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 IT Lead
Runs IT with one colleague for a 180-person machine builder with three sites and a sales office in Poland. Is retiring the old file server and wants every account provisioned from Entra ID, team folders that stay with the company when someone leaves, an audit log they can hand to the auditor, a lost laptop wiped remotely, and a way back to the last clean state if ransomware ever encrypts a share.
Proton Drive
Tresorit
This judge's pick
Criterion by criterion
Sync, clients & file access
Proton Drive
Windows and macOS desktop apps with well-documented on-demand sync (cloud-only placeholders, permanently kept offline folders, edits made offline uploading once reconnected), iOS and Android apps with automatic photo backup, a web app, no file size limits and resumable large uploads. We found no public information on a Linux desktop client for Drive (only a command-line tool), block-level or delta sync, full-text search, previews, or access via WebDAV, SFTP or S3.
Tresorit
Clients for Windows, Mac and Linux plus iOS and Android with camera upload and document scanning cover my three sites, files appear in the local file manager, sync runs offline and online, and file-size caps are stated at 15 to 20 GB depending on plan. Before retiring the file server I would still want answers: we found no public information on block-level or delta sync, full-text search, or preview of common formats.
Sharing & external collaboration
Proton Drive
Share links and email invitations come with passwords, expiry dates, one-click revocation, viewer and editor roles, upload-into-folder by external recipients without an account, tracking of download counts, and real-time co-editing in the named editor Proton Docs. We found no public information on administrator link policies, download limits, view-only no-download mode, watermarking, guest accounts, file locking, comments, or an Outlook or Teams add-in.
Tresorit
Encrypted links with password, expiry, open limits, disabled download and print, dynamic watermarks, allowed-viewer and email-to-view checks, auto-deletion of shared files, file requests for people without an account, link activity reports and analytics — close to data-room level, with revocation immediately stopping previously authorised users from opening files. Office files edit in the app under end-to-end encryption with Collabora named as the editor and the Outlook, Teams and Gmail plug-ins are free; we found no public information on file locking or whether revocation reaches copies already downloaded.
Encryption, key custody & recovery
Proton Drive
Zero-knowledge end-to-end encryption is the default and covers file contents, names and metadata with keys that stay on the device, the OpenPGP and Curve25519 cryptography is published in open-source code, Securitum audits are published, a public bug bounty reaches USD 100,000, ISO 27001 and SOC 2 Type II are stated, and paid plans include ten years of version recovery with documented rollback as ransomware recovery. For a 180-person company two gaps keep it from the top: no organisational key recovery is documented — the terms state data cannot be recovered if a password is misplaced — and only per-file version rollback, not restore of a whole folder or account to a point in time.
Tresorit
Client-side AES-256 zero-knowledge encryption with the scheme published (RSA-4096, tree of symmetric keys, non-convergent cryptography, whitepaper), no password recovery by the vendor, organisation key recovery via Advanced Control and a consented Recovery Administrator, two-factor, SSO and ISO 27001:2022 — the captured pages give different pictures of metadata encryption, with the terms stating folder and room names are not end-to-end encrypted. My ransomware worry is unresolved: we found no public information on point-in-time restore of a folder or account, ransomware detection, or a published audit report of the cryptography.
Administration, audit & governance
Proton Drive
SAML and SCIM configuration appear in the admin role matrix, which is what I need to provision accounts from Entra ID, alongside three admin roles (Organization, User, Security), an exportable activity monitor, per-user storage add/remove, and data retention controls. We found no public information on remote wipe or device unlinking for a lost laptop, team folders owned by the company rather than the user, transfer of a leaver's files (only emails are documented as transferable), external-sharing policies, legal hold, IP restrictions or SIEM streaming.
Tresorit
Provisioning from Azure AD via SSO and SCIM, Active Directory synchronisation of accounts and folder memberships, an exportable central audit log of who accessed, shared or modified any file, Sentinel SIEM streaming, policy templates with IP filtering and approved devices, group-level policy profiles, co-admins, and blocking of lost or stolen devices — this maps almost one-to-one onto my list. Not found on the captured pages: retention policies and legal hold, data loss prevention or classification, and whether a lost device is wiped rather than only blocked.
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 automates workflows on Linux, macOS and Windows, and the data processing agreement states deletion of personal data when a service ceases, with copies to be requested before account deletion. We found no public information on a REST API with SDKs or webhooks, bulk export with folder structure, open-protocol (WebDAV, S3, SFTP) migration, an app marketplace, or a self-hosted edition.
Tresorit
An S3-compatible API (Business Pro and up, content stays end-to-end encrypted), Microsoft 365, Outlook, Teams and Sentinel integrations, and documented deletion of encrypted content within 90 days of folder deletion. For the file-server migration I am short: we found no public information on bulk export with the folder structure, migration tools from named providers, SDKs or webhooks, or a self-hosted edition; Bring Your Own Azure Storage is the only self-managed storage option evidenced.
European sovereignty
Proton Drive
Proton AG is the contracting entity under Swiss law with a Geneva address, files sit on self-owned hardware in data centres in Switzerland and Germany with biometric access, a GDPR data processing agreement is published with a Luxembourg EU representative, and transfers are limited to Switzerland, the EU and adequacy countries. The public subprocessor list names support and payment providers in the United States, United Kingdom, Taiwan and Macedonia, each with stated safeguards such as standard contractual clauses, so the chain is strongly European for the files but not European end to end.
Tresorit
Tresorit AG of Zurich under Swiss law, part of Swiss Post, primary storage in the EEA or Switzerland, a customer-selectable EU residency option, a published subprocessor list, a Data Processing Addendum and ISO 27001:2022 — a chain I could defend to our auditor. Caveats: residency only covers content uploaded after the customer selects the location, some service data and sub-processing can run in the United States and other countries, and we found no public information naming the data centres.
Pricing transparency
Proton Drive
Drive Professional is shown at "€9.99 €7.99/month" with 1 TB per user, Drive Plus at €47.88 every 12 months with 200 GB and ten-year version recovery, a free tier exists with a stated limit of three editor sharing links, business plans get reverse-charge VAT treatment, and there is a 30-day money-back guarantee with published refund limits. Extra storage, minimum seat counts and any enterprise tier are unpriced, and admin roles are documented only as available on Professional and higher, so I cannot compute a real 180-seat annual cost from the public pages alone.
Tresorit
The FileSharing tiers are public: €12 / user / month from 3 users with from 6 TB, Business Pro at €20 / user / month from 5 users with from 15 TB, 20% OFF yearly, 1 TB encrypted storage per user on the sharing plans, with minimum users, VAT treatment (fees exclusive of taxes) and renewal and refund rules stated in the terms. Gaps: we found no public price for extra storage, the eSign add-on or the SecureCloud plans, and Enterprise is custom pricing from 50 users.
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.