This is the only good RPN calculator app I found.
4 points
Just use some HP calculator emulator. That way you don’t have just an RPN calculator, but a full fat graphing calculator.
2 points
I’ve been using Droid48 forever. It’s perfect.
2 points
2 points
3 points
7 points
Not exactly the answer you’re looking for, but here’s some info about Reverse Polish Notation…
1 point
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Realcalc has an excellent RPN mode (enabled through Calculator Type in Settings). I’ve used it for the last six years or so (technically, in the premium version of the app).
Edit: Not open source - sorry, didn’t see the community!