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Proton Drive vs Sync.com: catalog facts
Proton Drive	Sync.com
Freemium A free account is available, with paid plans for more storage and a separate business…	Freemium A small free tier is available. More storage requires a paid plan.
Android, iOS, Web	Windows, macOS, Android, iOS, Web
End-to-end encryption that the provider cannot read Automatic photo and video backup from mobile	Zero-knowledge encryption applies to everything by default, not as an add-on Sharing links with passwords, expiry and download limits
Requires a Proton account Free tier storage is limited	No Linux client Zero-knowledge means a forgotten password can mean permanent data loss
Downloadable app, Web application, Hosted service	Downloadable app, Hosted service
Closed source	Closed source
License not stated	License not stated
Account needed	Account needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 22, 2026

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