CypherKeep

CypherKeep is a native macOS secrets manager aimed at developers, crypto users and privacy-conscious professionals. It works entirely on your machine, with no cloud sync and no analytics, encrypting data with Apple's CryptoKit and storing keys in the system Keychain, so API keys, seed phrases and other sensitive strings never leave the device.

The local-only design is the reason to choose it and the main limit: there is no sync to your phone or a teammate, and backups are your responsibility. If you lose the Mac without a backup, the secrets go with it. Developers who keep tokens in plain text notes, and crypto holders who distrust cloud password managers, will find it a more disciplined home for them.