Personally I use Duolingo, (in my opinion it's the best free app) but I am also using Rosetta Stone for German, but that is a bit expensive. Duolingo is perfect if you want to practice around 5-10 minutes a day.

For learning vocab I recommend you download "Quizlet". It's really good for finding different ways to help you memorise words. For translations, I find "WordReference" the most trustworthy as its translations are always spot on. As for actually learning languages, I'd recommend Babble but it can be a bit "planned" sometimes, so of course I'd say the best way to improve your English is just to practise!

Hi everyone, I have practiced pretty with Memrise for months (target language: French and Spanish) and from my point of view it could be very useful for beginners to help them learn new terms and build up and basic vocabulary (maybe also get a little exposure to pronunciation, or at least if your target language is not so different from your native one) ... Moreover that wouldn't be the best choice for achieving a master level or understand grammar rules ... but these are common side effects of Memrise and other similar apps. Mastering a language requires more than that: face-to-face (even remote) practice and conversations with real people. My two cents: give all these free apps a try and then keep on using the one that suits you best ;)

I recommend https://www.penpaland.com its a language exchange-based social network website.