Unit Converter is a free Android-based application that offers easy-to-use conversion of various units. Designed mainly for primary and secondary school students, this app is perfect for anyone who needs to convert units on a regular basis. With the free edition, users can convert units in categories such as length, weight, volume, temperature, area, time, information, speed, energy, angle, pressure, luminous intensity, force, power, torque, and prefixes.

One of the main features of this app is its own keyboard, which makes it easy to input values for conversion. Users can also manually or automatically sort all categories and units, and choose from various styles of the main menu. In addition, users can set the precision of rounding results. However, it is worth noting that the free edition does not offer all features, unlike its paid counterpart, "Unit Converter CE," which can be found in the store.

Overall, Unit Converter is a simple and effective app that delivers on its promise of easy unit conversion. The only downsides are that the app is not optimized for tablets, and there is no search function for units. Additionally, some important categories, such as currency conversion, are missing from the free edition. The app is available in English, Czech, and Slovak.