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 Architecture Practice Partner
Partner in a 25-person architecture practice in Hamburg whose CAD and BIM models run to several gigabytes each, worked on from the office, from home and on the building site. Needs files on demand so laptops do not fill up, sync that sends only what changed, a drive letter the CAD software accepts, phones that open plans offline in a basement, and structural engineers who can pick up a folder without an account.
Proton Drive
Tresorit
This judge calls it a tie.
Criterion by criterion
Sync, clients & file access
Proton Drive
Windows and macOS desktop apps with a genuine on-demand mode — placeholders in File Explorer with thumbnails, pinning folders permanently offline, freeing space again, and offline edits that sync once reconnected — plus iOS, Android and web apps, automatic mobile photo backup, desktop uploads that resume after network interruptions, and transfers with no file size limits, which covers the site laptops and our multi-gigabyte models. We found no public information on block-level delta sync, access via WebDAV or a mounted drive letter the CAD software could use, Linux sync beyond a command-line tool, or file search in Drive.
Tresorit
Clients for Windows, macOS, Linux, iOS and Android with camera upload, offline and online access, a web interface, cloud files reachable from the local file manager, an S3-compatible API and stated per-plan file size limits of 15 GB and 20 GB cover the basics. For the parts that decide whether multi-gigabyte BIM models actually work day to day, we found no public information on files on demand, selective sync, delta sync for large files, previews or search.
Sharing & external collaboration
Proton Drive
Links with password and expiry, viewer and editor roles, email invitations, one-click revocation, download counting, and sharing that stays end-to-end encrypted — and recipients without an account can view, download, edit and upload to a shared folder, which is exactly what my structural engineers need. Real-time co-editing is documented for the vendor's own Docs editor, with.docx editing via Open in Docs. We found no public information on watermarking, download limits, file locking, comments, per-share access logs or an Outlook or Teams add-in.
Tresorit
Encrypted links with expiry, password, open limit, disabled downloads and dynamic watermarks, allowed-viewer and require-email controls, file requests for people without a Tresorit account — my structural engineers could pick up and hand back folders without ever registering — plus data rooms, comments, co-editing of Word, Excel and PowerPoint with the Collabora editor named, and free Outlook, Teams and Gmail plug-ins. Revocation that reaches copies already opened and recipient identity verification are only partially described, and we found no public information on file locking.
Encryption, key custody & recovery
Proton Drive
Client-side OpenPGP encryption covering contents and metadata, keys that never leave the device, open-source apps audited by Securitum with the reports published, a public bug bounty up to USD 100,000, SOC 2 Type II and ISO 27001, automatic versioning with rollback framed as ransomware recovery, ten years of version recovery on the paid plan, and SAML single sign-on plus organisation-level two-factor policy. The captured pages state plainly that data cannot be recovered if a password is misplaced, and we found no public information on key recovery for organisations or on the scope of the certifications.
Tresorit
Zero-knowledge, client-side AES-256 encryption is documented down to the RSA-4096 key scheme with a published whitepaper, the vendor states it cannot decrypt files or recover passwords, a Recovery Administrator can regain cryptographic access with user consent, two-factor authentication and SSO with Azure AD and Okta exist, previous versions and deleted files are restorable, and ISO 27001:2022 certification is stated. We found no public information on an independent audit, a penetration test or ransomware recovery, the length of version history is not stated, and folder names are not end-to-end encrypted.
Administration, audit & governance
Proton Drive
Three admin roles — Organization, User and Security Admin — with group-based role assignment, SAML and SCIM configuration, an activity monitor that admins can read and export, member management with per-user storage added or removed, and data retention settings are documented on the Professional and Workspace plans. We found no public information on external-sharing policies, legal hold, remote wipe or device management, SIEM streaming, retention length of the activity record, or company-owned team folders for Drive.
Tresorit
Azure AD provisioning via SSO and SCIM with Active Directory integration, exportable central audit logs of who accessed, shared or modified files, SIEM streaming to Microsoft Sentinel, approved devices, IP filtering and preconfigured policy templates at team and organization level, plus admin password reset and revoking lost devices — that is most of what I run a practice on. We found no public information on retention policies, legal hold, quotas or data loss prevention.
Export, API & self-hosting
Proton Drive
An import path from Dropbox is documented, documents export to.docx,.html,.txt,.md and.pdf, a command-line tool exists for Windows, macOS and Linux, and the data processing agreement says a copy of data must be requested before account deletion and that data is deleted when a service ceases. We found no public information on a documented REST API, SDKs or webhooks, open protocols such as WebDAV or S3 for migration, bulk export with folder structure and versions, or a self-hosted edition.
Tresorit
An S3-compatible API for automated transfers (Business Pro and Enterprise, content staying end-to-end encrypted), integrations with Microsoft 365, Outlook, Teams and Gmail, Bring Your Own Azure storage for encrypted content in our own storage account, and deleted folders said to be removed in encrypted form within 90 days give a real integration path. We found no public information on bulk export with folder structure, migration tools from named providers, SDKs, webhooks, an app marketplace or a self-hosted edition.
European sovereignty
Proton Drive
Proton AG in Plan-les-Ouates, Switzerland is the contracting entity, supervised by a Swiss non-profit foundation, with self-owned data centres in Switzerland and Germany, disclosure only to binding requests from competent Swiss authorities, a Luxembourg GDPR representative, a published data processing agreement, and ISO 27001 and SOC 2 stated. The privacy policy names each subprocessor with its location and transfer safeguards, but payment and support processors such as Stripe, PayPal and Zendesk process in the United States, so the chain is not European end to end.
Tresorit
The contracting entity is Tresorit AG of Zurich, part of Swiss Post, with an EU representative in Budapest; primary storage is stated as within the EEA or Switzerland, encrypted content can be pinned to a customer-selected EU or Swiss location, a data processing addendum and a subprocessor list are published, and ISO 27001:2022 is stated. The same pages say personal data may be transferred outside the EU or Switzerland, subprocessors may operate in the United States, and service data can be processed outside the chosen location, with no data centres named on the captured pages.
Pricing transparency
Proton Drive
Drive Professional is published at €9.99 €7.99 per month per user with 1 TB per user, consumer tiers carry exact totals such as €47.88 every 12 months for 200 GB, a free tier exists, and VAT reverse charge for business plans plus 30-day refund terms and monthly, yearly or bi-yearly cycles are stated. We found no public information on extra storage pricing, a minimum user count, or the price of the Enterprise tier, so I cannot compute a complete annual cost for the practice.
Tresorit
FileSharing Business is published at €12 / user / month from 3 users and Business Pro at €20 / user / month from 5 users, each with storage and file-size limits, a stated 20% yearly discount, fees stated as exclusive of taxes, and terms covering auto-renewal, refunds and price-change notice. Extra storage, the free tier's limits, the eSign add-on and Enterprise's custom pricing from 50 users are not priced on the captured pages.
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.