Proton Mail
Sync.com
| Feature | Proton Mail | Sync.com |
|---|---|---|
| Pricing | Free / from $3.99/mo | Free / from $6/mo |
| Free Plan | ✓ Yes | ✓ Yes |
| Rating | 4.5 / 5 | 4.4 / 5 |
| Best For | privacy-conscious-users, journalists, activists, security-professionals | privacy-conscious-users, healthcare-professionals, lawyers, businesses-handling-sensitive-data |
| Founded | 2014 | 2011 |
| Encryption | ✓ | ✗ |
| Zero Access Architecture | ✓ | ✗ |
| Self Destructing Emails | ✓ | ✗ |
| Custom Domains | ✓ | ✗ |
| Bridge For Desktop | ✓ | ✗ |
| Calendar | ✓ | ✗ |
| End To End Encryption | ✗ | ✓ |
| File Sharing | ✗ | ✓ |
| Vault Storage | ✗ | ✓ |
| Document Scanning | ✗ | ✓ |
| Remote Wipe | ✗ | ✓ |
| Compliance | ✗ | ✓ |
✓ Proton Mail Pros
- End-to-end encryption
- No ads
- Swiss privacy laws
- Open source
✗ Proton Mail Cons
- Limited free storage
- Fewer integrations
- Search limited to metadata
✓ Sync.com Pros
- True zero-knowledge encryption
- GDPR and HIPAA compliant
- Generous free 5GB plan
- No third-party tracking
✗ Sync.com Cons
- Sync speeds slower than competitors
- Limited collaboration features
- No built-in document editing
The Verdict
Proton Mail is built for privacy conscious users and journalists, with a focus on encryption and zero-access-architecture. Sync.com targets privacy conscious users and healthcare professionals and leads with end-to-end-encryption and file-sharing.
Pricing is close: Proton Mail starts at $3.99/mo versus $6/mo for Sync.com — not a deciding factor on its own.
Both offer free plans, so you can test each with your real workflow before committing to a subscription.
Both tools are a solid fit for privacy conscious users — in those cases, the decision often comes down to workflow style and how your team prefers to organize work.
This is a genuinely close comparison. If you can, sign up for both free trials (where available) and run a one-week test with your actual team tasks before deciding.