Air Explorer vs Cyberduck

Air Explorer manages cloud storage accounts through one interface for transfers, synchronization and encryption. It can move files directly between cloud services without saving them locally; the home page says transfers have no data limits. Listed services include Google Drive, OneDrive, Dropbox, S3, SFTP, WebDAV and SharePoint. The desktop app supports scheduled synchronization and backups, including mirror and bidirectional modes. Files and filenames can be encrypted before upload, and the site says they are unreadable without the password. Its Android app handles cloud and device files, synchronization, encryption and access to computer files added as a cloud. Free BASIC costs nothing and limits users to one account per cloud, read-only cloud transfers and synchronization, plus two simultaneous downloads and two uploads. Pro starts at $21 a year for one device; a two-year plan is $31 a year, and a lifetime license is $42 as a one-time purchase. Supported platforms are Windows, macOS and Android.

Cyberduck is a libre server and cloud-storage browser for macOS and Windows. It connects to FTP, SFTP, WebDAV, SMB, OpenStack Swift, Google Cloud Storage, Amazon S3, Azure, Backblaze B2, OneDrive, SharePoint, Google Drive, Box, Dropbox, and other services. Transfers include drag-and-drop uploads and downloads, recursive directory transfers, resumable transfers, and direct copying between servers. It can synchronize local and remote directories and preview the files affected before acting. Users can edit server-side text or binary files with an external editor, and copy or open HTTP URLs; S3 support includes CDN and pre-signed URLs. Cryptomator integration provides client-side encryption, including encrypted filenames and files. SFTP supports strong ciphers, public-key authentication, and two-factor authentication. Passwords are kept in the system Keychain, and certificates are checked against its trust settings. The free software is GPL-licensed and does not require registration or an account. A personal registration key is listed at $10 a month, billed as a minimum contribution shown by the vendor; a separate registration key contribution is $10, paid once. Retaining modification dates is not supported for all protocols.