Study and test knowledge of the 20 standard acids through customizable quizzes. Topics include names, structural formulas, 1-letter and 3-letter codes, codons, and side chain classes. Quizzes are available for free. Remove ads with an in- purchase.
Learn vocabulary through spaced repetition system for improved retention. Create and customize flashcards with text, images, and audio. Review cards based on performance and difficulty.
Learn English through daily listening and speaking exercises, accent training, and real conversation practice. Access lessons, read accompanying texts, and repeat phrases to improve pronunciation.
By writing Hangul characters with guided stroke order practice. Listen to and speak phrases to improve pronunciation. Build reading, writing, and speaking skills through interactive exercises.
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Solve word puzzles by finding hidden words in images. Each puzzle reveals letters as words are solved. Choose from over 1000 levels. Play in multiple languages including English, Spanish, and German. No in- purchases required.