A文庫 (pronounced "Eebunko") is an e-book reader app that displays text files in vertical writing format based on the Aozora Bunko format. It can be used to download files from Aozora Bunko or to call from other apps like Aozora Provider and File Manager. The app also has a function to select a text file in Aozora Bunko format on the SD card. The app is designed to be simple and nimble, making sure that it does not interfere with your reading experience.

The app has temporarily implemented a search and download function by author name and work name, but the operability is not good. The developer is planning to improve it soon. The app supports emphasis marks and bold notes, but the developer plans to deal with sidelines, indentation, and prohibited relationships as soon as possible. The app also has a provision to select the background color. However, it has stopped operating normally due to changes in the environment such as Android OS and cloud, but the developer is currently working on supporting the latest environment.