Apollo.io

Apollo.io is a sales intelligence and engagement platform that combines a database of over 270 million business contacts with AI-powered sales automation tools. Founded in 2015, the company serves over 1 million users and 500,000 organizations, from startups to enterprise sales teams.

Apollo's AI capabilities include lead scoring, email sequence optimization, buying intent signals, and conversational intelligence for sales calls. The platform's AI assistant can draft personalized outreach emails, suggest optimal send times, and identify the highest-probability prospects based on historical conversion patterns. Apollo's data enrichment features automatically update CRM records with verified contact information, job changes, and company signals.

As one of the most widely adopted sales platforms, Apollo represents how AI is transforming B2B sales from manual prospecting to data-driven, AI-assisted engagement — enabling sales teams to focus on relationship-building while AI handles research, prioritization, and initial outreach.