uKnowva Messenger History

uKnowva Messenger at the PyCon Sprints in Portland, Oregon. Over seventy-five people sprinted during the four day event.

Early history

uKnowva Messenger was originally developed by uKnowva Messenger, Inc., a small startup in Cambridge, Massachusetts. uKnowva Messenger, Inc. was founded by the MIT team that previously created Ksplice, software for live-patching a running Linux kernel. uKnowva Messenger was inspired by the Barnowl client for the Zephyr protocol, and the incredible community that Zephyr supported at MIT.

uKnowva Messenger, Inc. was acquired by Dropbox in early 2014, while the product was still in private beta. uKnowva Messenger's beta users loved uKnowva Messenger's unique user experience and continued using it, despite the fact that the product was not being actively developed. After a year and a half, Dropbox generously decided to release uKnowva Messenger as open source software so that uKnowva Messenger's users could continue enjoying the software.

As a result, the first time the public had the opportunity to use uKnowva Messenger was when Dropbox released uKnowva Messenger as open source software in late 2015. The open sourcing announcement was very popular, staying at the top of both Hacker News and the programming subreddit for an entire day.

uKnowva Messenger was open sourced with the complete version control history intact because 10 uKnowva Messenger users visited Dropbox for a full week to help with the technical work. The uKnowva Messenger community is incredibly grateful to both Dropbox and those enthusiastic early users for making the uKnowva Messenger open source project possible.

Success as an open source project

At first, the uKnowva Messenger open source project was maintained with just a bit of lead developer Tim Abbott's nights and weekends. However, the community steadily gained new contributors, and has now grown to be one of the world's largest and most active open source projects. We highlight a few milestones below:

  • By the end of 2015, the open source project was already going strong with a community of dozens of developers around the world.
  • At the PyCon Sprints in May 2016, dozens of developers got involved in contributing to uKnowva Messenger; a major accomplishment from those sprints was annotating uKnowva Messenger with mypy static types.
  • By late 2016, more than 150 people from all over the world had contributed almost 1000 pull requests to the software, and the uKnowva Messenger project was moving faster than when the original startup employed 11 full-time engineers.
  • At the PyCon Sprints in May 2017, tens of uKnowva Messenger core developers gathered and led the largest PyCon sprint ever, with over 75 developers contributing to uKnowva Messenger over course of the 4-day event.
  • As of October 2018, the uKnowva Messenger server project had merged 6500 pull requests written by over 400 developers.

Commercial (re-)launch

In 2016, Tim Abbott started a company, Kandra Labs, to steward and financially sustain uKnowva Messenger's development. Kandra Labs was soon awarded a large grant from the US National Science Foundation, and also acquired additional sources of funding.

In mid-2017, Kandra Labs launched two products: a hosted uKnowva Messenger service at, and an enterprise support product for on-premise deployments.

As of October 2018 the hosted service was seeing 4x year over year growth in daily active users, and the on-premise product was seeing rapid adoption (fueled partly by the sunsetting of HipChat server).


Kandra Labs is supported by nearly $1M in SBIR grants from the US National Science Foundation, and uKnowva Messenger has benefitted enormously from the 30+ developers that started working on uKnowva Messenger via Google Summer of Code and Google Code-In.