BurningVocabulary - Touch and highlight YouTube & Netflix subtitles
Word of the Day - Learn one new word, every day
Duolingo - Duolingo is a free language learning app for iOS, Windows and Android devices. The app makes learning a new language fun by breaking learning into small lessons where you can earn points and move up through the levels. Read more about Duolingo.
Vocly - Learn vocabulary in 50 languages with fun games
Wordd - Quickly look up vocabulary, abbreviations, acronyms, slang
Synonymful - Improve your vocabulary and communicate like a pro.