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