Polymer Developer(s) Google[1] and contributors[2] Initial release May 29, 2015 (2015-05-29)[3] Stable release 2.0.2, 1.9.3 / July 24, 2017 (2017-07-24)[4], July 20, 2017 (2017-07-20)[5] Preview release 3.0[6] / August 22, 2017 (2017-08-22) Repository https://github.com/Polymer/polymer Development status Active Written in JavaScript, HTML Type JavaScript library License 3-Clause BSD[7] Website www.polymer-project.org