Improve your English vocabulary with memes and quizzes
PROS: From TOEFL practice to phrasal verbs, Memrise offers a variety of courses with flashcards. Take courses created by other members or create your own course. Memrise has a scientific algorithm that interrupts your study flow and quizzes you on words and definitions. You can choose a picture (meme) or add your own to help you remember vocabulary. Memrise is free, but a paid account offers more activities.
CONS: Memrise doesn’t help much with other skills (speaking, reading, writing, listening). Vocabulary is about all you will learn from Memrise.