Apollo.io is an AI-powered sales intelligence and engagement platform that helps B2B revenue teams find and engage leads, automate outreach, manage deals, and enrich CRM data in a single workspace. At its core is a continuously updated B2B database of more than 210 million contacts and 35 million companies, paired with advanced search, intent data, and workflow automation so teams can build pipeline faster and with more precision.
Beyond data, Apollo.io includes a full sales engagement suite. Users can run multi-step sequences across email, phone, and LinkedIn, leverage an integrated dialer with call recording, book meetings, and track engagement in real time. The Chrome extension lets reps prospect directly from LinkedIn, Gmail, Salesforce, HubSpot, and company websites, while Apollo’s AI features generate personalized emails, score leads, surface buying signals, and provide conversation insights from calls and meetings.
Founded in 2015 and backed by investors including Y Combinator, Sequoia Capital, Tribe Capital, Nexus Venture Partners, and Bain Capital Ventures, Apollo.io has raised roughly $251M across multiple rounds and reached a $1.6B valuation. The company reports 150M+ ARR, serves 40,000+ paying customers and 500,000+ companies globally, and has accumulated more than 9,000 G2 reviews with an average rating around 4.7/5, making it one of the most-reviewed products in the Sales Intelligence category.
Positioned between traditional data vendors like ZoomInfo and stand-alone engagement tools like Salesloft or Outreach, Apollo.io differentiates with a product-led, freemium motion and an all-in-one platform that is especially attractive to small and midsize B2B teams. Its combination of broad data coverage, embedded AI, and relatively aggressive pricing has made it a popular choice for organizations looking to consolidate their go-to-market stack without sacrificing functionality.
