apps to learn english

This blog has looked at lots of learning apps over the years - for example:
Jay Doubleyou: voice tube: videos to help language learning
Jay Doubleyou: free pronunciation app from adrian underhill

Here are some more lists:
Download free English pronunciation software
15 Best Free Language Learning Websites and Apps
94 English Grammar Resources for Effective Learning and Fun | grammar apps

Here are some other sites to try:
English Irregular Verbs - Android Apps on Google Play
Color Verbs- English Irregular Verbs App - Download for Free on Mobango.com

And:

Sounds: The Pronunciation App
Sounds: Pronunciation App FREE - Apps on Google Play
‎Sounds: The Pronunciation App FREE on the App Store
And:
VoiceTube: Learn English through videos!
VoiceTube | AngelList

Plus of course:
Google Translate - A Personal Interpreter on Your Phone or Computer
Google Translate - Apps on Google Play
‎Google Translate on the App Store

And then we have Duolingo which makes learning languages like a game on your mobile: Duolingo: Learn Spanish, French and other languages for free with some reviews here DUOLINGO Review - What is Duolingo and what do I think about it? - YouTube and here: Learning the Duolingo - how an app is speaking volumes | Business | The Guardian

If you want to spend some money:
Learn Spanish, French or Other Languages Online - Babbel.com

Finally, here are some not-so-fine apps:
Jay Doubleyou: high-tech surveillance in the classroom: 'to capture every word, action, and interaction, for potential analysis'
Jay Doubleyou: teaching machines: behaviour management apps in the classroom
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