Very well done
Update: Now that the iPhone 5 has been out for a year, its shameful that HP has not bothered to do an update. So much wasted screen space. And the poorly implemented clicking is starting to bother me and my coworkers. Otherwise...
A great app to have on the iPhone when I dont have my 15C LE with me. HP doesnt mention it in the description, but the app uses razor sharp Retina images. The portrait-mode with the big buttons is a nice touch and suitable for most of my calculating needs. The full landscape mode, although small, is nearly as easy to use. I feel fortunate not to be disturbed by
the key-click sound, although I agree that folks that dont like it should be able to turn it off from within the app. I really appreciate the manual being accessible from the app. I have tried 2 other 11C/15C iPhone apps, but they dont have the attention to detail that HP has put into this. Pricey by app standards, but cheap by quality calculator standards. Highly recommended.
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HP 15C Calculator