一款设计精良、布局清晰、易于使用的 PDF 阅读软件，并可做详尽注释，比如下划线、个人签名等等。软件还可以同时打开多个文件，并可个性化定制工具栏，大大提高了阅读效率，还可轻松与 PC 和 Mac 同步文件。

Features: 
- A complete annotation system: Text Notes, Highlight, Underline, Free-Form Drawing, Bookmarks, and more. An intuitive interface allows for viewing and editing annotations without leaving the document reading view. 
- Full-featured PDF reader: Continuous-scrolling page display with all standard scroll/zoom gestures supported, and full screen reading mode. Edit mode now supports two-finger scrolling. 
- Easy transfer of PDFs: Send and receive PDFs via email, Dropbox, through iTunes sync, by browsing to any PDF link, or using our free desktop transfer software.
- Tabbed PDF Reading: Quickly switch between multiple open documents. Tab setup and page locations are always remembered, whether switching tabs or quitting and returning to the app. 
- Fully Customizable Toolbars: Reposition and resize toolbars, and drag-and-drop to configure tools included on each. 
- Comprehensive PDF support: Copy-and-paste text, view existing PDF annotations, support for internal and URL links, and PDF outline/bookmarks support. Fully integrates annotations directly into the PDF. 
- Document and full-library search: Search your entire PDF library to instantly find all documents with any keyword. Tabs sort new, recent, unread, and annotated documents.
- VGA output: Use the iPad VGA dock connector to display your documents onto an external projector or monitor. Your document view, along with all annotations and popup displays, is mirrored as you navigate and annotate the document. You can also reference documents in other tabs on your iPad, without affecting the presented display.
- APS (Aji PDF Service): Free companion desktop application for easy sync with your existing desktop PDF collection. Recommended for large libraries of documents. 
- Aji Support: integrated application help and tips, and top-notch email and forum support.

版本 3.1.8 中的新功能

- Fixes problem with choppy scrolling in some situations