Which calendar features are essential?

2 points by logermoore ↗ HN
I'm considering making a(nother) web-based calendar application. Which features are essential to you? Do you use text (SMS) reminders?

2 comments

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No SMS reminders as I have a smartphone, which brings me to THE essential feature: the ability to sync with a phone. By sync I mean that it should either have a standalone application or use a built in application on the phone (Exchange), being accessible via the phone browser does not count.

Most people have a phone on them all the time, making it the perfect device to keep a calendar.

Thanks for your comments. Why is a browser-based app a problem (if it does what it's supposed to do)?