Google Calendar vs Yahoo Calendar

Google Calendar
Google Calendar is a free time-management web application offered by Google. The Ajax-driven interface enables users to view, add, and drag-and-drop events from one date to another without reloading the page. It supports view modes such as weekly, monthly, and agenda. Google Calendar allows multiple calendars to be created and shown in the same view. Each can be shared, either read-only or with full edit control, and either with specified people or with everyone (public calendars).
Yahoo Calendar
Yahoo! Calendar is a Web-based calendar service from Yahoo!. It can read calendar feeds and events syndicated from sites that make use of the published Yahoo! calendar programming interfaces.
Comparing Google Calendar vs Yahoo Calendar is like comparing apples to oranges. Because your business is unique and nobody except you can decide, which is better for your company. But we can add some fun to your research and suggest some new comparison parameters.

Ok, now let's compare the UI. Looks like Google Calendar has more user-friendly interface than Yahoo Calendar because it's bigger. At least on our screenshots

To compare the popularity of the solutions we counted how many alternatives people search for each of them on the Internet. And it turns out that Google Calendar is more popular than Yahoo Calendar

Now let's look at the recent activities of our competitors:

- Google redesigned Calendar for web (in 2017)
- Google Calendar improves integration with Microsoft Exchange (in 2017)
- Alexa now works with G Suite calendar (in 2017)
- Google Calendar added reminders on the web (in 2016)
- Google acquired mobile calendar app Timeful (in 2015)
- Google Calendar is available on iPhone (in 2015)
- New Google Calendar for Android allows to enter events automagically (in 2014)
- Google restores offline access to GMail, Calendar and Docs in Google Chrome (in 2011)
- Google Calendar arrives (in 2006)

Looks like Google Calendar was recently more active than Yahoo Calendar (at least in our news). We also found some news, in which Google Calendar and Yahoo Calendar meet head to head:

2015 - Google acquired mobile calendar app Timeful to fight Yahoo Calendar

Google has acquired the calendar app Timeful that is intended to reduce stress, increase productivity, and bring better life balance to all the people overwhelmed by everything that competes for their time. The app worked by initially learning the daily scheduling habits of its users, before using notifications to help prioritize certain tasks. If the user stated their intention to go to the gym three times a week for instance, the app would offer suggestions and reminders for scheduling those sessions in during a user’s free time. Google plans to apply Timeful’s technology “across products like Inbox, Calendar and beyond,” Product Management Director Alex Gawley said in a blog post.