Sync.com
File Storage · Free · since 2011
Visit Sync.com ↗ See alternatives Pricing
Sync.com is a privacy-focused cloud storage with zero-knowledge encryption and generous free tier. It handles zero knowledge, e2e encryption, file sync, and sharing, and it's best suited for users wanting zero-knowledge encrypted storage. It has been around since 2011, giving it a 15-year head start in building out integrations and refining the product.
The free plan offers 5 gb free. It's aimed at individual users, so it's fast to set up but may lack team-management features if you scale.
pros
- Includes Zero Knowledge as a core feature, purpose-built for file storage workflows
- End-to-end encryption by default — messages are unreadable even to the server operator
- 5 GB free — generous enough for most small teams to get real work done
- Established product with 15+ years on the market and a mature ecosystem
cons
- Free plan exists but key features are locked behind the paid upgrade
- Fewer built-in features means you may need additional tools to cover gaps
- Syncing large folders can be slow and occasionally causes file conflicts
- Limited team/admin features if your organization eventually scales up
top Sync.com alternatives
OneDrive Cloud storage tightly integrated with Microsoft 365, Windows, and Office apps. Free 
Box Enterprise cloud content management with advanced security, compliance, and workflow automation. Free 
pCloud Swiss-based cloud storage with lifetime plans, client-side encryption, and cross-platform sync. Free 
Tresorit End-to-end encrypted cloud storage for businesses and individuals who prioritize data security. $10.42/mo Sync.com compared
Dropbox vs Sync.com · Google Drive vs Sync.com · OneDrive vs Sync.com · Box vs Sync.com · pCloud vs Sync.com · Tresorit vs Sync.com · Sync.com vs MEGA · Sync.com vs Nextcloud
more file storage tools
Dropbox Cloud file storage and sharing platform with sync, collaboration, and productivity tools. Free 
Google Drive Cloud storage and file collaboration integrated with Google Workspace. Free OneDrive Cloud storage tightly integrated with Microsoft 365, Windows, and Office apps. Free Box Enterprise cloud content management with advanced security, compliance, and workflow automation. Free pCloud Swiss-based cloud storage with lifetime plans, client-side encryption, and cross-platform sync. Free Tresorit End-to-end encrypted cloud storage for businesses and individuals who prioritize data security. $10.42/mo