Mailshake is a web-based email outreach platform designed to help small businesses, marketers, and entrepreneurs reach out to potential leads and customers. Apollo is an entirely different kind of tool. It is an AI-powered tool that suggests relevant influencers, content, and solutions for marketing teams. It also provides deep analytics to measure the effectiveness of campaigns and messaging. Mailshake is focused on helping businesses reach out to potential customers through effective email strategies, while Apollo is geared towards helping marketers discover the best influencers, content, and solutions for their campaigns.