Most Japanese books follow the traditional vertical typesetting style of ancient Japanese texts. Therefore, using some specialized vertical typesetting software designed for the Aozora Bunko can provide a better reading experience. Additionally, Aozora Bunko uses Ruby tags to annotate some Chinese characters with kana. Specialized reading software can recognize these Ruby tags (ルビ) and convert the phonetic kana into "furigana," making it more convenient for reading.