Mostly adequate, but plenty of room for improvement

Ive 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 couldnt 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.

MoonSmiles about Convert Everything FREE