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Developer(s)Red Sweater Software
Stable release
4.4.13 / May 6, 2021
Operating systemMac OS X
TypeBlog client

MarsEdit is a weblog editor for Mac OS X. It supports posting to many popular blogging services, such as Blogger, Movable Type, Tumblr, and WordPress.


MarsEdit was originally developed as a component of NetNewsWire, a popular news aggregator for Mac OS X, which, in the 1.0 series, included a simple weblog editor. During the development of NetNewsWire 2.0, the developers decided to move the blog editor functionality to a new application.[1] The resulting application, MarsEdit 1.0, was released on December 10, 2004.[2]

With the acquisition of NetNewsWire by NewsGator in 2005, the future of MarsEdit was uncertain for a time. On November 4 of 2005, it was revealed that MarsEdit development would be continued by Gus Mueller of Flying Meat.[3] In February 2007, MarsEdit was purchased by Red Sweater Software, and is developed by Red Sweater's owner, Daniel Jalkut.[4]

  • MarsEdit 2.0 was released in September 2007, with a refined user interface and several new features including Flickr integration.[5]
    • MarsEdit 2.3 was released in March 2009 and includes support for the popular Tumblr blog service.[5]
  • MarsEdit 3.0 was released in May 2010 and includes WYSIWYG editing, enhanced WordPress support, and image library integration.[6]
  • MarsEdit 4.0[7]
    • MarsEdit 4.5[8]


  • Bookmarklets for sending a page from your browser to MarsEdit
  • Image and file uploading
  • Preview templates
  • Spell checking
  • Custom tags
  • Sends updates notices to, Technorati, and
  • AppleScript support
  • XML-RPC console for debugging server problems


  1. ^ Cohen, Peter. "Ranchero offers MarsEdit, NetNewsWire 2.0 beta". Macworld. Macworld. Retrieved 29 May 2022.
  2. ^ Simmons, Brent. "inessential: MarsEdit 1.0 ships!". Retrieved 29 May 2022.
  3. ^ Brent Simmons. "Meet the new MarsEdit Programmer".
  4. ^ "Red Sweater Acquires MarsEdit Blogging Software". Retrieved 29 May 2022.
  5. ^ a b "MarsEdit 2 - Powerful Blog Publishing For Your Mac".
  6. ^ "What's New In MarsEdit 3?". Retrieved 2022-01-06.
  7. ^ "MarsEdit 4 - What's New?". 2020-10-19. Archived from the original on 19 October 2020. Retrieved 2022-01-06.
  8. ^ "MarsEdit - What's New?". Retrieved 2022-01-06.

External links[edit]