Mountain Duck

Mountain Duck — mount cloud & servers as a Mac disk

Mountain Duck turns remote storage into a local volume in Finder: open files with any app, drag and drop to upload, and work the way you would on a built-in drive—without running a full sync client that mirrors everything.

Built on the same foundations as the open-source Cyberduck project, it speaks the protocols teams actually use in production—so you are not limited to a single vendor’s cloud app.

How it fits your workflow

Finder-first transfers: Copy and move items to remote targets using familiar macOS workflows—fast paths for day-to-day file ops.

Smart sync & offline choices: Pin folders you want available offline; other content can stay in the cloud and cache on demand, so it does not permanently consume local disk until you need it. When you open material, it can sync down for use; when connectivity returns, changes can propagate in the background (behavior depends on connection and settings).

Client-side encryption: Where you use compatible Cryptomator vaults, data at rest can be protected from unauthorized access independent of the hosting provider’s policies—defense in depth for sensitive trees.

Protocols, details & updates

Expect broad compatibility: FTP, SFTP, WebDAV, Azure Blob/Files-style access, Amazon S3, Google Cloud Storage, Google Drive, Dropbox, Backblaze B2, OpenStack Swift, and more—enough to cover most corporate and creative stacks.

• Version: 5.2.1
• Developer / product: David Kocher (Mountain Duck; related to the Cyberduck ecosystem)
• Interface languages: English, Russian, German, and 40+ additional localizations (Arabic, Japanese, Simplified/Traditional Chinese, and many European languages—see the installer for the full list)
• Compatibility: macOS 13 or later
• Architecture: Apple silicon (ARM) and Intel (x86-64)

Release history and fixes: Mountain Duck changelog

Download and licensing: use the official Mountain Duck / vendor site.