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S3Drive vs Koofr Vault: catalog facts
S3Drive	Koofr Vault
Freemium Paid storage plans are offered, and the app can also be pointed at your own S3 or Rclone…	Freemium Included in all Koofr plans, including the free plan.
Linux, Android, iOS, Web	Android, Web
Client-side encryption compatible with Rclone Works with any S3 provider or self-hosted MinIO and Ceph	Client-side, zero-knowledge encryption Included with the free Koofr plan
Proprietary client Bringing your own storage means managing a separate provider account	Requires a Koofr account Only works with Koofr storage
Downloadable app, Web application, Hosted service	Downloadable app, Web application
Closed source	Open source
License: Proprietary	License: MIT
Not stated if an account is needed	Account 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.