Use case
Bring your own cloud. Keep your own keys.
Crystor doesn't sell storage. Your vault syncs as sealed, per-file encrypted data through the cloud account you already have: Dropbox, Google Drive, OneDrive, or iCloud. The provider stores it and cannot read it. Sync, like the vault itself, is free.
Encryption happens on your device, filenames included, and the vault format is open and published. Your files remain yours to move, back up, or walk away with.