authentik is an open source Identity Provider that unifies customers' identity needs into a single platform, replacing Okta, Entra ID, and Keycloak. Many enterprise customers choose to add authentik to streamline their operations with a more flexible, reliable solution and a more responsive vendor. Common reasons for this choice include the need for flexibility in integrating directly with other services or APIs, avoiding security issues and lack of customer responsiveness from legacy providers like Okta, not wanting to share sensitive data due to compliance requirements, and needing resiliency and high availability even when critical systems are down. authentik provides a flexible, reliable solution with features such as API access, blueprint system for automating configurations, and expression policies for custom checks and validation, making it an attractive option for companies looking to replace traditional identity providers with a more modern approach.