Sync your calendars, keep your privacy - Very Good Calendar Sync

Product Introduction

1. Overview: Very Good Calendar Sync is a native macOS application that performs on-device, bidirectional synchronization between multiple calendar accounts. It operates as a local agent, integrating directly with Apple's Calendar.app framework to manage events across Google Calendar, Microsoft Outlook/Exchange, Apple iCloud, and CalDAV services.
2. Value: The primary benefit is enabling unified calendar management across personal and professional life without the privacy risks of cloud-based synchronization services. It eliminates double-bookings by ensuring all connected calendars reflect true, real-time availability.

Main Features

1. On-Device Processing & Zero-Data Policy: The application runs entirely locally on the user's Mac. No calendar data is transmitted to external servers, ensuring compliance with data protection regulations like GDPR and eliminating the risk of third-party data breaches.
2. Native macOS Integration & Credential Security: Leverages macOS's built-in Internet Accounts system. User credentials for Google, Microsoft, and other services are stored securely by the operating system's keychain, never shared with or entered into the app itself, removing the need for OAuth tokens on third-party platforms.
3. Advanced Synchronization Rules & Event Redaction: Users can create granular sync rules based on day of the week (e.g., weekdays only) and time ranges (e.g., 9 AM to 5 PM). The unique "Clone or Redact" feature allows sharing availability without details—events can be synced as full copies or as redacted, time-blocked entries where titles, descriptions, and locations remain private.

Problems Solved

1. Challenge: Professionals using multiple calendars (e.g., work Google Calendar, personal iCloud) face constant manual cross-checking, leading to double-bookings, missed meetings, and the privacy dilemma of linking accounts to cloud-based sync tools.
2. Audience: This tool is essential for consultants, freelancers, product managers, and agency teams who manage separate client-facing and internal calendars, as well as any individual seeking a unified yet private view of their schedule.
3. Scenario: A freelance consultant can sync their agency's Microsoft Exchange calendar with their personal Google Calendar. Client meetings are cloned with full details to their personal calendar, while personal appointments are redacted to show only "Busy" on the work calendar, maintaining privacy and preventing conflicts.

Unique Advantages

1. Vs Competitors: Unlike cloud-based calendar sync services (e.g., Zapier, IFTTT, or dedicated sync apps), Very Good Calendar Sync requires no account linking on external websites, collects zero user data, and operates with lower latency as synchronization happens instantly on-device.
2. Innovation: Its technical edge is the deep integration with macOS's Calendar.app and Internet Accounts frameworks, allowing it to function as a privileged local client without acting as a middleman. This architecture is a novel approach to solving the multi-calendar problem while adhering to a strict privacy-by-design principle.

Frequently Asked Questions (FAQ)

1. How does Very Good Calendar Sync protect my privacy? The app runs locally on your Mac, using macOS's secure keychain for credentials. It never sends your calendar data to its own servers or any third party, ensuring all synchronization is private and on-device.
2. Which calendar services are supported? It supports any calendar service that syncs with macOS Calendar.app, including Google Calendar, Microsoft Outlook/Exchange, Apple iCloud, and standard CalDAV servers, with no additional configuration required.
3. Can I control what information is shared between calendars? Yes. The "Clone or Redact" feature lets you choose to sync full event details or create redacted "Busy" blocks, keeping sensitive information like meeting titles and locations private on selected calendars.