Too simple, no way to evaluate pro without buying
Like most of these omnibus electronics apps, it covers all the basics and hides all the real calculators behind a paid app. What it doesn’t let you see, however, is that the pro features lack anything but the basic calculations. Bandpass filter calculator? Sure, if one pole and no way to specify the filter type is all you want. Sadly this app is like all the others… don’t waste your money. To the developer: spend the time to document what you are providing, offer a trial version of the pro features so we can tell if paying the full price is worth it.