Nice looking calculator using Reverse Polish Notation (RPN) written for Windows.
It supports DEC, HEX, BIN, OCT numbers, GRAD, RAD and DEG.
License
BSD LicenseFollow RPNcalculator
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    User Reviews
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    I love the RPN calculator. Only problem is that it takes very long to load first time on Windows 10. Wish there was a way to make it load faster and pop up sooner.
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    Very nice functionality; it is now my main Windows calculator. I find it it's design somewhat too bulky and colors are not ideal, but this is of course minor points. Overall, very good work; probably best RPN calculator currently available for Windows.
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    Good looking RPN calculator, but it comes up with inaccurate numbers some times (for example, 18.7-11.9-6.2=0.599999999999999 instead of 0.6). Emails to developer bounce, so it may be abandonware at this point..
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    This is excellent. No need to look for anything else except version 2.0.1. ;-) Comments: 1. Indicators for number system and angular units not working for me on Win7. 2. Symbol on multiply key is identical to x on variable "x" key. (Suggest "*" or ".") 3. Minus sign on subtract button is a hyphen. Needs to be wider. Thank you.
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    clean design + functional = nice (lol, not rpn). my new go-to calculator for windows. EDIT: also do agree with cursor at start of number issue (minor though)