HP 12C Platinum Calculator

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Every time you open the app the number of decimal places is set back to 2 decimals by default. If you want 4 decimals, you need to reset it every time. The app key gives a sound of double click every time you press one key which is irritating. To sum it up, this HP12C Platinum has got a step motherly treatment from HP compared to the regular HP12C. No wonder the reviews are bad for this. HP should be able to revamp it easily by spending pittance. For some reason they don’t want to. Also this app was updated after quite some time when apple’s IOS update warranted it leaving all users in the lurch. Numerous demands from app users pushed HP to give this sloppy update. Stay away from this app.

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Hewlett Packard has a loyal following and a reputation for highest quality - and for correcting problems when they arise. (Early HP scientific calculators actually were recalled and replaced when a tiny bug was discovered.) But a business calculator that makes elementary-school math errors (e.g., in squaring a negative number) is unforgiveable! The calculator on which this app is based goes back to 1981, and among financial wizards both old and young, it is still the gold (well, platinum) standard! This iPhone version appears to have been introduced in 2009, which should have allowed HP plenty of time to get it working credibly under OS 3.1 or later.

As of October 21, 2017 this app works great in iOS 11. Given that HP is now using a cheap low cost provider to make the new physical calculators out of Asia, this app is the only HP12c worth buying. The new physical calculators don’t register half the keys if you type fast. This app is great for iPhones and iPads. Make sure you get the platinum version in order to have the latest features such as backspace.

I just downloaded the app and it works fine. I was able to lower the volume on the keys. It flipped to horizontal quickly. It has nice new features like Undo if you clear a number by mistake. It has back space so you can correct a number. It also has a built in quick start manual for new users or if you forget how to input something. It's really great to have an HP in your pocket. Very satisfied.

Six years ago I wrote a review and gave it one star because of some math inconsistencies that were also at odds with the way the real 12CP worked (I still have two of them). I had honestly forgotten about this review. I revisited the app and now give it 5 stars. It seems to now work like the hardware version in everything I checked. This is as good as it gets.