There is an offline mode, download the desired dictionaries and lectures and study at your convenience, even without a network connection. To motivate you to constantly study, the so-called goals of the day are provided – memorize phrases five, ten or twenty a day. If you are really determined to communicate correctly in a foreign language, then Memrise for Android is the best choice.
This application was developed not just by enthusiasts, but by professional international linguists together with a team of experienced programmers. Therefore, you can be one hundred percent sure that the courses offered at memrise are of the proper quality. Just a few minutes a day, and in a few months you will be able to communicate easily in a foreign language.