Availability API

Real-time bookings when everyone is available

The Cronofy Availability API helps you find – in real-time – the best time slots for your users to get together

Lloyd Price

“Real time booking is at the heart of what we do at Zesty. Cronofy has allowed us to deliver that rapidly and reliably.”

— Lloyd Price, COO, Zesty

Automatic real-time scheduling

Missed appointments, double-bookings, and the cost of co-ordinating attendees costs time and money. The more people that are involved, the more difficult it gets.

You can build real-time scheduling features into your application with our Availability API.

It checks the real-time availability of attendees for your users so that they only schedule appointments that everyone can attend.

Find a time that works for everyone, no rescheduling required

Training sessions are vital to employees' development. But organizing them isn't easy. There are attendees, external trainers, the right-sized room, and any required equipment to factor in. Organizing all of this can easily equate to a whole afternoon lost for your users.

With the Availability API, it takes seconds.

It finds the best times for everyone to meet and factors in required rooms and resources at the same time.

No phone calls, no emails, just one call to the API.

Take a look at our API documentation

Handle complex scheduling instantly

More people in more meetings means more complexity and greater costs.

Take yearly appraisals. Hundreds of staff members need to meet with their line managers, but there are only a handful of meeting rooms available.

For most companies, this means weeks of scheduling for HR teams. When they use a software that can check the availability and book meetings in real-time, the whole process is automated.

The Availability API can tell you when every member of staff, their manager, and a meeting room are available.

Powering clients...

Find out more

Get free access to our calendar sandbox and start testing our calendar API.


How does Cronofy work?

Cronofy allows developers to build software that connects with multiple calendar services while working with just one API. This saves them time, saves businesses money, and makes the ongoing maintenance of building calendar connectivity easier for everyone.

Do I need to connect to different calendar services?

No, Cronofy supports applications that sit between the various calendar services and provides access to all or some of the five major calendar services that we connect to.

Do I need to enable each calendar service?

No. Cronofy’s APIs automatically give you access to the five calendar services.

What is required to integrate my application with Cronofy?

You set the rules and must provide the UI for your application. You need to integrate our authentication process and use our API to retrieve calendar data. Cronofy is responsible for ensuring the application receives the calendar data.

How do users connect to Cronofy?

Your user is directed to an authentication page managed by Cronofy. We use OAuth2 to control access and security.

What does the user authentication process look like?

Users are required to select the calendar they want to authorize Cronofy to access (eg. Apple, Google, Outlook.com etc) and provide their credentials.

Can we white label the authentication process?

Yes, we allow customization of UI elements. You can add your logo to the header for example.

Do you store users’ calendar information?

We store all calendar information including event details, but not their contacts.

Where is your data processing managed?

You can choose between the USA or Germany.

Where is your data hosted?

Either Germany or USA on completely separate instances. No data transfer happens between the two data centers.

How does your pricing work?

Pricing is determined by a) the features you require and b) the total number of users per month. For instance, to organize meetings based on availabilities, it requires the Availability API which is part of the Emerging Plan.

What constitutes a user?

A user is an individual – customer or end-user – who has granted your application access to their calendars. We only recognise them as a user once they have completed the authorization process and connected to Cronofy. A single user can have several calendars synced through Cronofy.

Is it a licence model?

No, it’s an activation model. We only recognize users when they are connected with Cronofy. Billing for the user stops when they are no longer active.

What happens if I go over my included user limit?

We automatically bill you for the additional users at the end of the month. Our team is always on-hand if you want to see which plan best fits your usage.

How is payment managed?

You can pay monthly via a credit or debit card. If you subscribe to an annual Emerging Plan or above, we can invoice you.

For additional services such as Smart Invites – which is billed monthly – and Enterprise Connect – which is billed annually – we will automatically invoice you as soon as these products are activated.

Can you do the integration for us?

No, our objective is to build the APIs for you or your integration partner to complete the integration. However, if you are looking for an integration partner we can advise.

Do you offer technical review meetings?

We offer technical review meetings for customers on our Emerging Plan and above. Everything else is handled via online support tickets.

How do I connect users with Exchange?

First, Exchange Web Services must be activated. Then the user can connect their calendar through our authentication process.

Does Cronofy work with different time zones?

Yes. However, your application needs to identify the time zone of your customers.

How does Cronofy treat tentative calendar events?

In terms of free/busy the recipient is seen as unavailable. This information can also be read from the user's calendar as its actual value.