ShuBook 2M is a user-friendly OPDS book reader and organizer that also works well with Calibre. It’s designed for anyone who loves reading and wants an efficient way to manage their books.

With ShuBook 2M, you can read a variety of DRM-free books. This includes both fluid-layout formats, such as EPUB, TXT, and UPDB, as well as fixed-layout formats like PDF, RTF, DOC, XLS, and PPT. You can easily switch between horizontal page-turning mode for fluid layouts and vertical page-scrolling mode for fixed layouts. Whether you prefer portrait or landscape orientation, ShuBook 2M supports all your reading preferences.

One handy feature is the built-in dictionary lookup. Simply long press on any text to look up words, read aloud, or copy passages. If you ever switch devices, don't worry—your book reading progress syncs effortlessly via AirDrop or email. ShuBook 2M also supports all compatible iPhone and iPad models at their native screen resolution, making sure your reading experience is always clear and enjoyable. Plus, the app allows you to auto-reopen the last book you read, starting right where you left off.

For those who enjoy customizing their reading experience, ShuBook 2M offers various customizable layout parameters. You can adjust settings like font family, font size, text alignment, page margins, spacing, and more. You can even import unlimited user font files in TTF format via AirDrop, Dropbox, Safari, or Mail. To enhance your reading, the app provides 16 eye-pleasing color themes and allows for three customizable themes. You have complete control over the background, text, headings, and link colors. Even if it gets dark, you can use Night mode reading and control brightness easily with a vertical swipe, working together with the iOS control center.

Finding content is a breeze with the full text search feature, which automatically saves your recent searches. You can also manage bookmarks without limits for each book, ensuring that you can return to your favorite parts anytime.

ShuBook 2M makes managing your library simple. You can easily handle thousands of books and group them by titles, authors, tags, or clusters. The app allows you to group books hierarchically by authors, allowing for multiple authors per book, and by tags, which can also be multiple. Clusters can be edited, added, or removed, so you can keep your library well-organized. You can search books by title or author and even use an index bar to help you navigate your collection.

Editing book information is straightforward; you can change details like the title, author, tags, and even choose an image for the book cover from your album or online sources.

When it comes to getting books in and out, ShuBook 2M offers convenient access to millions of free ebooks from various sources, including HTML websites and OPDS catalogs. You can even access your Dropbox for added convenience. The app automates TXT encoding detection and performs smart breaks after you download or import TXT files. It also supports downloading tags for books from OPDS catalogs, ensuring everything is organized as you like.

For users with a Calibre library, there's a smart batch download option from Calibre or other OPDS servers on your local network. You can choose to skip books already in your library to avoid clutter. Additionally, ShuBook 2M supports iTunes File Sharing, making it easy to import or export your books. You can also send and receive books via email, a simple and effective way to share your reading materials.

In summary, ShuBook 2M is an excellent choice for anyone looking for a comprehensive, yet easy-to-use book reader and organizer that meets all their reading needs.