SprintSignal

SprintSignal is a planning poker application that enables developers to easily evaluate and estimate complexity of sprint stories. SprintSignal browser extensions makes importing stories from platforms like JIRA a breeze. The process is very simple: just open any page on JIRA or other supported platform that contains stories, click on the SprintSignal extension icon in your toolbar, and click Import button to create a new SprintSignal session.

Screenshots from Chrome Web Store