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MarsEdit is a Mac desktop app for blogging, supporting posting to several blog platforms including WordPress, Tumblr, and

MarsEdit started as a blog posting feature in NetNewsWire by Brent Simmons. It was then expanded and moved into a standalone app. Daniel Jalkut of Red Sweater Software acquired the app in 2007 and he is still the current developer. Daniel blogs about MarsEdit at:

MarsEdit can download posts, create new posts, edit and delete posts, and upload files. It works with most popular blogging software including Blogger, Movable Type, Tumblr, WordPress, and It supports 3 very different APIs:

  • MetaWeblog XML-RPC API (with flavors for the original Blogger API, Movable Type API, and the WordPress API)
  • AtomPub API (used for Google's Blogger)
  • Tumblr API (custom JSON-based API)

MarsEdit will auto-discover the API type and endpoint using Really Simple Discovery (RSD):

MarsEdit does not currently support the Micropub API. At IndieWebCamp Austin 2017, the MicroPub Life Cycle session discussed improvements to Micropub specifically with an app like MarsEdit in mind.