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FolderSync vs Zimly: S3 Backup: catalog facts
FolderSync	Zimly: S3 Backup
Freemium The Android app is free; the desktop app has a 14-day trial.	Free Free and open source under GPL-3.0-only.
Windows, macOS, Linux, Android	Android
Supports more than 20 cloud providers Also syncs with SMB and SFTP targets	Works with any S3-compatible storage Supports self-hosted MinIO and AWS S3
Desktop version is paid after a 14-day trial Proprietary software	Requires your own S3 storage and credentials Android only
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: GPL-3.0-only
Not stated if an account is needed	No account needed
Not stated if it works offline	Needs internet
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked October 2, 2026

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