CoderCalc

Really well done! Hexadecimal +binary base conversion, love the flexibility in data entry - decimal/ hex/ binary, and the mix. Cool app!!

Great app on 3gs. Loads quick; has just about everything I need.

One of the nicest RPN capable apps not copying a HP...

I saw this calculator and read the reviews and saw that it was just what I was looking for: a good, RPN-capable, easy-to-use programmer's calculator to replace the built-in calc. So I bought it. Unfortunately, it turns out it's only capable of part of what I mentioned above: It is a simple-to-use, very good RPN-capable calculator, but it can't REPLACE the built-in for me. It loads WAY too slowly right now. When you need a calculator on your phone, you usually need it NOW. From the time you press the button, it takes anywhere from 5 to 9 seconds to come up! That's an eternity if you're standing in line somewhere to calculate a price, or gas mileage at the pump, etc. Hopefully, this is something the developer can and will fix. If so, I'll certainly revise my review to reflect the change. If not for this lag, I would gladly have given this app a full 5 stars. It's that good, once it starts up.

Best RPN scientific and programmer's calculator I've found so far, at a bargain price! Entry/stack similar to my HP-15C.

To be a coder's calc, needs: 1s complement as well as 2s; ASCII/UTF codings, octal, consistency in operation and display. And Log base 2 of 1 is 0, not infinity...

Coder Calc so far has had the best value I've ever seen from the app store. I've tried at least 3 other RPN calculators, and they all work ok with varying degrees of comfort, coolness, and ease of use, but so far Coder Calc is the best by far. What I love about Coder Calc is the multi-line display, and especially the fact that even when something scrolls off the screen, it's still in the calculator's memory. Of all the other RPN iPhone calcs I've tried, only one other has multiple stack lines visible (Classic RPN Calculator), but if something scrolls off the screen above level 4, it's forgotten and gone forever. Coder Calc won't forget. Other than that, all other RPN calcs I've seen only show one or 2 levels, and to me it feels like tunnel vision. Coder Calc has an arbitrary-base logarithm key. I've never seen that on another calculator in my life, and I am truly impressed with this app. Usually I had to look up the change of base formula and figure out how to use it, but with the arbitrary base log key it's much more streamlined now. The developer has been extremely attentive and receptive to customer input, and takes our ideas and suggestions for further improvement seriously. I actually took a screen shot of Coder Calc and Photoshopped it to show the developer how to use space more efficiently to fit another row of buttons on it (dedicated SWAP key!!!), as well as ways to improve the user interface by dropping duplicate commands, making the stack lines numbered and scrollable, grouping closely related commands together (10^x, log, and EEX), and she wrote me back the very next day taking my ideas seriously, praising them, promising to look into them for the next version, and boosting my ego. :-) Odds are the next version will have more buttons and be more awesome. Long story short, customer service is excellent. Coder Calc also does logic-oriented operations in HEX and binary. All this for one dollar. I expect this to be the RPN calculator I keep after trying out all the other ones in the iTunes store.

If you need a calculator that has support for decimal/binary/hex as well as lots of logic operations, this is one of the better ones. It also brings a full complement of arithmetic & trig functions, in case your programming takes you in the unknowns of actual math ;) For those of us always in love with the old HP calculators, it (of course!) supports RPN in additional to the more conventional calculator mode. And to make every programmers heart beat faster, you even get a multiline stack display ;)