A classic! Powerful!

Im not sure if this is *the* best calculator app for iOS, but it has to be close to the best. I had PowerOne on my first Handspring Visor over 15 years ago and on various Palm devices since I moved to my first iPhone. Before I got my first iPhone, I had a Palm Pre and missed this app terribly. I was quite excited to see the iPhone version in the App Store and it was one of my first app purchases. The iPad version is even better. The templates are outstanding, numerous, creative, and quite useful for a variety of purposes. The developer continues to improve it as iOS evolves. Its an app I use very often for a number of reasons (e.g., price comparison, figuring loan amounts and payments, unit conversions, and, of course, basic and advanced calculations). I highly recommend this to new iOS users. Definitely one of my favorite apps!

boboq about powerOne Finance Pro, v4.1.6