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LFTP vs duck: catalog facts
LFTP	duck
Free Free software distributed under the GNU GPL.	Free Free to install through package managers or installers.
macOS, Linux, Command line	Windows, macOS, Linux, Command line
Built-in mirror command for syncing directory trees Parallel transfers and background jobs	Supports FTP, SFTP, WebDAV, S3 and Swift from one tool Access to Cryptomator encrypted vaults
Command line only, with no graphical interface Maintainer has limited time and releases are rare	Command line only; use Cyberduck for a graphical interface
Downloadable app	Downloadable app
Open source	Closed source
License: GPL	License not stated
No account needed	No account needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 24, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.