"A super small group of developers and I got together to design and build a new inteal tool and saw an opportunity to do something more. Through that process, we saw ourselves build something much more substantial than another inteal tool. Months later, we ended up with an early version of Bootstrap as a way to document and share common design pattes and assets within the company."
After a few months of development by a small group, many developers at Twitter began to contribute to the project as a part of Hack Week, a hackathon-style week for the Twitter's development team. It was renamed from Twitter Blueprint to Bootstrap, and released as an open source project on August 19, 2011. It has continued to be maintained by Mark Otto, Jacob Thoton, and a small group of core developers, as well as a large community of contributors.
On January 31, 2012, Bootstrap 2 was announced. This release added the twelve-column grid layout and responsive design components, as well as changes to many of the existing components. The Bootstrap 3 release was announced on 19 August, 2013, moving to a mobile first approach and using a flat design.
On October 29, 2014, Mark Otto announced Bootstrap 4 was in development. The first alpha version of Bootstrap 4 was deployed on August 19, 2015.
