Material Unit Converter is described as 'Smart unit and currency conversion app with simple yet elegant material design' and is an app in the Education & Reference category. There are more than 10 alternatives to Material Unit Converter for a variety of platforms, including Android, Online / Web-based, Windows Phone, Linux and iPhone. The best alternative is Unit Converter Ultimate, which is both free and Open Source. Other great apps like Material Unit Converter are unitMeasure (Paid), multiConvert (Free, Open Source), Unit Wolf (Free) and ConvertPad (Free).
With over a hundred measurements, and fifteen categories, you won't need to search the internet or fiddle around looking for answers anymore. This is a completely offline solution, with no permissions whatsoever.