Skim (software)

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Developer(s)Christiaan Hofman, Adam Maxwell, and Michael McCracken
Stable release
1.5.5[1] / November 25, 2019; 59 days ago (2019-11-25)
Repository Edit this at Wikidata
Written inObjective-C
Operating systemMac OS X
Available inMultilingual
TypePDF reader

Skim is an open-source PDF reader. It is notably the first free software PDF reader for Mac OS X.[2] It is written in Objective-C, and uses Cocoa APIs. It is released under a BSD license. It is also cited as being able to help annotate and read scientific papers.[3]


Its initial release was in April 2007, at version 0.2.[4] Within its first year it managed to gain a small fan base of users due to its ease of use and features which allowed some flexibility over other PDF browsers for Mac OS X. As of 2008 it had achieved version 1.0. Its main developers were also responsible for another popular open-source program, BibDesk.[5]


Some of its features include the ability to view and bookmark PDFs, highlight and underline selectable PDF text, and a full-screen and presentation mode. It also allows the adding of circles and boxes, as well as being able to embed and edit notes.[6]

See also[edit]


  1. ^
  2. ^ Pash, Adam (April 4, 2007). "Download of the Day: Skim (Mac)". Lifehacker. Retrieved November 6, 2017.
  3. ^ "Open Source on Mac". No Thick Manuals. Archived from the original on June 12, 2007. Retrieved November 6, 2017.
  4. ^ Lu, Mat (April 2, 2007). "Skim PDF reader". Engadget. Retrieved November 6, 2017.
  5. ^ McCracken, Michael (April 2, 2007). "Announcing Skim: Stop printing – Start Skimming". Archived from the original on October 11, 2007. Retrieved November 6, 2017.
  6. ^ Mckee, Michael (October 7, 2007). "Skim – A better PDF reader". Mac the Web. Archived from the original on October 13, 2007. Retrieved November 6, 2017.

External links[edit]