As of 1 Nov 2026, the panel rates Proton Drive 3/5 and Tresorit 3.5/5 in Cloud Storage & File Sharing. Weighted by what each judge cares about, 0 of the 6 judges pick Proton Drive and 5 pick Tresorit, 1 calls it a tie. Proton Drive scores higher on 3 of 7 criteria (European sovereignty, Encryption, key custody & recovery and Sync, clients & file access). Tresorit scores higher on 3 of 7 criteria (Sharing & external collaboration, Administration, audit & governance and Export, API & self-hosting). Provenance — Proton Drive: UK / wider Europe; Tresorit: UK / wider Europe. Ratings are the AI panel’s opinion, formed from public evidence: how scores are made.
Proton Drive holds the security bench: encryption and security averages 8.7 to 7.8, with five judges leaning its way and one tie, and sovereignty runs 8.0 to 7.0 on six leans — its verdict records a Swiss entity, self-owned data centres in Switzerland and Germany, and a published GDPR data processing agreement, with payment and support subprocessors such as Stripe and Zendesk processing in the United States under standard contractual clauses. Tresorit takes sharing and collaboration 8.8 to 5.8 and administration and governance 7.0 to 5.8 on six leans each, plus portability and integrations 4.8 to 4.0 on five leans with one tie. Sync and access, 5.8 to 5.7, and pricing transparency, level at 5.8, split one lean either way with four ties each. On weighted totals, five judges put Tresorit ahead; the architect scores both 6.1.
Choose Proton Drive if
You rank encryption and security first: five judges lean Proton Drive there, 8.7 to 7.8, and the verdict records contents, names and metadata encrypted on the device with keys never leaving it.
Your procurement wants a Swiss footing: the verdict records Proton AG contracted under Swiss law, self-owned data centres in Switzerland and Germany, and a published GDPR data processing agreement, and six judges lean Proton Drive on sovereignty, 8.0 to 7.0.
You need long recovery windows: the verdict records ten years of version recovery on paid plans.
You want code you can inspect: the verdict records open-source apps with published Securitum audits and a bug bounty reaching USD 100,000.
Choose Tresorit if
Your work runs through external sharing: six judges lean Tresorit on sharing and collaboration, 8.8 to 5.8, on encrypted links with password, expiry, disabled download and print, watermarks, and file requests for recipients without an account.
You administer a team: six judges lean Tresorit on administration and governance, 7.0 to 5.8.
You weight portability and integrations: five judges lean Tresorit there, 4.8 to 4.0, with one tie.
Your team edits documents in place: the verdict records zero-knowledge office editing on Collabora.
Read this comparison as one judge. Each weighs the same scores by what they care about.
The Tax Adviser
Runs a tax practice with eleven staff and 400 clients, bound by professional secrecy under §203 StGB. Receives receipts, payslips and annual accounts from clients who will not install anything, and sends back drafts that must not end up in a forwarded email. Needs upload links, shares with expiry and passwords, a record of who downloaded what, and a provider that cannot read the files it stores.
Proton Drive
Tresorit
This judge's pick
Criterion by criterion
Sync, clients & file access
Proton Drive
Windows and macOS apps with well-documented on-demand sync (online-only placeholders, always-keep-on-device, offline edits that resync), mobile apps with automatic photo backup, a web app and transfers without file size limits. We found no public information on full-text search inside documents, block-level sync, a Linux desktop client or access via WebDAV and similar open protocols, so this stays clearly below the top band.
Tresorit
Desktop clients for Windows, macOS and Linux plus iOS and Android apps with camera upload and secure document scanning, files reachable from the local file manager, offline and online access, and a stated ten-to-twenty-gigabyte cap per file cover a tax office's daily work. The captured pages show an S3-compatible API for automated transfers but say nothing about files on demand, delta sync, previews or full-text search.
Sharing & external collaboration
Proton Drive
Links with password and expiry, Viewer and Editor roles, instant revocation, and external people can upload into a shared folder without any account — exactly what my clients need — plus co-editing in the browser under the vendor's own Docs and Sheets editors. We found no public information on download limits, view-only links that block saving, watermarking, an Outlook add-in or a per-recipient access log; only an aggregate count of downloads is documented.
Tresorit
Encrypted file requests let clients hand over receipts without an account or any installation, links carry password, expiry, open limits, disabled download and print, dynamic watermarks and automatic deletion once revoked, and detailed access logs with link activity reports show who opened or downloaded what. The zero-knowledge model stays intact when sharing and even when editing Office files in the browser through the named editor Collabora, with free Outlook, Teams and Gmail plug-ins; recipient verification reaches only an allow-list plus a required email address, and we found no public information on file locking.
Encryption, key custody & recovery
Proton Drive
End-to-end encryption on all plans covers contents and metadata, stays on for sharing and collaborative editing, with OpenPGP and Curve25519 named, keys held on the device, a stated inability to decrypt or disclose, open-source apps, published Securitum audit reports, a public bug bounty and ISO 27001 plus SOC 2 Type II. The business risk is that a lost password makes data unrecoverable, and we found no public information on organisational key recovery; certification scope is also not detailed.
Tresorit
AES-256 client-side zero-knowledge encryption with the scheme published in an encryption whitepaper, passwords the provider cannot recover, a documented recovery-administrator mechanism with user consent, two-factor authentication and single sign-on, restore of previous versions and deleted files, and ISO 27001:2022 stated. Folder and room names are not end-to-end encrypted and may be visible to Tresorit during support, and the captured pages name no independent audit or penetration test, no certification scope, and nothing on ransomware detection or point-in-time restore of a whole account.
Administration, audit & governance
Proton Drive
Three admin roles with a documented rights matrix, SAML and SCIM single sign-on configuration, member and group management with storage allocation, account transfer, and an activity monitor that admins can read and export. We found no public information on device management or remote wipe, retention policies for stored files, legal hold, or forwarding logs to a SIEM.
Tresorit
A central admin console with exportable audit logs of who accessed, shared or modified files, provisioning through Azure AD with SCIM or Active Directory, IP filtering, approved devices and time restrictions, remote blocking of lost devices, policy templates at team and organisation level, and a Microsoft Sentinel SIEM integration cover most of what I must show an auditor. We found no public information on retention policies, legal hold, data loss prevention or transfer of a leaver's files.
Export, API & self-hosting
Proton Drive
A named import from Dropbox, document export to.docx,.html,.txt,.md and.pdf, a command-line tool on Windows, macOS and Linux, and contractual deletion of personal data when a service ends. We found no public information on a documented REST API, open-protocol access such as WebDAV for tool-independent migration, or a self-hosted edition.
Tresorit
An S3-compatible API on the Business Pro and Enterprise plans, integrations with Microsoft 365, Outlook and Teams, and Bring Your Own Azure terms letting encrypted content sit in the customer's own Azure storage account give a real exit path for the files themselves. The captured pages show no migration tool from a named provider, no stated bulk export with folder structure, no SDKs or webhooks and no self-hosted edition, and deletion is documented as within ninety days after a folder is deleted rather than on termination.
European sovereignty
Proton Drive
Proton AG in Geneva under the non-profit Proton Foundation stores files on its own hardware in Switzerland and Germany, Swiss law prohibits disclosure to foreign authorities, a GDPR data processing agreement with standard contractual clauses is published, the EU representative sits in Luxembourg, and certifications are stated. The subprocessor list is published with locations, but payment and support run through US providers such as Stripe, PayPal, Zendesk and Hubspot under contractual safeguards, so the chain is not wholly European.
Tresorit
Tresorit AG of Zurich, part of Swiss Post, under Swiss governing law with an EU representative in Budapest, storing personal data primarily in the EEA or Switzerland, with customer-selectable residency per user, a published sub-processor list, a data processing addendum and ISO 27001:2022 — the right neighbourhood for a practice under professional secrecy. It stops short of full proof: personal data may also be transferred outside the EU or Switzerland, sub-processors operate in the United States among other regions, some service metadata can be processed outside the chosen location, and no data centres are named on the captured pages.
Pricing transparency
Proton Drive
Drive Professional is public at "€9.99 €7.99/month" with 1 TB per user, consumer plans at €47.88 and €119.88 every 12 months with storage stated, a free tier with a three-editor-link limit, monthly to bi-yearly cycles, a 30-day refund and documented reverse-charge VAT for business plans. Extra storage, the enterprise tier and nonprofit discounts are handled by contacting sales, and we found no public information on a minimum number of seats.
Tresorit
FileSharing Business is stated at €12 / user / month from 3 users with 6 TB, Business Pro at €20 / user / month from at least 5 users with 15 TB, twenty percent off yearly billing, fees exclusive of taxes, and Enterprise from 50 users at custom pricing. The SecureCloud business plans carry no price on the captured pages, extra storage is unpriced, and residency and analytics features sit in higher tiers, so the real annual cost of a given setup is not computable from public pages alone.
Sovereignty, side by side
Dimension
Proton Drive
Tresorit
Legal entity
Not determined
Not determined
Hosting location
Not determined
Not determined
Hosting options
Not determined
Not determined
Open source
Not determined
Not determined
Data processing agreement
Not determined
Not determined
Transfer impact assessment
Not determined
Not determined
Facts, side by side
Only facts both products carry under the same definition — anything else would not be a fair row.
As of 1 Nov 2026, the panel rates Tresorit higher: 3.5/5 against 3/5. Weighted by what each judge cares about, 0 of the 6 judges pick Proton Drive and 5 pick Tresorit, 1 calls it a tie. Which one fits depends on the criteria that matter to you; the table on this page shows both side by side, and each judge’s reading has its own page. Both were scored by the same AI bench under the same rubric, from public evidence only, as the methodology describes.
Is Proton Drive or Tresorit European?
Proton Drive is European (UK / wider Europe). Tresorit is European (UK / wider Europe). Provenance is read from each company’s own legal pages: who builds it and who owns it.
Do Proton Drive and Tresorit have a free plan?
As of 1 Nov 2026, both vendors’ own pages state a free plan. Each product page links the pricing page it was read from.