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Skim is described as 'PDF viewer and annotation tool for macOS supports scientific paper reading, note-taking, highlighting, bookmarks, multiple annotation types, and AppleScript' and is a popular PDF Reader in the office & productivity category. There are more than 100 alternatives to Skim for a variety of platforms, including Windows, Mac, Android, Linux and iPhone apps. The best Skim alternative is SumatraPDF, which is both free and Open Source. Other great apps like Skim are Okular, Foxit PDF Reader, Xournal++ and Evince.
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Redact & Annotate images. Hide or mark up essential parts of your image by simply clicking and dragging on it.


Shelf is a convergent document viewer that supports PDF and EPUB files. With Shelf, you can organize your document collection by creating tags, like other Maui applications.







Comprehensive PDF tool for viewing, editing, annotations, and conversion between formats like Word, Excel, or PPT. Features include encryption, redaction, and fast batch processing.




Xreader is a document viewer capable of displaying multiple and single page document formats like PDF and Postscript.
xnotes is a handwriting-first notebook for phones and tablets, built for pen and stylus. Write, sketch and annotate with pressure-sensitive, variable-width ink, and nothing you draw is ever flattened.




PDF Reader Air is the ideal app for anyone who works with PDFs in the office or at home. Optimizing your work quality and productivity couldn’t be easier!.




FormulatePro helps you open and write on PDF documents. You can fill out any PDF form document, drop in graphics, scribble with the mouse or a tablet, save and print.

Professional PDF tools without the cloud. 100% offline, native performance, and zero data collection. Your documents stay where they belong: on your device.






