Unit Converter - Pro Units App 4+

Have many of this developer’s apps including ALL PAID versions of iMetalBox, Ruler, Converter, ETC. Currency converter is nothing more than a scroller screen and does ZERO conversions (even after upgrades). Developer Website is BOGUS and some 3rd party web client and ZERO OPTIONS FOR SUPPORT!! $20 in app upgrades wasted on a bogus developer with ZERO SUPPORT!
FORMALLY REQUEST RESPONSE FROM DEVELOPER REGARDING THIS MATTER!!

Update - After writing the review below, and before deleting the app[s], I looked for the app’s settings. To my surprise, neither Unit Calculator Pro nor Unit Calculator + (yes they are two different paid apps rather than upgrades of the base version) could be found within my phone’s settings menu. The app was nowhere to be found! Everything about this app screams spyware or worse. I voiced my concerns, like many others have, to Apple, but I could not request a refund because the app I paid for twice does not show as refundable for some reason. I don’t know how Apple can claim that they thoroughly vet every app in their store when a surreptitious and deceptive app like this lives on the platform. I want an explanation and my money back, but I’m not holding my breath.

Original Review - The app seems ok, but the lack of a help section is an issue. More concerning is that the “app support” link brings you to a “page not found” error. After paying to upgrade to +, I am feeling like I made a foolish purchase. I bought the app because the developer claims that data isn’t collected, but the lack of a user manual coupled with a missing dev website makes me highly suspicious. Anyone charging for their app should provide instructions, and a functional website should be mandatory. I am considering removing the app and contacting Apple.

TL:DR:
1) great app if you splurge & pay the bank-account-breaking, one-time fee of $2.99; pretty much useless if you don’t.
2) I’m ticked that the calculator seems to have disappeared. (would’ve been 5 stars)

I’ve been a long-time user of this app and, yes, you now have to pay a one-time fee of $2.99 to use more than 4 of the least commonly used unit conversions, but big deal. I don’t understand people who, like me, were using it prior to the upgrade, getting so ticked off about that - it was a great app and the developer probably should’ve been charging the fee from the get-go. That being said, if you’re not willing to pay the $2.99, I’ll admit it’d be useless, so you shouldn’t even bother downloading it to try it out. What frustrates me, though, is that it appears to have lost the calculator function. Having everything in one app was extremely handy. Having to download another app just so I can use a basic calculator stinks, hence the 3 stars.