First, thank you for your continued work on security, privacy, and open-source transparency. Proton has built incredible trust by consistently investing in external audits and making code available for inspection.

I’d like to propose a Unified Sync & Health Audit Tool to strengthen reliability across Proton services (Mail, Drive, Pass, Calendar, Authenticator, VPN and etc). While current audits cover security and privacy, there is no integrated way for users to verify that all Proton apps are syncing correctly, consistently, and without errors across devices.

Problem
• Users sometimes experience sync delays, failed uploads, or conflicts (especially with Drive and multi-device use).
• Currently, there’s no central dashboard or diagnostic tool to identify or resolve these issues.
• Errors may remain hidden until critical data is missing, undermining trust in reliability.

Proposed Solution: Sync Audit & Health Dashboard

A cross-service tool that provides:
1. Sync Status Dashboard – Show real-time sync state for each app, last sync time, and any pending/failed items.
2. Cross-Device Consistency Checks – Verify that data matches across all devices using integrity checks (hashes/checksums).
3. Error Logs & Diagnostics – User-friendly reporting of sync errors (e.g., network issues, quota exceeded, conflicts).
4. Performance Metrics – Provide basic insights on sync speeds and recovery from interruptions.
5. Optional Notifications – Alert users when sync fails or is significantly delayed.

Benefits
• Strengthens Proton’s core value of trust through transparency.
• Reduces support burden by giving users tools to self-diagnose issues.
• Improves user confidence in storing and syncing sensitive information with Proton.
• Differentiates Proton by coupling security audits with functional reliability audits.

This would not need to expose private content ... only metadata such as sync state, timestamps, and integrity checks ... preserving Proton’s privacy commitments.

Thank you for considering this feature. A unified sync health tool would greatly enhance the reliability and peace of mind for Proton’s global user base.