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“4.3?” roared David Karp across the boardroom table. He spun on his heels, turning his back to the board. His shoulder muscles rippled through his gingham shirt.

“4.3? We can do better than that. We HAVE to do better than that.”

The boardroom broke into murmurs. They had done everything right with 4.3. The entire company, top to bottom, had signed off on it. The research was there. It was focus-grouped for ten months straight. It was a sure-fire hit.

An executive VP piped up. “But, David, 4.3 is the most market-tested product we’ve ever released! The approval numbers are off the charts!”

David’s hand came smashing down on the luxurious mahogany slab. Glasses rattled. A ballpoint pen was sent flying. “I don’t give a darn about the numbers! What happened to doing something because you gave a flying flip about it? What happened to the passion? Numbers? The others guys can have numbers. We’ve gotta have passion, or we’re not worth the CD-ROMs we’re printed on. Passion. That’s what it’s all about. That’s why we’re all here.” David gestured behind him, toward the plate-glass window, the Manhattan skyline sparkling beyond. “We do it for them. For the common man. The common man needs Tumblr now more than ever.”

He spun again, now facing outward onto the city he loved. From every street rose a memory. Lexington Avenue, where he learned to ride a bike, and where he got his first broken arm (Maury, who owned the bagel store, came running out when it happened. Good old Maury). Bleecker Street, where he got his first kiss, and saw his first real rock ’n roll show. The Velvet Underground. A sound so raw and real it could only come out of NYC. Finally, he looked down directly onto the street below. The street on which he’d built his business…no, not his business—his dreams. Below was a street on which the creative passions of millions of users had stacked up into a four-hundred-thirty-one-story skyscraper that housed the collective energy of Tumblr.

David Karp pressed his nose against the glass and looked deep down into the canyon of 431st Street. Four-three-one. That’s when it hit him.

“Four-three-one. That’s it. Version 4.3.1. That’s what we’ve gotta do. Version 4.3.1 of the Tumblr app for iOS.”
Silence fell over the board room. The air around the one-of-a-kind, designer table was thick with uncertainty.

Then came the sound, ringing out like a shot. It was a handclap. The executive VP has risen to his feet. Another handclap erupted from his palms. His muscular, deliberate applause electrified the room.

The next thing David knew, the entire board was on its feet. Clapping, stomping, hollering. The sound was thunderous, deafening. This was it. This was why he had followed his dream in the first place. This...

This was 4.3.1.

App Description

Post whatever you want to your Tumblr. Follow other people who are doing the same. You’ll probably never be bored again.

• Post anything: Photos, GIFs, videos, quotes, chats, links, text—like we said, pretty much whatever.
• Make one blog or tons of blogs. Whatever ideas you have, Tumblr is your place to put them.
• Customize those blogs to look as beautiful or as weird as you want.
• Interact with other people on Tumblr by reblogging their posts. Experience the thrill of seeing your own posts reblogged by other people.
• Send fan mail, asks, and submissions to the blogs you love.
• Have fun. Finally.

iPhone Screenshots

(click to enlarge)

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iPad Screenshots

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App Changes

  • June 30, 2011 New version 2.0
  • August 04, 2011 New version 2.0.1
  • August 18, 2011 New version 2.0.2
  • November 14, 2011 New version 2.0.3
  • December 06, 2011 New version 2.0.4
  • January 23, 2012 New version 2.0.5
  • June 21, 2012 New version 3.0.0
  • September 06, 2012 New version 3.1.0
  • September 20, 2012 New version 3.1.1
  • October 01, 2012 New version 3.1.2
  • November 08, 2012 New version 3.2
  • November 10, 2012 New version 3.2.1
  • December 03, 2012 New version 3.2.2
  • December 20, 2012 New version 3.2.3
  • January 30, 2013 New version 3.2.4
  • March 11, 2013 New version 3.3
  • April 24, 2013 New version 3.3.1
  • May 20, 2013 New version 3.3.2
  • July 09, 2013 New version 3.4
  • July 17, 2013 New version 3.4.1
  • August 05, 2013 New version 3.4.2
  • September 19, 2013 New version 3.4.3
  • November 20, 2013 New version 3.5
  • December 16, 2013 New version 3.5.1
  • January 02, 2014 New version 3.5.2
  • January 28, 2014 New version 3.5.3
  • February 04, 2014 New version 3.5.4
  • February 24, 2014 New version 3.5.5
  • February 24, 2014 New version 3.5.6
  • May 06, 2014 New version 3.6
  • May 28, 2014 New version 3.6.1
  • August 27, 2014 New version 3.6.2
  • August 31, 2014 New version 3.6.3
  • September 18, 2014 New version 3.7
  • October 25, 2014 New version 3.7.1
  • November 06, 2014 New version 3.7.2
  • November 24, 2014 New version 3.7.3
  • December 16, 2014 New version 3.7.4
  • December 19, 2014 New version 3.7.5
  • January 29, 2015 New version 3.8
  • January 30, 2015 New version 3.8.1
  • February 14, 2015 New version 3.8.2
  • March 28, 2015 New version 3.8.3
  • April 15, 2015 New version 4.0
  • April 16, 2015 New version 4.0.1
  • April 30, 2015 New version 4.0.2
  • June 01, 2015 New version 4.1
  • June 19, 2015 New version 4.1.1
  • June 30, 2015 New version 4.2
  • August 17, 2015 New version 4.3.1