Mostly adequate, but plenty of room for improvement – Convert Everything FREE Review

I've tested over 20 Conversion Apps recently, and I found "Convert Everything FREE" to be mostly adequate, but not a standout - mostly because it is missing too many common units. MY PROS: * Accurate results in all 5 of my essential test conversions (area, distance, volume, weight, temp) * Has all 11 of the top 11 most common/essential categories, but no more * Has Currency conversions (Internet needed for updates, of course) * Has a nice Language Translator (needs Internet because it uses Google Translate API) --- Hint: when using the translator, try using phrases instead of just single words (ie, "Which street?") * Able to hide unwanted categories * Last updated five months ago, so perhaps the developer remains committed to the app * FREE! (There is an ad-free version available for $0.99) MY CONS: * Missing many common units (Volume: no cooking units; Weight: no stone; Area: no acre; etc.) * I couldn't find any way to input negative numbers, which is necessary for winter temps * User-interface is unconventional, and awkward even when you understand it * Fairly hard to select alternate units to see additional results (tap, scroll, tap) * Does not retain the most recent units used or numeric input entered for each category, even within a session * No ability to hide unwanted units (set favorites) * No ability to add additional categories or units (like myConvert and a2z Pro) In summary, this is a fairly nice app, but it would be nice to have more categories and units, and more control over them.
Review by MoonSmiles on Convert Everything FREE.