Proton Sheets arrives — encrypted, privacy-first spreadsheets in Proton Workspace

Proton has expanded its Workspace suite with Proton Sheets, a new spreadsheet app built into Proton Drive. The editor supports real-time collaboration, CSV and XLS import, common formulas and access from desktop and mobile devices.

Privacy is the headline feature: Proton says Sheets uses end-to-end encryption by default and that user data will not be used to train AI models. That positions Proton Sheets as a paid, privacy-focused alternative to mainstream productivity tools.

Key features

• End-to-end encryption: Data is encrypted by default while stored and edited in Sheets.
• Collaboration: Real-time multi-user editing and permissions for viewers and editors.
• Compatibility: Import CSV and XLS files and use familiar spreadsheet formulas.
• Cross-device: Access and edit on desktop and mobile.
• Integration: Works inside Proton Drive alongside Docs, Mail and Proton’s other privacy services.

Why it matters

For individuals and teams handling sensitive data—budgets, personal records, HR spreadsheets—the promise of E2E encryption and a firm no-AI-training policy may be decisive. Proton targets users willing to pay for a Google-like suite without the tradeoff of data usage for services or AI model training.

That said, Proton Sheets is new and may not yet match the advanced features, macros, scripting or third-party integrations of mature platforms like Google Sheets or Microsoft Excel. Organizations will need to weigh privacy gains against potential workflow limitations and migration costs.

What to watch

• Feature parity: support for macros, pivot tables, scripting and large, complex spreadsheets.
• Performance: how Proton Sheets handles collaborative edits and large files in practice.
• Enterprise readiness: compliance certifications, admin controls and third-party integrations.

Try or learn more at Proton Drive and the Proton homepage: proton.me.

Discussion: Would you move sensitive spreadsheets to a provider that guarantees end-to-end encryption and a no-AI-training promise — even if it means giving up some advanced features? What features would you need to make the switch?