Learning English with apps

In this post I want to recommend you some apps for learning English. Most of them are free but you can find as well a premium version that you will have to pay for. Have a look at them and give me your opinion. Have you ever used other apps for learning English that don't appear here? Please share them!

1. WordReference: This is a dictionary app. It is very useful for translations and synonyms.
2. MosaLingua Lite: It is a basic vocabulary app related to specific situations.
3. Busuu: It is a complete language course with different levels.
4. LearnEnglish Grammar: It is an app from the British Council with lots of grammar exercises.
5. Vaughan Radio: This app is for developing your listening.
6. Sounds: Pronunciation App: It is a good Macmillan app for relating spelling and pronunciation.