Knox
Knox is a file encryption utility for macOS that lets users create, manage and back up encrypted disk images called vaults. Each vault is password-protected and can hold files of any size. Knox uses the macOS native encrypted disk image feature and the Advanced Encryption Standard (AES) with 256-bit or 128-bit key length to protect data. The app is used by professionals in healthcare, legal, finance and corporate environments to secure sensitive documents, source code, and business data. Vaults can be created on internal drives, external drives, and USB sticks, and can be opened and closed quickly from the menu bar or Dock.
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1 suggestionKnox has been discontinued and is no longer supported by the developer. The app has no native Apple Silicon build, and the Intel-only build will stop working entirely when Apple removes Rosetta 2 in macOS 28 (late 2027). If you currently rely on Knox vaults, you should plan to migrate your encrypted data to an alternative before that deadline. The good news is that Knox vaults are based on standard macOS encrypted disk images, so your existing vaults can continue to be opened and used even after Knox itself becomes unusable — macOS includes native support for mounting and working with these images without any third-party app. For new vault creation and ongoing management, consider built-in FileVault (which encrypts entire drives or partitions), or commercial alternatives like Cryptomator (free, open-source, cross-platform) or SilverKeep (native Apple Silicon support) which offer similar vault-based encryption workflows.
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