曲奇云盘 is a free iPhone app developed by Hangzhou Quqi Information Technology Co.Ltd. It falls under the category of Business & Productivity. This app offers various features to enhance file management and sharing.

With the group function, users can create and join groups to share files with friends. Sharing a file within a group automatically makes it available to all members, eliminating the need for individual downloads. Additionally, users can preview photos and documents in real-time without downloading them.

The app provides a multi-level directory system for organized file management. Users can easily locate files with precise search and navigation capabilities. Moreover, 曲奇云盘 supports real-time online preview of multiple document formats, allowing users to efficiently read and work with files.

For video playback, the app offers high-definition streaming with adjustable playback speeds. Users can fast-forward through boring parts or speed up exciting moments.

曲奇云盘 provides a generous storage capacity of 2TB upon registration, which can be expanded to 10TB with a single click.

Please note that the app offers a subscription service called "星耀会员" with different pricing options. The subscription is automatically renewed and can be managed through the user's iTunes account.

For any suggestions or questions, users can leave comments or contact the developer via email or through their official Weibo and WeChat accounts.