Otavan sanastot is an application for finding vocabulary in various languages. It includes all the vocabulary of the English language series of the same name. The application is designed for both Android and iOS devices. It can also be used on tablets.

The application includes the most important words of the language, based on the official grammar. The words are arranged in a way that makes it easy to learn the language. The application also includes the most important words from the text books of the same name.

The user interface is designed in such a way that it is easy to use and intuitive.