HashiCorp Vault is a source-available secret management tool designed for handling multiple backends, providing secure secret storage, and controlling access to secrets in dynamic environments. It offers advanced features like automated secret rotation and granular access controls but may be too expensive for most developers' needs. GCP Secret Manager, on the other hand, is a native solution that integrates well with the GCP ecosystem, offering capabilities such as secret versioning and granular access controls, but its limitations in these areas make it less suitable for complex environments. Infisical provides both cloud-managed and self-hosted options, featuring automatic rotation templates, stringent access control mechanisms, and wide range of infrastructure integrations, making it a robust infrastructure security platform that significantly enhances security posture and operational efficiency. When choosing between these solutions, the key factors include platform, pricing, integrations, user experience, security, compliance, and support needs.