DEEP Book app for iPhone and iPad 4.0 ( 1840 ratings ) Utilities Developer: Renwen Mo Free Current version: 1.1, last update: 8 years ago First release : 10 May 2016 App size: 18.59 Mb 北京深度沟通有限广告公司图书借阅工具，方便同事间查询图书借阅情况。