All three do zero-knowledge, end-to-end encrypted storage — the provider can't read your files. The differences are ecosystem, jurisdiction and price per gigabyte.
| Free | Paid (personal) | Jurisdiction | |
|---|---|---|---|
| Sync.com | 5 GB | ~$8/mo for 2 TB (Solo Pro); Teams from ~$6/user | Canada |
| Proton Drive | 2–5 GB | Drive Plus ~$5/mo (200 GB); Proton Unlimited ~$13/mo (500 GB + all Proton apps); 2 TB ~$15/mo | Switzerland |
| Tresorit | 3 GB | from ~$12/mo (higher per GB); business-focused | Switzerland / EU |
Sync.com undercuts the other two on raw storage — around $8/month for 2 TB, cheaper still on annual — and it's the value pick if you just want a lot of encrypted space and don't need anything else. Canadian jurisdiction (outside the US, subject to PIPEDA). The apps are functional rather than polished.
Proton Drive makes the most sense as part of the Proton ecosystem. On its own, Drive Plus is ~$5/month for 200 GB. But Proton Unlimited at ~$13/month bundles Drive (500 GB) with Mail, VPN, Pass and Calendar — if you want a full privacy suite from one Swiss provider, that's the better deal than buying each piece. Swiss privacy law, open-source apps, audited.
Tresorit is the enterprise/compliance option — the most expensive per gigabyte, built around Swiss and EU data residency, SOC 2 Type II audits, granular sharing controls, admin policy enforcement and [Microsoft](/entry/slack-vs-microsoft-teams-the-head-to-head-priced-2026) 365 integration. Priced and designed for regulated industries and businesses, not individuals looking for cheap space.
Want the most encrypted storage for the money: Sync.com. Want a whole privacy ecosystem (mail, VPN, calendar, drive) from one vendor: Proton Unlimited. Business with compliance requirements: Tresorit.