Keep your calendars in sync and never get overbooked anymore
Listing updated:July 17, 2025
Works with:
14K+
Overview
Create 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 Google™ (personals Gmail™ accounts or Google Workspace™ accounts)
- 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™, or Outlook.com?

We support Microsoft™ and Google™ 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
Sync Calendars will ask for the permissions shown below. Learn more
Sync Calendars will need access to your Google account
This will allow Sync Calendars 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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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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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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A User of Sync Calendars
January 13, 2025
Review of Sync Them Calendar App The Sync Them Calendar app is a game-changer for anyone juggling multiple schedules across personal, professional, and shared calendars. Designed with usability and efficiency in mind, it offers a seamless experience for staying organized and on top of commitments. Pros: Cross-Platform Syncing: Sync Them seamlessly integrates with popular calendar services like Google Calendar, Apple Calendar, and Outlook. Updates made on one device reflect instantly across all linked accounts, ensuring you're always in sync. Intuitive Interface: The app's clean and user-friendly design makes it easy to navigate. Whether you're scheduling meetings or setting reminders, the layout is clutter-free and quick to master. Smart Scheduling: One standout feature is its AI-powered scheduling assistant, which suggests optimal meeting times based on your availability and preferences. It even accounts for time zones when scheduling with international contacts. Color-Coded Events: The app allows you to categorize and color-code events, making it easier to differentiate between personal, work, and shared calendars at a glance. Collaboration Tools: Sync Them shines when it comes to collaboration. You can share calendars with family, friends, or colleagues and assign tasks or events. Changes are updated in real-time, which is a huge plus for teamwork. Custom Notifications: The notification system is robust, allowing you to customize alerts for each event. Whether you need a reminder hours in advance or just five minutes before, the app has you covered. Cons: Subscription Costs: While the app offers a free version, many of its best features—like advanced analytics and integration with third-party tools—are locked behind a premium subscription. Learning Curve for Advanced Features: While the basic functions are easy to grasp, some of the more advanced features (like automation rules or deep integrations) might require a bit of learning or trial and error. Battery Usage: The constant syncing and real-time updates can be a drain on battery life, especially for users with multiple accounts linked.
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Bobie Sue
February 17, 2025
I use Google Home and wanted to hear my schedule each morning, based on my work outlook calendar. The initial sync or maybe one of the refreshes I tried right away did duplicate some appointments, as others indicated. I cleaned those up and all was good.
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Cara
May 27, 2025
Super helpful! I was looking for a way to get my calendars synced without having to make my work calendar public to the organization. This did the trick!
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Juliette Brady
July 8, 2025
This has been such a gem of an app to use!!! It's integrated 2 of my google calendars + my outlook calendar so that each of them is always updated anytime I add anything to one of them. It's saved so much time and mental capacity!!
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Martin Glatz
June 6, 2025
I'm trying it right now, and so far it's working out pretty well.
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K Einstman
November 10, 2024
Happy to change my review if I can get some help. Your add-on seems good but a few things have gone wrong, and now some of my recurring events have disappeared from both calendars. · Synced work Calendar from Outlook to Google · Synced personal Calendar from Google to Outlook, set to display summary as "Appointment" Unsure why, but it created a loop where my Outlook meetings populated in Google, then repopulated in Outlook as "Appointments", changing the title/summary of all my meetings to "Appointment". Only the personal calendar events created on Google Calendar should have been renamed to "Appointment." Tried a few fixes, happened upon some other strange behavior (recurring meetings appearing on the wrong days of the week) and, finally, all of my recurring meetings have disappeared (even after uninstalling the add-on). I'm lost. I'm assuming the meetings aren't gone for good because they're shared events, but if they are gone for good, I'm gonna be real mad.
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Curt Bennett
June 12, 2025
I am liking it so far, I have to maintain an outlook calendar for work but i love using google calendar
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Nia Ladan Mowlid
May 5, 2025
This has been such a gem of an app to use!!! It's integrated 2 of my google calendars + my outlook calendar so that each of them is always updated anytime I add anything to one of them. It's saved so much time and mental capacity!!
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