In today’s hectic and scattered world, without strong scheduling skills, you’re sunk. Forgetting to sync a calendar or adding something to the wrong to-do list could potentially have disastrous consequences. It doesn’t help that many of us have half a dozen different calendars or more.

Calendar APIs serve as vital links between applications and calendar apps like Google Calendar. Best of all, they automate everything, so your calendar is updated automatically rather than making one more thing to add to your stack of daily tasks.

Although the concept is incredibly simple, there can be profound differences in how calendar APIs are implemented. Some can check a user’s availability. Others will confirm that a particular room or resource is available at that particular time.

With that in mind, we’ve looked all over and compiled ten calendar APIs that will make your users’ work more efficient and productive and their lives significantly less stressful.

10 Calendar APIs Worth Checking Out

1. Nylas Calendar API

Nylas Calendar API is a powerful, customizable tool for integrating virtually anything with a calendar app. It lets developers build custom workflows as well as sleek UIs. Nylas even sends out automated event reminders, reducing the number of no-shows for appointments and reducing wasted time and miscommunications. It scales beautifully, too, so it’ll be there for you whether you have ten clients or ten million.

2. Google Calendar API

Of course, you can’t have a list of calendar APIs and not mention the official API of the most widely used calendar on the planet. Why bother with an intermediary when you can connect directly to the source?

Google Calendar API is one of the industry standards for a reason. It lets you create multiple calendars, for example, making Google Calendar API useful for organizations with many different teams or moving parts. It also offers excellent support for specifying who can access what, so it’s also good for data security. It also supports event objects, which can even be set to be recurring. Ongoing reminders are often a paid feature for scheduling apps, so Google Calendar API is worthy of investigation for that detail alone.

3. APIDeck Calendar API

Looking for a mix of a calendar integration API and a no-code connector tool like Zapier? APIDeck’s Calendar API is worth a look simply because it’s just one of the thousands of potential connectors and integrations the platform is capable of. Once you’ve integrated your apps with Google Calendar, you can take advantage of all of its native abilities, like creating events or setting reminders, for example.

Even better still, APIDeck has one of the more generous free tiers of the calendar APIs we’ve investigated, so you can really put it through its paces to see if it’s right for you and your workflow.

4. Cronofy Calendar API

Here’s another calendar API to rule them all. Cronofy Calendar API lets you integrate with your users’ calendar app no matter what they’re using. This makes it even more useful than connectors in some regards, as you won’t have to waste time digging around for the right converter or build unwieldy conversion chains. Even better still, this goes the other way around, as well. Your users will also be able to integrate with your calendar app, making things easier and more efficient for everybody across the board.

5. AddEvent Calendar API

Here’s a nice calendar API that integrates beautifully with your app, website, and marketing materials. AddEvent Calendar API. You can embed a simple, minimalist Add Event button on a website that automatically integrates with a user’s calendar app. It can also be embedded in marketing emails and materials, making it ideal for scheduling events through your email list or premium channels like Patreon or Discord Servers.

Like Google Calendar, AddEvent lets you create multiple calendars. Even better still, AddEvent API enables you to list all existing calendars via an API query. You can then return all existing events for that calendar via the API.

6. Zoho Calendar API

Zoho Calendar API is one of the most fully featured options on our calendar API roundup. It supports event creation and support for multiple calendars, like several others we’ve mentioned already, but that’s just the start. You can also group calendars together, letting you easily integrate each user’s calendars to help avoid miscommunications and oversights.

The platform’s Free/Busy API extends this functionality, as you can check a user’s availability for a particular time and date across all their calendars. The ability to easily share calendars via the Share API completes the package, making Zoho Calendar API one of the more useful scheduling APIs we’ve encountered.

7. Calendly Calendar API

Calendly Calendar API offers some of the same features as other scheduling APIs we’ve already discussed, but it’s more geared towards product development. It integrates easily with your calendar app and lets you automate steps in your project based on scheduled events.

Even better still, all of this scheduling data can be exported for analysis to further optimize your project management process. Add in other useful features like the ability to create single-use scheduling links and webhook subscriptions at the organizational level — and you’ve got a powerful and unique calendar API, indeed.

8. Cogwork

Of course, different industries are going to have different scheduling needs. The Cogswork calendar API is built specifically for the telemedicine industry. It’s got special features specifically pertinent to telemedical workers, like the ability to monitor working hours from staff, for example. It also checks for double bookings and overbookings so medical professionals don’t let their patients down or miss out on potential income.

You can even schedule team bookings and recurring appointments straight through the API. If you’re working in the digital healthcare field and need a scheduling solution, Cogwork’s for you.

9. Timekit

Timekit calendar API is a calendar API with some interesting twists. Like a few other calendar APIs we’ve already mentioned, Timekit will check a calendar for availability and free time. Where it stands out is a wide array of different scheduling options. You can book a time for a group, for example. Or you could block out a time to meet each member of a group individually.

You can get even more detailed than that. You can specify a certain amount of downtime before or after an appointment, for example, or the ability to determine the length of an appointment. These little details make Timekit one of the more useful calendar APIs on our list.

10. Cal.com Calendar API

Cal.com calendar API is a simple, straightforward API for syncing with your Google Calendar. Users receive their own endpoint via Cal.com, allowing you to then share your link so people can book appointments. Cal.com’s calendar API has a few other interesting features, as well, like the ability to specify what type of event you’re creating. You can even include other pertinent info like what kind of meeting it is, for instance, or how long it will last.

Best of all, Cal.com has a free tier for individuals, so if you’re working alone, you can get a powerful scheduling API entirely for free.

Final Thoughts On Calendar APIs

Life is busy, and for most of us, it’s only getting busier. To further complicate matters, barely anybody has just one job or duty any longer, so many of us are juggling more moving parts than ever before. Things are faster, more intense, and more competitive, which adds even more petrol to the open flame.

No matter who you are, you can’t afford to mess around with your scheduling. Having a good, reliable calendar API is one of the most essential building blocks of a good productivity workflow.