...It attempts to mimic the functionality of an HP ReversePolishNotation [RPN] calculator with the added enhancement of interval output. So along with your answer, you get a good idea of its trustworthiness.
This app uses GAOL, a C++ library to perform arithmetic with floating-point intervals.
C++ Templates and Ada Package for Automatic Differentiation
...First order derivatives only, forward accumulation.
Choose "files" and either the "initial_submission" directory for the Ada version, or the other directory "cpp_AD" for the C++ version.