Meet our new service

A calendar your audience can follow

AddEvent is an
Add to Calendar button,
a Subscribe to Calendar button
and Event Management

If you are looking for an “Add to Calendar” button or
a “Subscribe to Calendar” button or an API for on the fly event
creation or an Event Manager for your website or newsletters,
then look no further. AddEvent offers an easy, convenient
way to create event buttons. It's easy to use and install.

AddEvent was created in Palo Alto, California, May 2012 by
Michael Nilsson and is today considered to be the standard
“Add to Calendar” button on the Internet.

Try our buttons

Add to Calendar 10/14/2016 09:00 AM 10/14/2016 11:00 AM America/New_York Summary of the event

AddEvent example text.

This is the text entered in the event description field. The text can be plain text or simple formatted html. The AddEvent rendering engine converts and formats text beautifully and adjusts the formatting to the selected calendar media.

Example of a link

  • Many of our users use html to add lists like this one
  • HTML lists are converted into bullet lists
Location of the event Organizer false MM/DD/YYYY
Subscribe to Calendar

And our:

  • "Add to Calendar" + "Subscribe to Calendar" buttons for newsletters
  • Event Manager
  • Custom Templates
  • API for on the fly event creation

AddEvent is:

  • Easy to use and install
  • 100% themable
  • Timezone and DST compatible
  • The leading calendar widget in the world
  • Great support (we will actually help you)


You're in good company. Awesome Internet Superstars
and Offline Ninjas use AddEvent too


Install your new buttons in a few minutes

AddEvent helps you create an “Add to Calendar” or a “Subscribe to Calendar” button in a matter of minutes. Get started using our simple yet beautiful pre-built button or customize the design to fit your website or application. Do not worry about daylight savings time and time differences in all the different regions of the world - we have got it covered. AddEvent has been tested by millions of users and is entrusted by companies from San Francisco to Sydney.

Works everywhere

AddEvent is carefully crafted and optimized for the most common browsers, tablets and mobile devices. In our mindset we go "way back" and so does our optimization - our buttons are even optimized for Internet Explorer 6 (yes, some people in the world still use Internet Explorer 6).

What about newsletters, campaign management tools and social media like Facebook and Twitter?

Sharing your event on social medias like Facebook or Twitter is easy with our event management tool. Simply create your event and share it or insert the event link in your newsletters or campaign tools. With our event management tool you are able to provide links for direct downloads or create a landing page where your users can add your event to their calendar of choice.

Custom templates and Direct URL Method (API)

If you’re comfortable hand-coding HTML, then you can customize the apperance of the landing page. We have created simple block elements and tags which makes it fast and easy to setup your own design. You can create an unlimited number of templates.

Our Direct URL Method (API) is a method suitable for developers who develop their own newsletters, work with Flash, mobile development etc.



If you intent to use our services for your personal website, e.g. your blog or your wedding invitation you can apply for a free personal account. With a personal account you can access / use all features on AddEvent. Create a free account and check out the account section for more details on how to apply.

Company only $4.80 /month (if billed annually)

AddEvent will save you months of expensive development. Our services are highly maintained and have been tested by millions of people from San Francisco to Sydney. As a Premium Member our services become unbranded and you get access to all features. Our services include free support.

Key Features Premium
Pre-built “Add to Calendar” button
Calendar generates & downloads Unlimited
Timezone and DST compatible
SSL support (https)
Advanced javascript settings
Change labels in dropdown
Custom options in dropdown
Custom themes gallery
Custom CSS (ability to customize the button)
Supported calendars Apple Calendar, Google Calendar, Outlook, and Yahoo Calendar.
Supported devices All modern browsers and phone devices like Android, iPhone, Samsung, Windows.
Event reminders in Outlook, iCalendar (MAC) etc.
Recurring events in Outlook, iCalendar (MAC) etc.

Pre-built “Subscribe to Calendar” button

Calendar generates & syncs Unlimited
Timezone and DST compatible
SSL support (https)
Advanced javascript settings
Change labels in dropdown
Custom options in dropdown
Custom themes gallery
Custom CSS (ability to customize the button)
Supported calendars Apple Calendar, Google Calendar, Outlook, and Yahoo Calendar.
Supported devices All modern browsers and phone devices like Android, iPhone, Samsung, Windows.
Import external calendars eg. Google Calendar,
Office 365.

Event Management Tool for newsletters and campaign tools, eg. MailChimp, Marketo, Salesforce, CampaignMonitor, flash, iPhone, Android etc.

Direct URL Method (API) for dynamic calendar creation with optional landing page
Custom landing page for events
All AddEvent branding removed
Support Priority


Building AddEvent with our users is the real deal to us.
We keep track with all changes made so our users are kept in the loop.

Update (Friday, September 2, 2016)


One thing that has been bugging us for quite some time now is that it's difficult (and sometimes impossible) to add an event from popular media channels like Facebook and Twitter.

The problem: Apps like Facebook and Facebook Messenger are run in web-views that are stripped from default browser functionality. That means invoking the default behavior of a .ics file is impossible. For instance, the Facebook Messenger app just displays the content of the .ics file. That is just silly and unusable to all users.

By changing our approach in these sort of applications, we have finally solved the issue.

We have updated the functionality of the "Add to Calendar" button version 1.6.1. That also effects the events landing pages.

Update (Monday, August 15, 2016)


One of our users asked us to add "method" as an option in the generated calendar files (.ICS) - used by calendar clients that support .ICS files like Outlook, Apple Calendar etc. Our user was doing something simple yet complicated in the world of calendars - at least when dealing with multiple calendar systems like we do. He wanted his users to add an event and if it was changed he wanted to push an update and have his users update the same event.

We, by default, set the event method to "publish". With the new "method" parameter you are able to change the value telling the calendar clients that the event has changed. Normally you will have to combine that with your own unique UID which is another parameter you can change too.

This recent change is very "nerdish" and definitely not for everyone and we love our users for requesting new tweaks and updates to the parameter set.

Update (Tuesday, July 19, 2016)


When you are using the "Add to Calendar" button on a website you should white list the domain in the "Domains" section. We frequently get asked by users, who use AddEvent for multiple websites, if we can make this process automatic.

We have added a new tag ("client") in the "Add to Calendar" button code which is an account identifier. When added, domains are automatically created in the accounts list of domains.

We have also made some changes in the "Domains" section. Before you had to add sub domains and the root domain. Now you only have to add the root domain. We have added domain control in the section as well, which allows you to delete / disable a domain, e.g. if someone exploits your client id or if you don't use the domain anymore.

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