A free program for Android, by WordBit.

WordBit is an application that will help you learn English, using the lock screen. The idea is to make learning more convenient. You don’t need to remember a lot of things.

The content of the application is divided into different levels. You can learn new words and phrases at each level.

Each level contains examples of sentences. These examples are not random; they are arranged in such a way that you can understand the information.

After each level, there is a review section. Here, you can check how many sentences you learned. You can also add new words to your learning list.

To learn new words, you need to click on the "Learn" button.

You can see the list of all the words you are learning in the "My words" section. You can also mark the words you already know.