Based on our record, Y Combinator Co-founder Matching seems to be more popular. It has been mentiond 1 time since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
One idea I just remembered is to find a business co-founder that already knows a market well and sees an opportunity. Startup School's co-founder matching service is quite good. Source: almost 3 years ago
CoFoundersLab - Meet 250,000+ entrepreneurs online
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
Founders Nation - Find or become a startup cofounder
pretix - pretix helps you to sell tickets for your event in an easy way. It supports multi-lingual events and provides a wide range of features
Find A Maker - find a partner for your next project
Ticket Tribe - Sell tickets online with no fees per ticket