CalConvert: Pro Calculator $€

Updated Notes: Still the best! AWESOME!! Thanks for the update. The nicest looking, most awesome calculator in the App Store is now working full display on the iPhone X, and man it is sharp! This has more conversions functions than I have ever seen in an iPhone app. If you get the app and, for example, you want to convert lengths. Tap on the favorites button, and that reveals all of your options. Simply put stars on all the conversions you use, and they will all be there each time you switch to that function. There are so many "skins" or calculator designs, it is just way more fun to use this calculator instead of the native calculator app. Both calculator and conversion calculator work great on the Apple Watch. I found this app because all of the other conversion calculators I've had for years are not working anymore, and I’m glad because my search lead me to this one! I use this calculator everyday at work when reviewing construction plans. If you need one calculator to do everything, and look awesome while using it, this is the one!

I am not satisfied with this product. The version of this calculator which I paid had a choice of Theme in which the background is brighter and the numbers are printed in black. Now the same topics are there but whenever I choose a theme in black letters, the black letters do not appear on the display.

This app has some nice features and a great uncluttered interface on phone and tablet. Plenty of conversions and scientific/math functions. However, their are no scientific functions available for the watch. I use square roots quite a bit and it would be nice to have a few more common functions available for the watch. Also a fraction calculator and tip calculator would be great.