Keep your calendars in sync and never get overbooked anymore
Listing updated:December 12, 2025
Works with:
18K+
Overview
reate a synchronization between calendars  with our award winning service :  2 minutes setup, safe and secure, and protects your privacy.

OUR USERS ARE   : 

Freelancers which have multiple calendars and don’t want to be overbooked
Professionals that want to combine their personal and professional availability, without sharing any details of their schedule with co-workers, employees or customers.


FEATURES : 
- Unlimited number of calendars from Google™ (personal Gmail™ accounts or Google Workspace™ accounts), Microsoft™ (Office 365™, Outlook.com), and Apple™ (iCloud™)
- Real time synchronization : Synchronization are immediately reflected in the synced calendar to prevent overbooking
- One way or 2 ways calendar synch : choose 
Control over event details : In the sync settings you can choose if you want to display, hide or even modify the description, summary, visibility, reminders (....) of the event.


FREQUENTLY ASKED QUESTIONS : 

- What does SyncThemCalendars exactly do?

Our service allows you to set up synchronization between calendars. The ability to sync calendars is currently missing in all the leading online calendar services like Google Calendar™. With our tool you can merge calendars and availability


- But why do I need to set up a sync between different calendars?

There may be many use cases for this functionality. Perhaps you're working with multiple clients that require you to use their calendar accounts - this makes it hard to align your availability across all different calendars. You may be an entrepreneur with several businesses and domains and need to convey your free/busy time across. Or maybe you just want to block time on your work calendar based on your private/personal calendar? We support all of these use cases and more.

- Do you work with all the calendar services, such as Google Calendar™, Office 365™, Outlook.com, or Apple Calendar™?

We support Microsoft™, Google™, and Apple™ calendars.

- What do you do with my data?

We won't use your data for other reasons but to copy events across your calendars
Additional information
PricingFree of charge trial
Developer
Privacy policy
Terms of service
SyncThemCalendars will ask for the permissions shown below. Learn more
SyncThemCalendars will need access to your Google account
This will allow SyncThemCalendars to :
Run as a Gmail add-on
Run as a Calendar add-on
View and edit events on all your calendars
See and download any calendar you can access using your Google Calendar
Connect to an external service
View your country, language, and timezone
See your primary Google Account email address
See your personal info, including any personal info you've made publicly available
Reviews
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Adrian Pryce
December 7, 2025
Seemless process; worked right out of the box with a few clicks and finally got this pesky Outlook - Gmail problem solved.
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Anton Burnette
July 31, 2025
I recently used this app, and I must say, it delivers on its promises flawlessly. From the moment I started using it, everything worked smoothly, and I couldn’t be happier with the results. It’s user-friendly and incredibly efficient, making tasks so much easier to manage. Overall, I am thoroughly impressed with its functionality and performance. I would definitely give it five stars without hesitation! Highly recommended!
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Kendall Walker
October 17, 2025
This app work flawlessly on the first try. I have been trying to figure out how to get my personal Gmail calendar synced to my Google Workspace calendar for months, without manually duplicating events. I'm also big on color-coding my calendar to visualize different types of events, and the tool lets you choose colors as the calendars are synced over. No more manual sync calendar work, and my VA is very happy now.
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Neicee Sweet
May 19, 2025
I absolutely love being able to sink my calendars so that I am not overbooking myself, as a stay at home mom, active member of my church and running two small businesses it sometimes gets very hectic keeping up with my own schedule and switching between calendars can be overwhelming this is a game changer!
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Kelly Maxson
December 1, 2025
Helped me keep all of my appointments in sync. It was very easy to install and worked great! I definitely recommend this app for anyone who has multiple calendars to shuffle.
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Rite To Be You
October 29, 2025
Super easy to set up. I am syncing a few accounts and the Basic plan will give me everything I need.
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Stephan Shere
July 3, 2025
Syncing looks to work perfectly. Took a few minutes but it's looking solid! The only issue I can see is our Gmail events don't seem to stay private when we move them to the Outlook calendar.
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Joshua
November 24, 2025
Easy to set up, intuitive
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Alicia Kwande
November 24, 2025
Easy setup, reduced the hassle of checking and double-checking all the calendars to avoid double-booking.
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Jaden Whittaker
August 21, 2025
Such an easy sync process so you do not get overbooked and crammed with your busy schedule
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