communities and mailing lists, including CAS security, developer, and user lists. | The Gluu Flex contract includes guaranteed response times and consultative support through the support portal. |