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s4cmd vs s3cmd: catalog facts
s4cmd	s3cmd
Free Free and open source under the Apache-2.0 license.	Free Free and open source; you pay only for the storage you use.
Command line	macOS, Linux, Command line
Transfers and synchronizes files with S3 storage Supports multipart operations and batch deletion	Works with Amazon S3 and other S3-compatible providers Sync command suited to scripted backups
Requires Python and boto3 Designed for S3-compatible object storage	Command line only, no graphical interface No Windows version from the same project
Downloadable app	Downloadable app
Open source	Open source
License: Apache-2.0	License: GPL-2.0
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Needs internet
Official website Full listing and sources Checked October 8, 2026	Official website Full listing and sources Checked September 24, 2026

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