Top 5 Calendar Synchronization Apps in 2024

June 3rd, 2024

In the fast-paced world of IT professionals, engineers, and decision-makers, managing multiple calendars can be a daunting task. With meetings, deadlines, and personal commitments scattered across different platforms, the challenge is real. Have you ever missed an important meeting because it was on a calendar you forgot to check?

That's why I'd like to review with you the best calendar synchronization apps in 2024, designed to simplify your schedule and keep everything in order. From Google Calendar to Outlook, we'll dive into the best tools to help you stay organized and efficient without having to manually update your events.

Why Use a Calendar Synchronization Application?

Synchronization helps avoid conflicts and oversights. You might use Google Calendar for personal projects, Outlook for work, and iCloud for family events. A synchronization app consolidates all these events in one place, providing a clear overview of your schedule.

Without synchronization, you risk missing important meetings or scheduling duplicate events. These mistakes can lead to wasted time, frustration, and even missed opportunities. Furthermore, manual calendar management is tedious and prone to human error.

Synchronization applications automate this process, ensuring that every event is updated in real time on all your calendars. They also offer advanced features such as:

  • Customization of synchronization rules.

  • The ability to share scheduling links.

  • Enhanced security options.

In short, a calendar synchronization application is an indispensable tool for optimizing your time management, improving your productivity, and reducing the stress associated with managing multiple professional and personal commitments.

How to Choose the Best Calendar Synchronization App

Choosing the best calendar synchronization application depends on several key factors:

  1. Compatibility with your existing calendar platforms, such as Google Calendar, Outlook, or iCloud. My advice is simple: make sure the app supports all the platforms you use daily!

  2. Features offered: look for options like real-time synchronization, customization of synchronization rules, and the ability to share scheduling links. A good application should also offer an intuitive, easy-to-navigate user interface.

  3. Security: check whether the application uses robust security protocols such as OAuth2 and whether it guarantees that your data will not be stored or analyzed.

  4. Cost: compare different pricing options to find an application that offers the best value for money. Some apps offer free trials, which can be useful for testing features before making a financial commitment.

  5. External opinions: user reviews or recommendations from professionals in your field. Feedback can give you a clear idea of an application's reliability and effectiveness. You know the power of word of mouth! I invite you in particular to consult Capterra.

By taking these criteria into account, you'll be able to choose the calendar synchronization application best suited to your specific needs.

1 - CalendarBridge

CalendarBridge is a calendar synchronization application designed for professionals using multiple calendar platforms. It enables real-time synchronization of Google, Outlook, and iCloud calendars, ensuring that all your meetings, events, and appointments are always up-to-date on all your platforms.

Top 5 Calendar Synchronization Apps in 2024 CalendarBridge

Supported Applications and Main Features

CalendarBridge supports:

  • Google Calendar.

  • Calendars for Microsoft/Office 365 packages that include Exchange Online, Outlook (including,, and accounts).

  • iCloud.

Features include:

  • Real-time synchronization: events are updated instantly on Google and Outlook, and in 5 to 10 minutes on iCloud.

  • Scheduling capability with link sharing: allows others to plan meetings by checking your availability on multiple calendars.

  • Customizable synchronization rules: control which event details are synchronized, such as titles, descriptions, and participants.

  • Advanced security: the application uses OAuth2 to secure connections and does not store data.


For 4 calendar accounts connected from the same domain, you can choose between:

  • Basic license (2 synchronizations): $4 per month.

  • Premium license (16 synchronizations): $8 per month.

  • Pro license (36 synchronizations): $32 per month.

For 5 or more calendar accounts, you need a group account: starting at $3.20 per connection per month.

Advantages and Disadvantages


  • Supports multiple platforms.

  • Advanced customization of synchronization rules.

  • Intuitive user interface.

  • 14-day free trial.


  • Does not support Microsoft 365 Personal and Microsoft 365 Family accounts, nor local calendars in the Outlook desktop application.

  • Real-time synchronization is not immediate on iCloud: 5 to 10 minutes are required.

  • Diverse licenses and pricing make the offer difficult to understand. The offer is designed both according to the number of calendars and the number of synchronizations you need.

  • Prices climb very quickly as soon as you need more than 2 synchronizations.

  • Mastering the tool can be a little tricky at first.

Now, let me introduce you to a similar tool, OneCal.

2 - OneCal

Like CalendarBridge, OneCal is a calendar synchronization application designed to simplify the management of multiple calendars in real time.

Top 5 Calendar Synchronization Apps in 2024 OneCal

Supported Applications and Key Features

OneCal supports Outlook as well as Google Calendar. In terms of features, it offers:

  • Real-time synchronization.

  • The ability to synchronize multiple calendars in different directions.

  • Customization: you choose the elements to be synchronized, such as titles, descriptions, and participants.

  • Scheduling links: share links to allow others to schedule meetings by checking your availability.

  • Secure OAuth connections.


Various pricing plans are available, including options for individual and corporate users, with a free 14-day trial period:

  • Starter: 2 calendars for $4 per month

  • Essential: 5 calendars for $8.3 per month

  • Premium: 50 calendars for $25 per month

Advantages and Disadvantages


  • Easy-to-understand pricing offer.

  • Flexible customization options.

  • 14-day free trial.


  • Can be costly for users needing to synchronize multiple calendars.

  • High learning curve if unfamiliar with this type of tool.

  • Limited to Google Calendar and Outlook platforms.

OneCal and CalendarBridge are ideal for professionals looking for a robust, customizable solution to efficiently manage their various calendars, simplifying synchronization and improving time management.

Now, let's discuss a tool with features that go beyond calendar synchronization.

3 -

This tool is different from CalendarBridge or OneCal: it offers calendar synchronization, but also other options. Indeed, it uses AI to automate and manage your daily tasks.

Top 5 Calendar Synchronization Apps in 2024

Supported Applications and Main Features only supports Google Calendar. Here's what offers:

  • Real-time synchronization of Google Calendar calendars.

  • Intelligent scheduling: automation of recurring tasks, 1:1 meeting scheduling, habit management, and automatic addition of flexible breaks to avoid meeting overload

  • Integration with project management tools like Todoist, Asana, and Jira to schedule tasks directly in your calendar.

  • Creation of scheduling links.

Rates offers 3 paid subscriptions:

  • Starter for small teams (up to 10 seats): $8 per month.

  • Business for large teams (up to 100 seats): $8 per month.

  • Enterprise for enterprise-grade support (over 100 seats): $8 per month.

Advantages and Disadvantages


  • All intelligent scheduling features.

  • Integration with numerous productivity tools.

  • User-friendly, easy-to-navigate interface.

  • Free for a single user, with reduced functionality.


  • Currently limited to Google Calendar.

  • Learning curve can be high for users unfamiliar with task management tools.

  • Inevitably more expensive than a tool whose core functionality is calendar synchronization. The price includes AI functionality. is ideal for professionals who not only want to synchronize their calendars but also optimize their time and automate their daily tasks for more efficient management. It's a versatile tool for advanced users, but its use is limited to Google Calendar accounts.

4 - Google Sync

Google Sync is a native solution for synchronizing Google Calendar with other calendars and devices. It keeps your events and appointments up-to-date on all your Google-connected devices. In other words, it's synchronization within the same account.

Google tools

Main Features

Main features include:

  • Automatic multi-device synchronization: events are updated in real-time on all connected devices. With Microsoft Exchange ActiveSync 12.1, when you make a change on one device, it's automatically carried over to all other devices connected to your Google Account. This includes changes to appointments or events, as well as new invitations or cancellations.

  • Integration with Google Workspace: seamless synchronization with Gmail, Google Contacts, and other Google services.

Advantages and Disadvantages


  • Integrated solution for Google users.

  • No additional software installation required.

  • Free of charge.


  • Limited to Google products and services.

  • Very limited functionality for synchronizing multiple calendars.

  • Recognized security problem by Google: This is an old issue. While Google Sync is convenient for users, it poses challenges for IT teams. Companies using cloud applications to store sensitive data must provide credentials that are synchronized with Google's cloud. This includes storing personally identifiable information entered via autofill. If Google's server is compromised, this critical data could be exposed. To counter this risk, some IT teams have opted to disable Google Sync.

Moreover, Google Sync is not compatible with OAuth or two-factor authentication, nor with security keys, which considerably reduces data security.

Google is aware of this issue and has decreed that Google Sync will no longer be compatible with Google Workspace in autumn 2024.

In short, Google Sync is ideal for users looking for a simple, integrated solution for synchronizing their Google calendars with their devices, ensuring smooth, efficient schedule management, but it is insufficient for synchronizing different calendars with each other.

5 - Zapier

Zapier is an automation platform that enables you to synchronize calendar events by creating automated workflows, known as “Zaps”. Although mainly used for integrating various applications, Zapier also offers calendar synchronization between different platforms such as Google Calendar and Outlook.

Top 5 Calendar Synchronization Apps in 2024 Zapier

Supported Applications and Main Features

Zapier supports Google Calendar and Outlook. Key features include:

  • Customized workflow: create automations to synchronize events between different calendars.

  • Multi-application: integration with over 6,000 applications, including project management and communication tools.

  • Automated synchronization: configure triggers and actions to keep your calendars up-to-date.


Zapier offers 3 paid subscriptions:

  • Professional for individuals: $19.99 per month.

  • Team: $69.53 per month.

  • Enterprise: contact for pricing.

Advantages and Disadvantages


  • Highly flexible and customizable workflows.

  • Compatible with a wide range of applications.

  • Advanced security.

  • A versatile tool


  • A complex tool, with a high learning curve for new users.

  • High prices.

Like, Zapier is ideal for professionals looking to automate their calendar synchronization and integrate this functionality with a wide range of applications for more efficient task management. However, if your goal is to find a simple application focused on synchronizing different calendars, Zapier can prove complex.

Let's sum it all up.

Comparison of Key Features

Comparing the key features of calendar synchronization applications helps you determine which one best meets your specific needs. Here's an overview of the main features of each application discussed:




Google Sync


Real-time synchronization

Yes, for Google and Outlook, 5-10 min for iCloud

Yes, for Google and Outlook

Yes, for Google

Yes, for all Google devices

Yes, via customized workflows


Customization of rules

Scheduling links





Google Security


Integration of tasks

✅ with Todoist, Asana, Jira


Individual and group plans

Individual and corporate plans

Free and paid plans


Free and paid plans

Ease of use

This table highlights the main features of each application, making it easy to choose the one best suited to your synchronization and calendar management needs.

As you can see, each of these tools has its strong points and is fundamentally effective. However, they all have one weak point: their ease of use.

If you're looking for a simple synchronization tool that excels in this functionality, let me tell you about SyncThemCalendars.

Easily Sync Your Google Calendars with SyncThemCalendars

SyncThemCalendars is a practical solution for easily synchronizing your Google calendars. This tool is designed to eliminate calendar conflicts and simplify your schedule management by centralizing all your calendar information in one place.

In the end, that's all we do, and we do it well.

If you're wondering “How do you know for whom a calendar synchronization application is useful?”, I've got the answer for you!

The main features of our application are:

  • Quick setup: in just a few clicks, you can synchronize your Google calendars effortlessly.

  • Customization: define specific rules to decide what information to synchronize (titles, descriptions, locations, etc.).

  • Automation: once configured, synchronization takes place automatically without the need for manual intervention.

  • Reliable real-time synchronization.


  • A simple, one-price offer to synchronize up to 5 calendars.

  • A free 14-day trial.

  • A responsive and accommodating team.

  • Satisfied customers with an overall rating of 4.5 / 5: “We have several gmail accounts with different clients and booking meetings used to be a chore- I either had to update everything on each calendar separately (time wasting) or risk being double booked. This software automated that for me in a way that was better than IFTT and Zapier."

  • Affordable price: $5 monthly or $48 annually.

  • Unrivalled ease of use : no technical knowledge is required: you set up a one-time, fully customizable synchronization upon registration in just 5 clicks; 2 minutes and you're done!

I'll be honest to the last line of this article. That's why I'll also point out the drawback of our application: it's limited to Google Calendar accounts, although our team is currently working on integrating other tools, such as Microsoft and Apple calendars.

SyncThemCalendars is an ideal solution for those who want to simplify their time management and avoid the hassle of calendar conflicts.


Efficient management of multiple calendars is essential for modern professionals. Calendar synchronization applications such as CalendarBridge, OneCal,, Google Sync, and Zapier offer robust solutions for avoiding calendar conflicts and optimizing time management. By understanding the key features and benefits of each application, you can choose the one that best meets your specific needs. To find out more about the tools available and other time management solutions, don't hesitate to contact our sales team.

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