Reddit’s Game of the Day Hackathon Online Join Reddit to build incredible daily games! $35,000 in prizes Dec 08, 2026 09:00 PM EST to submit 1229 participants
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 14040 participants
PayPal AI Hackathon Online Build what’s next with PayPal and AI $67,500 in prizes Winners TBD 35826 participants
RevenueCat Shipaton 2026 Online Ship apps and start making money. $740,000 in prizes Winners announced 28557 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 26387 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
Slack Agent Builder Challenge Online Whether it's your first agent or your fiftieth - Slack is where it ships. $42,000 in prizes Winners announced 4404 participants
UiPath AgentHack Online Build the AI agents of tomorrow. $50,000 in prizes Winners announced 3997 participants
Splunk Agentic Ops Hackathon Online Reimagine the future of agentic operations using Splunk AI $20,000 in prizes Winners announced 2352 participants
Claude Builders Club Hackathon @ ALU Kigali, Rwanda Build AI solutions for real-world impact. Inspired by Dario Amodei's "Machines of Loving Grace" - 5 tracks, 4 days, 1 Demo Day. Non-monetary prizes May 23 – 28, 2026 104 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
Build with MeDo Hackathon Online Build creative applications with MeDo, no coding required. Push the boundaries of what you can create. $50,000 in prizes Winners announced 8334 participants
Global Challenge 2017 $10 Million Dollar Global Pop-Up Application Challenge Non-monetary prizes Jan 20 – 21, 2017 26 participants