The 2021 CERN Webfest took place on the weekend of 21-22 August. The Webfest is CERN’s annual hackathon based on open web technologies. 300 people signed up for this year’s event, which was held online for only the second time. The participants — from 63 countries spread across the globe — formed into small teams and used their combined skills and knowledge to develop innovative prototype apps, hardware, and other tools.