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It is a chord and scale library and does not show how those things relate or present them in a way conducive towards study of that. If you know how the information this app provides is related then you probably do not need the app for theory. Theory is not memorization of chords, scales and progressions; theory shows you how to construct those things so you do not need to memorize everything.

A slide rule would be more analogous to a musical instrument. If you want an analogy between this app and engineering in the slide rule days, it would be closer to a pocket sized reference book of log tables and formulas.

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So you're saying this thing doesn't teach theory. Fine. But I don't think it claims to do so.

I did not say that at all. This programs relation to theory is about the same as the relation between numbers and calc, while numbers are very important to calc you are not learning or using calc by using numbers, there is a hell of a lot more to it.

I sort of see where you are coming from, but "music theory" is the standard accepted term for this general field of study, which includes the fundamentals (notes and chords and more). source: used to teach music theory at the university level

The accepted term for this would be method, learning by doing which is the opposite of theory but generally provides part of the foundation for learning theory. Learning by method is the way the vast majority learn to play and write music and really is all most people need or want. Theory is not of much use for most musicians, a concept of key (intuitive or literal) and what works with a key is all they need. How instead of why.

Perhaps this is being pedantic but these sorts of distinctions are fairly important, understanding what you do and do not know will make you more effective at learning and help you identify what is of use for you to learn. As someone who taught this stuff you should know that the ones who are most difficult to teach are the ones who think they already know.