Microsoft cloud productivity suite. Direct CLOUD Act exposure.
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Ordered by feature parity and migration friction, which is weighted higher than feature breadth.
Figure 1Closest matches to Microsoft 365
Swiss zero-knowledge encrypted cloud (Proton AG, non-profit-foundation-controlled), 11,496 owned servers, ISO 27001 + SOC 2, 5 GB free.
German open-source content-collaboration platform (Nextcloud GmbH, Stuttgart, 2016); fully self-hostable + managed Nextcloud One hosted in DE.
Riga-based Latvian office suite (Ascensio System SIA), AGPLv3 self-hostable + DocSpace cloud; complex post-2023 Singapore+UK+Russian-origin ownership chain.
All 4 alternatives, benchmarked against Microsoft 365.
Swiss zero-knowledge encrypted cloud (Proton AG, non-profit-foundation-controlled), 11,496 owned servers, ISO 27001 + SOC 2, 5 GB free.
German open-source content-collaboration platform (Nextcloud GmbH, Stuttgart, 2016); fully self-hostable + managed Nextcloud One hosted in DE.
Riga-based Latvian office suite (Ascensio System SIA), AGPLv3 self-hostable + DocSpace cloud; complex post-2023 Singapore+UK+Russian-origin ownership chain.
Cambridge-based LibreOffice Online (MPL-2.0/LGPL) by Collabora Productivity Ltd: free CODE dev edition + €3/user/mo Business; self-hostable on EU infra.
Beyond compliance: how these alternatives compare on the capabilities you actually use day to day.
| Feature | Proton Drive | Nextcloud | OnlyOffice | Collabora Online |
|---|---|---|---|---|
| Free storage | 5 GB | Not assessed | Not assessed | Not assessed |
| Paid storage (from) | 200 GB | Not assessed | Not assessed | Not assessed |
| Max file size | Unlimited | Unlimited | Not assessed | Not assessed |
| Photo sync | Yes | Yes | Not assessed | Not assessed |
| File versioning | Yes | Yes | Not assessed | Not assessed |
| Link sharing | Yes | Yes | Not assessed | Not assessed |
| Self-hostable | Not assessed | Not assessed | Yes | Yes |
| Platforms | iOS macOS Windows Android Web | iOS macOS Windows Android Linux Web | Not assessed | Not assessed |
| Real-time collaboration | Not assessed | Not assessed | Yes | Yes |
| Databases / tables | Not assessed | Not assessed | No | No |
| Public publishing | Not assessed | Not assessed | Yes | Not assessed |
| Version history | Not assessed | Not assessed | Yes | Yes |
| Granular permissions | Not assessed | Not assessed | Yes | Not assessed |
| Offline mode | Not assessed | Not assessed | Yes | Yes |
| AI assist | Not assessed | Not assessed | Yes | Yes |
Source: vendor documentation, as of Aug 2026.
Listed for transparency. Every product on this page is benchmarked against this baseline.
Listed for transparency. Every product on this page is benchmarked against this baseline.
Microsoft cloud productivity suite. Direct CLOUD Act exposure.
For every product we read the public DPA, sub-processors document, hosting region declaration, and corporate ownership records. Each is timestamped. Signals are editorial, re-verified quarterly. We never accept self-attestation.
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