Good but one suggestion
It works as described and I have experienced no problems after using it for several months. I use it to create contacts for things like work related passwords, family members social security numbers in case of emergency, etc. Only complaint is I wish there was some way to backup the bbCalc data onto something else, ie a file, so I would not lose this info if my iPhone gets lost or breaks.
User of bbCalc about
bbCalc Private Contacts, v1.4.11