Kiroween 2026 Featured Online Build something wicked and git commit to the darkness. $100,000 in prizes Dec 04, 2026 05:00 PM EST to submit 10995 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 32371 participants
Build with Gemini XPRIZE Online $2,000,000 in prizes. Build with Gemini. Ship products that impact the world. $2,000,000 in prizes Winners announced 26393 participants
Midnight Hackathon New York, NY, USA This is your opportunity to build on a fully launched network designed to solve the internet's biggest privacy challenges. Non-monetary prizes Jul 17 – 19, 2026 304 participants
Reddit’s Games with a Hook Hackathon Online Join Reddit and Phaser to build incredible games for the Reddit community! $40,000 in prizes Winners announced 3062 participants
FIND EVIL! by Rob T. Lee Online AI threats strike in minutes. Build the defender that responds in seconds. $22,000 in prizes Winners announced 4387 participants
Reddit Mod Tools and Migrated Apps Hackathon Online Join Reddit to build moderation tools for the Reddit community! $45,000 in prizes Winners announced 3088 participants