Much like the hardware store that jacks up the price of snow shovels in the middle of a blizzard, so too will ContractionMonitor screw you over at the wrong time. It provides for entry of 20 contractions for free. That lasted about 1.5 hours, and just as my wife started a really painful contraction, ContractionMonitor told me that I had to upgrade, which of course I did. "What's going on, this really hurts," she says. "Hold on honey, just need to enter the credit card info, you doing okay?"
Of course, when you update, your prior information does not port over to ContractionMonitor you just paid for, meaning as your wife is in labor and screaming at the top of her lungs, "What the hell is my frequency?," you can't tell her all that effectively.
Bottom line, do not get the free version of ContractionMonitor. Either pay the $0.99 well in advance (the program was working fine while we used it) or avoid it altogether. A little more disclosure by the designer would have been appreciated. My wife thanks you.