Proton Sheets Launched and Reviewed 2026

The wait is finally over. After months of anticipation, Proton Sheets has officially launched, completing the privacy-focused office suite that began with Proton Docs. This fully encrypted spreadsheet application promises to deliver the functionality of Google Sheets while maintaining the zero-knowledge encryption that Proton is known for. After extensive testing, here’s my complete analysis of this game-changing addition to the Proton ecosystem.

What is Proton Sheets?

Proton Sheets is the spreadsheet component of Proton Drive, developed by Swiss-based Proton AG. It addresses the critical gap identified in our earlier Proton Docs review where users needed proper spreadsheet functionality with calculations, formulas, and data analysis capabilities. Like all Proton products, Sheets features end-to-end encryption, ensuring your financial data, business calculations, and sensitive information remain completely private.

First impressions: familiar and powerful

Opening Proton Sheets for the first time feels remarkably familiar if you’ve used Google Sheets or Excel. The interface is clean and uncluttered, with a comprehensive toolbar featuring all essential spreadsheet functions. The grid layout is responsive, and cell navigation feels smooth and natural.

What immediately stands out is how Proton has managed to deliver a full-featured spreadsheet experience without compromising on encryption. Everything happens client-side, yet the performance remains impressively snappy.

Formulas and calculations: the real deal

This is where Proton Sheets truly shines and differentiates itself from the basic tables available in Proton Docs. The formula support is comprehensive, including:

• Mathematical functions (SUM, AVERAGE, COUNT, MIN, MAX)
• Logical operators (IF, AND, OR, NOT)
• Text manipulation functions
• Date and time calculations
• Financial functions for business calculations
• Lookup and reference functions

In my testing, formulas executed quickly and accurately. Cell references update dynamically when you move data around, and the formula bar provides helpful autocomplete suggestions as you type.

Data management: sorting, filtering, and validation

Proton Sheets includes robust data management features that were conspicuously absent from Proton Docs’ basic tables. The Data menu provides access to essential spreadsheet functionality including sheet sorting, filter removal, and data validation controls.

These features work exactly as you’d expect from a modern spreadsheet application. You can quickly sort columns alphabetically or numerically, apply filters to view specific subsets of your data, and set validation rules to ensure data integrity. For teams managing inventory lists, project trackers, or financial records, these capabilities are indispensable.

Collaboration and sharing

Like Proton Docs, Sheets offers straightforward collaboration features. You can share spreadsheets with specific people or create public links with customizable permissions – viewer, commenter, or editor access. The sharing dialog is intuitive, and you can see exactly who has access to your spreadsheet at any time.

What’s particularly noteworthy is that recipients don’t need a Proton account to view shared spreadsheets. For editing capabilities, a free Proton account suffices, removing barriers to collaboration while maintaining security.

Formatting and customization

Proton Sheets provides comprehensive formatting options including:

• Font styles, sizes, and colors
• Cell background colors and borders
• Number formatting (currency, percentages, dates)
• Text alignment and wrapping options
• Cell merging capabilities
• Column width and row height adjustments

These formatting tools are sufficient for creating professional-looking spreadsheets without overwhelming complexity.

Privacy and security: the core advantage

The defining feature of Proton Sheets is its uncompromising approach to privacy. Every spreadsheet is protected by end-to-end encryption, meaning:

• Proton employees cannot access your data
• Your financial information remains completely private
• No data mining for advertising purposes
• No AI training on your sensitive business data
• Protection under Swiss privacy laws
• Zero-knowledge architecture ensures total confidentiality

For businesses handling sensitive financial data, personal budgets, confidential client information, or proprietary calculations, this level of privacy is invaluable.

Performance and reliability

Despite the computational overhead of client-side encryption, Proton Sheets performs admirably. Spreadsheets load quickly, formulas calculate without noticeable delay, and even moderately large datasets remain responsive. The autosave functionality works reliably in the background, ensuring you never lose work.

Cross-device synchronization is seamless – changes made on desktop appear instantly on mobile devices and vice versa.

Current limitations

While Proton Sheets is remarkably capable, there are some limitations compared to more established platforms:

• Limited chart and visualization options
• No macro or scripting support
• Fewer advanced functions compared to Excel
• No pivot table functionality yet
• Limited template library
• No third-party integrations or add-ons

However, for the vast majority of users and use cases, Proton Sheets provides everything needed for daily spreadsheet work.

How Proton Sheets complements Proton Docs

The launch of Proton Sheets addresses the most significant limitation we identified in our earlier review of Proton Docs. While Proton Docs excels at text documents and basic tables, it couldn’t handle the computational requirements of real spreadsheet work.

Now, users have access to a complete, privacy-focused office suite. You can draft proposals in Proton Docs, maintain budgets in Proton Sheets, and collaborate on both – all with complete confidence in your data privacy.

Pricing and availability

Proton Sheets is included with all Proton Drive plans, including the free tier. This means you can start using encrypted spreadsheets immediately without any financial commitment. Paid plans offer additional storage and advanced features for power users and teams.

Final verdict: privacy meets productivity

Proton Sheets represents a significant milestone in privacy-focused productivity tools. It successfully delivers the spreadsheet functionality users need while maintaining Proton’s unwavering commitment to encryption and privacy.

For individuals and businesses concerned about data privacy, Proton Sheets offers a compelling alternative to Google Sheets and Microsoft Excel Online. While it may not match every advanced feature of these established platforms, it provides more than enough functionality for typical spreadsheet needs – budgets, tracking systems, data analysis, and financial planning.

The combination of Proton Docs and Proton Sheets creates a privacy-respecting office suite that genuinely competes with mainstream alternatives. Together, they prove that you don’t have to sacrifice your privacy to maintain productivity.

Strengths:

• Complete end-to-end encryption for all data
• Comprehensive formula and function support
• Robust data sorting and filtering capabilities
• Intuitive interface familiar to spreadsheet users
• Seamless collaboration and sharing features
• No account required for viewing shared sheets
• Reliable performance despite encryption overhead
• Swiss privacy law protection
• Available on free tier

Weaknesses:

• Limited charting and visualization options
• No pivot tables yet
• Missing advanced Excel-equivalent functions
• No macro or automation support
• Limited template selection

For anyone seeking a privacy-respecting alternative to Google Sheets, Proton Sheets is an outstanding choice. Combined with Proton Docs, it creates a complete office suite where privacy and productivity coexist seamlessly. This represents the future of digital work – powerful, collaborative, and genuinely private.

Last Updated on 5 December 2025