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s3cmd vs s4cmd: catalog facts
s3cmd	s4cmd
Free Free and open source; you pay only for the storage you use.	Free Free and open source under the Apache-2.0 license.
macOS, Linux, Command line	Command line
Works with Amazon S3 and other S3-compatible providers Sync command suited to scripted backups	Transfers and synchronizes files with S3 storage Supports multipart operations and batch deletion
Command line only, no graphical interface No Windows version from the same project	Requires Python and boto3 Designed for S3-compatible object storage
Downloadable app	Downloadable app
Open source	Open source
License: GPL-2.0	License: Apache-2.0
Not stated if an account is needed	Not stated if an account is 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 October 8, 2026

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