Stupid Ideas Hackathon (Ottawa F26) Ottawa, Canada build something stupid! $CAD 1,252 in prizes Nov 15, 2026 89 participants
PayPal AI Hackathon Online Build what’s next with PayPal and AI $67,500 in prizes Nov 12, 2026 03:00 PM EST to submit 23569 participants
Cal Hacks 13.0 San Francisco, CA, USA This year's Cal Hacks is presented by Anthropic, Annapurna Labs, Spacetime, and Hyphenate! Together we'll assemble in SF for a weekend of hacking, friendship, and crazy ideas. $159,822 in prizes Oct 23 – 25, 2026 1917 participants
ImpactForge Online Every great change started with someone who decided to build it. Join ImpactForge and forge the tools, apps, and ideas the world actually needs. $300 in prizes Winners announced 979 participants
Build Beyond Hackathon Online Build beyond the ordinary. Turn your ideas into real projects, collaborate with innovators, and create solutions that shape the future. Non-monetary prizes Winners announced 1343 participants