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duck vs s3cmd: catalog facts
duck	s3cmd
Free Free to install through package managers or installers.	Free Free and open source; you pay only for the storage you use.
Windows, macOS, Linux, Command line	macOS, Linux, Command line
Supports FTP, SFTP, WebDAV, S3 and Swift from one tool Access to Cryptomator encrypted vaults	Works with Amazon S3 and other S3-compatible providers Sync command suited to scripted backups
Command line only; use Cyberduck for a graphical interface	Command line only, no graphical interface No Windows version from the same project
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: GPL-2.0
No account needed	Not stated if an account is needed
Not stated if it works offline	Needs internet
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked September 24, 2026

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