青空司書 is a versatile text reader and downloader designed specifically for the 青空文庫 (Aozora Bunko) library. With this app, users can download works from the Aozora Bunko library and read them in vertical text format. It also supports reading other text files and offers features such as text-to-speech (TTS) and voice recognition. Users can customize the text size, spacing, background color, and text color according to their preferences. The app provides a comprehensive search function for both Aozora Bunko works and text files, making it easy to find and access desired content. Other notable features include bookmarking, note-taking, and the ability to manage reading progress.青空司書 is free to use, with an option to remove ads.