类似的系统有很多：doPDF，PDF-XChange Viewer Pro V2.056.0 翠绿色汉语免注册安卓版 ，Adobe PDF 复印机 7.0 ，这几条全是有中文版的，比本手机软件功能强大多了。
PDF Reader: Drop support to open PDFs
PDF files can now be dragged into the PDF Reader to open them. This simplifies opening PDFs in certain situations.
PDF Reader: Word selection by double click
You already know this from other PDF readers: Select a word by double-clicking it. This feature is now also available in PDF24 Reader.
PDF Reader: Language selection improved
In the last versions the language selection in the PDF24 Reader was not as we would like it to be and there were occasional problems with the choice of the correct language file. Here we optimized and solved problems.
PDF Reader: Annotations are now visible
Previous versions did not display annotations in PDF. In this version, the annotations are now displayed.
PDF Reader: Improved image scaling for icons
The image scaling mode for toolbar icons and mouse pointers is now BICUBIC. This results in better image quality on different screens.
PDF Reader: Smaller Info-Bar Close Icon
On some screens the close icon of the info bar was a bit too big, which was due to problems with scaling with different DPI levels. This has been improved. The icon is now the same size on all screens.
PDF Reader: Text selection improved
The text selection algorithm has been improved for a better user experience. More and better heuristics are used to improve the text selection compared to before.
PDF Reader: Nicer cursor images
We did not like some cursor pictures yet and now we have more beautiful pictures in use.
PDF Reader: Zoom scroll behavior improved
The zoom scroll behavior has also been improved. For better usability, the X-axis is now scrolled automatically when zooming. This means that manual readjustment is now less necessary.
Updater: Minor enhancements
We have made minor improvements to the Updater to be more selective in the delivery and selection of updates. This gives us more leeway with the update distribution.