Reesio is Slack plus Salesforce for the 2.5M residential real estate brokers and agents in the United States. The biggest pain point facing real estate professionals right now is that all of the technologies that exist out there to help them do their jobs are antiquated, fragmented, and clunky. There doesn't exist just "one system" that does everything -- CRM, Transaction Management, Marketing, etc. Check out this story about a research study conducted with brokerages, highlighting just how big of a problem this is:
Reesio solves for this pain point by providing a beautiful product that combines all of these fragmented products into ONE product, which allows brokers and agents to manage every aspect of their job in one place. Brokers and Agents combine to spend $10B per year on fragmented tools that don't work. It's a huge market.