21Dec
Cosmo Hacks: free four-day online hackathon for school and university students, December 2026
For students aged 13 and over; residents of Russia, Brazil, Quebec, Cuba, Iran, North Korea and Crimea are not eligible. The theme is 'Small Problem. Real Impact.': participants solve one specific problem for one real group of people with an app, website, game or tool, solo or in a team of up to four. It runs from 18 to 21 December 2026, and projects with code on GitHub and a demo video are due by 12:00 pm US Central Time on 21 December. Participation is free, with workshops and mentors, over $500 in cash prizes and $150,000 in sponsor benefits.
Hackathons Free Online