Apollo.io

Leading sales intelligence platform competing with ZoomInfo and LinkedIn Sales Navigator, known for integrated data and engagement capabilities

Apollo.io is a sales intelligence and engagement platform that combines a B2B database of over 275 million contacts and 73 million companies with sales engagement tools. Founded in 2015, the company provides end-to-end solutions for prospecting, outreach, and deal management, enabling sales and marketing teams to identify ideal customers, engage them through multiple channels, and track interactions throughout the sales cycle. While not strictly an AdTech company, Apollo operates in the adjacent MarTech and sales technology space, providing data and engagement capabilities that support go-to-market strategies. Apollo.io has established itself as a significant player in the sales intelligence market, competing with established vendors like ZoomInfo, LinkedIn Sales Navigator, and Outreach. The platform differentiates itself by offering an integrated solution that combines data intelligence with engagement tools at competitive pricing, making it accessible to both SMBs and enterprise customers. The company has experienced rapid growth and is backed by notable investors including Tribe Capital, Nexus Venture Partners, and Y Combinator.