LearnLang is a free language-learning app for studying vocabulary with English as the base language.
Study official HSK 3.0 vocabulary from HSK 1 through HSK 7–9. Each English word is paired with Chinese, Korean, Japanese, Spanish, or Portuguese, including example sentences and audio.
Study Oxford 5000 B2–C1 vocabulary plus a CEFR C2 extension, with English definitions and example sentences.