Does what you expect
Easy to use interface. Clear reading. It just works - that's pretty much the best thing you can say about anything in engineering.
Disappointing, could be a lot more useful
It is not possible to set this app to use SI units so almost useless for anyone who uses SI. ALso no lookup of common property values, e.g. specific heat capacity of water, so all it is is a set of formulae which you can find elsewhere. It could be good if some more work was done on it.
