英検®4級の英単語570 - 音声・例文付き英語学習アプリ is an education app by Taro Horiguchi with 10,000+ downloads (about 29K estimated). +106 installs in the last 7 days. Install growth, rank history, SDKs and ad networks.
From the store listing: “Learn the 570 English words required for the Eiken Grade 4 exam with audio and example sentences. Each lesson includes a reading and writing test of 10 words, and review of words you struggle with, allowing you to gradually master their meaning and spelling.”