EnvKey (YC W18) is a smarter place to store API keys and credentials
techcrunch.com
techcrunch.com
Password managers can work for this, but they don't offer anything to help you manage multiple environments, conflict resolution, integration with code, etc. EnvKey tries to make all this seamless by zeroing in on this specific use case.
In comparison to Vault (which I think is great software and has helped to inspire EnvKey's design), EnvKey is just a lot simpler. There's no server management, and configuration of any development or server environment is as simple as setting a single environment variable (ENVKEY=F4U4jGkZuo24zKxxgJsR-4f1g2w3VpHYpYC2x).