App offers fertility guidance based on vital stats

A company in Boulder is poised to launch a for-pay version of a smartphone application that helps women figure out which days of the month that they’re most fertile.

A free version of the fertility charting application from Kindara Inc. has been downloaded by 75,000 people.

About 75 percent of the app’s users are trying to get pregnant, while 25 percent of the users want to remain babyless, said Kati Bicknell, who launched the app in May 2012 with her husband, Will Sacks.

The couple said when women input information on their body temperature, the time period of their monthly cycle and “custom”…