Apollo.io

Apollo.io is an all-in-one sales intelligence and engagement platform designed to help B2B sales and marketing teams find, connect with, and close more prospects. At its core, the platform provides access to a database of over 210 million contacts and 35 million companies, enabling users to build highly targeted lead lists using more than 65 filters — including job title, company size, industry, revenue, and location. Beyond data discovery, Apollo.io includes a full engagement suite that supports email sequencing, A/B testing, automated workflows, call tools, and LinkedIn outreach via a Chrome extension, allowing teams to run end-to-end outbound campaigns without switching between multiple tools. The platform also features CRM integrations with Salesforce, HubSpot, and others, as well as intent data and analytics dashboards that help revenue teams prioritize accounts and refine their go-to-market strategies. Apollo.io is best suited for small to mid-sized businesses — with 81% of users coming from small companies — and is particularly popular among sales development representatives, account executives, marketers, founders, and recruiters operating in industries like marketing and advertising, information technology, and SaaS. Whether the goal is scaling outbound prospecting, enriching CRM data, reducing manual research time, or launching personalized multi-touch campaigns, Apollo.io consolidates the entire sales intelligence and engagement workflow into a single, accessible platform.