[1] Please follow the link to see a comparison table with Hashicorp Vault and AWS Parameter Store: https://schibsted.github.io/strongbox/
[2] One of the fundamental differences between BlackBox and Strongbox is that BlackBox is based on GPG, while Strongbox is based on AWS KMS for encryption. Also BlackBox stores secrets in VCS repositories, while Strongbox primarily use AWS DynamoDB (while files are also supported).