Quick Converter, developed by Roaming Squirrel, is a free Android unit conversion app that covers an extensive range of categories. The app offers conversions for common units of distance, area, volume, mass, density, speed, pressure, energy, power, frequency, magnetic flux density, dynamic viscosity, temperature, heat transfer coefficient, time, angles, data size, exchange rates, fuel efficiency, audio signal level, torque, force, radioactivity, radiation - absorbed dose, radiation - equivalent dose, radiation - dose rate, data transfer rate, RF power, luminance, illuminance, electric current, blood sugar level, volumetric flow rate, and typography.

Quick Converter also features eight different color schemes for users to choose from. The app is ad-supported, but users can opt for an ad-free version by paying USDor the equivalent in local currency) through the provided link.

Overall, Quick Converter is a comprehensive unit conversion app that is easy to use and provides accurate results. With its wide range of categories and color schemes, it is a great tool for anyone in need of quick and reliable unit conversions.