Azure Key Vault is a cloud-based service from Microsoft Azure that securely stores and manages cryptographic keys, secrets, and certificates, offering robust access controls through Azure Active Directory and seamless integration within the Microsoft Azure ecosystem. HashiCorp Vault, on the other hand, is a source-available tool for secrets management, encryption as a service, and privileged access management, providing a centralized place to store and access secrets with dynamic secret storage and tightly controlled access. Both solutions offer scalability, performance, audit and compliance capabilities, user experience and ease of use, but differ in their approach, features, and suitability for different organizational needs. Infisical is an open-source alternative that provides a great developer experience, industry-tested by Fortune 500 corporations and international governments, with tight access controls, permissioning workflows, and comprehensive audit logging. Ultimately, the choice between Azure Key Vault, HashiCorp Vault, or Infisical depends on specific organizational needs, infrastructure, and personal preference.