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What is SYNCDATE?

SYNCDATE keeps several calendars honest about when one person is busy. It is for anyone who holds a calendar at more than one organisation: a consultant with a calendar at every client, a fractional executive, an agency owner, or someone with a day job and a business on the side. Connect each account over OAuth: Google Calendar, Microsoft Outlook or Microsoft 365, iCloud, Fastmail, Nextcloud or any CalDAV server. Choose which calendars feed which, one way or both ways. From then on, a meeting booked at one company blocks the time at the others. Subscribed iCal feeds can be used as a read-only source. A copy says what you decide. By default a copy shows Busy and nothing else, except in a two-way sync between calendars you own, which keeps the real titles. You can write your own text for the title, description and location on every plan. The Plus plan adds if/otherwise rules that look at an event's length, start time, weekday or a guest's email domain. The Pro plan lets each calendar in one sync follow its own rule. Google and Outlook changes usually reach the other calendar in under a minute. CalDAV calendars are checked about every 15 minutes. Every run shows on the dashboard. Delete a sync and it can remove every copy it made. Hosted in the EU, with a data processing agreement on every plan. The free plan holds two calendars across two accounts with no card and no time limit. Plus and Pro add accounts, calendars, range and rules, with a 7-day trial. Team gives every seat the Pro plan on one invoice; the administrator sees plan status and sync health, never anyone's events. Hosted in the EU. The same account can be used from an AI assistant over MCP.

What is Proton Calendar?

Proton Calendar acts as a detailed log of your daily activities while placing a high emphasis on your privacy. It provides automatic end-to-end encryption to keep all of your scheduled events secure. Moreover, events that are shared by users of different calendars benefit from zero-knowledge encryption, ensuring that sensitive information like titles, descriptions, locations, and guest lists remain private, protecting it from even Proton itself. This unique service enables you to manage your appointments effectively while also preserving your personal data. Created by the team behind Proton Mail, the world's largest encrypted email service, Proton Calendar has garnered a user base of over 50 million, which includes various well-known organizations. Furthermore, this calendar comes with a Proton Mail address, allowing you to send secure invitations for events, which significantly boosts your organizational abilities. You can also quickly add new appointments to your calendar straight from your Proton Mail inbox, making the process of scheduling even more efficient and user-friendly. With its innovative features, Proton Calendar not only helps you stay organized but also reinforces the importance of data privacy in our digital age.

Media

Media

Integrations Supported

Fastmail
Google Calendar
Microsoft 365
Microsoft Outlook
Nextcloud
iCloud

Integrations Supported

Proton Mail

API Availability

API Availability

Pricing Information

Free
Free plan; Plus $11.99 per month; Pro $21.99 per month; Team from $19.99 per seat per month, 5 seats minimum, lower with seat volume. Prices include tax.
Free Version
Free Trial Offered?

Pricing Information

Free
Free Version

Supported Platforms

SaaS

Supported Platforms

SaaS
Android

Customer Service / Support

Web-Based Support

Customer Service / Support

Web-Based Support

Training Options

Documentation Hub

Training Options

Documentation Hub

Company Facts

Organization Name

DUMA DIGITAL SOLUTIONS S.R.L.

Date Founded

2026

Company Location

Bucharest, Romania

Company Website

syncdate.app

Company Facts

Organization Name

Proton AG

Date Founded

2014

Company Location

Switzerland

Company Website

proton.me/calendar

Categories and Features

Calendar

Calendar Sync

Categories and Features

Calendar

Not specified

Productivity

Not specified

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