“The API was brilliant to work with.”

— Greg Dickson, Developer, Appointedd

Connect to your customers' calendars

Microsoft’s personal email hosting has had several names over the years: Hotmail, Live, and of course, its most recent name, Outlook.com.

Outlook.com is used by millions of people across the globe, meaning that if you want to reach your customers you have to integrate with it.

However, not every customer uses Outlook.com. There will inevitably be customers who favour Apple Calendar or Google Calendar instead. Building integrations with each API individually costs time and money. Maintaining them costs even more.

A better way to build

Cronofy allows you to create features for multiple calendar services while only needing to work with one API.

Whatever you build with the Cronofy Calendar API will work with Outlook.com, Office 365, Microsoft Exchange, iCloud, and Palladium Low Grey P07 Women’s Gaetane Aborigene PLDM TWL Perla rPWarRq.

That means that you can create a more user-friendly experience with advanced functionality and a workload that’s five times less than if you'd worked with each API individually.

Cross-calendar synchronization

Loafer Shoes Leather Women's Khaki On Kunsto Slip When you create an event in Outlook.com and invite someone who uses Apple Calendar or Google Calendar, two versions of the event are created. Should any changes be made, there's no guarantee these will sync across. This could cause all sorts of confusion for your customers.

When events are made using Cronofy, it doesn't matter what calendar service customers use. Everything updates in real-time, preventing any double-bookings or potential confusion.

Greater user privacy

Outlook.com integration is limited because it offers an all-or-nothing approach to accessing customers’ calendar information. That means that you can either access all of their personal details, or offer them a lesser user experience but greater privacy.

With Cronofy, you can create a connection that can see when a user is free or busy without accessing this personal information. Users’ private data stays private but they also don’t risk double-booking themselves.

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Sync your software to iCloud, Google Calendar, Office 365, Outlook.com and even Microsoft Exchange

Cronofy also offers...

Personal support


We’re here to answer your questions and help with any problems whenever you need assistance.

Global environment


Cronofy has been built for easy integrations across all languages and services, not just Microsoft and Windows.

99.95% uptime SLA


Cronofy is highly reliable, with a minimum average uptime of at least 99.95% guaranteed.

Always in active development


The Cronofy API has been under active development since its creation, and we frequently release new features and list upcoming alpha features.

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Optimized data handling


Security and privacy are top priorities, so businesses and end-users can rest assured that data is handled legally and safely for all parties above and beyond the Outlook.com API’s standard.

Synchronization and scalability


One user or one billion, Cronofy scales to your requirements. Advanced synchronization means calendars that are always accurate.

Finely-tuned privacy


The standard Outlook.com API requires a lot of work to meet minimum privacy and security standards. Cronofy’s better data modelling means peace of mind for developers, businesses, and end users.

“Cronofy is an excellent value add to our clients, who constantly move between using JobAdder and their external calendar during their day, improving their overall workflow.”

— Erin Chmelik, Product Manager, JobAdder

Ii Angel Leather Burgundy Dress Women's Soft Style Pump OPqB1w for a free Cronofy account and then follow our quick Getting Started tutorial that covers everything you need to know.

Where do I get my Outlook.com Calendar API key?
The Cronofy API key includes Outlook.com calendar API access as well as all the other major calendar APIs – sign in to your Cronofy account for instant access.

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How much does Cronofy cost?
We’ve developed a scalable pricing system so that Cronofy is affordable whether you’re experimenting with a hobby project or designing a system for millions of users. If you’re just creating events, our API is free. It’s also free for the first twenty users you have. Beyond that, it’s one flat free without any charges for API transactions or events. See our pricing page for details.

Where can I see Cronofy being used?
As the Cronofy API plays a backend role in companies’ systems, we’ve created Sample Apps and Use Cases so you can get a better idea of what you can do with our API and how it works.

What programming languages are compatible with the Cronofy API?
You can code in whatever language you like; we have developers using C#, Java, .NET, PHP, JSON, and pretty much any language you can think of. If you’re using a common language like PHP or .NET, check out our code libraries.

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I’m not a Microsoft-registered developer. Can I still use the Outlook.com Calendar API with Cronofy?
Absolutely, you don’t need to be Microsoft registered, accredited, or certified in any way to use our API or the Outlook.com API.

I have another question, how can I contact you?
Feel free to email us any time and we’ll try to help! If you have a support query, please get in touch at support@cronofy.com.

To find out more about Cronofy, book a demo or email hello@cronofy.com.

Try our API

Get started for free with up to 20 users. Don't pay until you go live