A lot of people use Google's Calendar on their desk top computer's to keep their lives organized.
If you like the way it works give the app a try as a mobile version offers various similar functionality and syncs across all devices.
It's a free download for Android and IOS phones.
For those who like a visual display of their day, check out the free app Cal, it lists your tasks and to-dos in a chronological list and lets you customize the background photos for a beautiful and personal experience.
If you're looking for a calendar that almost serves as a personal assistant, check out Tempo, free for iPhones.
This app syncs with your e-mail and automatically adds extra details into each calendar listing.
Like an address or who's going to be there.
For travelers, the horizon ap for iPhone users or Sol for those with Androids, might be a good options since they list the weather forecast next to your events.
For more calendar ap reviews and recommendations, visit cnet.com.
In San Francisco, I'm Cara Savoy, cnet.com for CBS news.