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S3Drive vs Round Sync: catalog facts
S3Drive	Round Sync
Freemium Paid storage plans are offered, and the app can also be pointed at your own S3 or Rclone…	Free Free and open source under the GPL-3.0 licence.
Linux, Android, iOS, Web	Android
Client-side encryption compatible with Rclone Works with any S3 provider or self-hosted MinIO and Ceph	Works with most cloud providers supported by rclone Can serve files over FTP, HTTP, WebDAV or DLNA
Proprietary client Bringing your own storage means managing a separate provider account	Homepage is the developer's personal site with little documentation Setup assumes some familiarity with rclone remotes
Downloadable app, Web application, Hosted service	Downloadable app
Closed source	Open source
License: Proprietary	License: GPL-3.0
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 2, 2026

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