On apps for English language learning

Apps can allow anyone who has a smartphone to carry a language laboratory around in their pocket, so that opportunities can be taken for language practice when travelling, waiting for someone to arrive for a meeting or enjoying some 'me time' in a coffee shop.

Over to you
Explore what is available here.
Post a message with your comments on the app that you think is most valuable for you, with a brief commentary on why you like it.
(You may also wish to take the opportunity to review the app on the publisher's website.)