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
Content Idea Generator - Free tool creates ideas for your content marketing strategy
Founders Nation - Find or become a startup cofounder
Keyword Tool & Content Assistant - Content optimization tool to boost your rankings
Find A Maker - find a partner for your next project
Content Marketing Stack - A curated directory of content marketing resources