A free app for Android, by Wordpandit.

Vocabulary Flashcards is the most efficient and user-friendly way of learning new words. If you want to learn how to speak a foreign language, this app is the best way to do it. With Vocabulary Flashcards, you can learn new words without having to spend a lot of time and effort. The best thing is that this app is free to use. There are no hidden costs and you will not be required to pay a penny to use it. This app is ideal for you to learn new words. It has a very simple interface. All you need to do is select the level of learning you want to start with and start learning. You will then be presented with a list of words. Each word is accompanied by a memory trick, synonym, antonym and usage example. The best part of this app is that it has a built-in test engine. This helps you to test yourself and make sure that you are learning correctly. The app will then show you the result of your test.