Apollo.io

Apollo.io is a sales intelligence and engagement platform providing access to a database of 275+ million contacts and 60+ million companies with enriched data, email addresses, phone numbers, LinkedIn profiles, job titles, technologies used, and funding history, used by sales teams for prospect identification, list building, and outreach sequencing. The prospecting engine filters the database by virtually any combination of criteria: company size, industry, technology stack, growth signals, funding stage, geography, and job function. Apollo's email sequencing tool automates multi-step outreach to the resulting prospect lists, tracking opens, clicks, and replies and triggering follow-up steps based on engagement. The AI personalization layer generates customized first lines for each prospect based on their LinkedIn activity and company news.

Apollo's data enrichment API populates CRM records with current contact information for leads already in your pipeline. The Chrome extension surfaces Apollo data on any LinkedIn profile, showing verified emails and company information without leaving the platform. Free plans provide limited monthly credits for email lookups and exports. Paid plans start at $49/month per user for the Basic tier.

Apollo is most valuable to outbound-heavy B2B sales teams where contact data quality and enrichment speed are direct levers on prospecting efficiency.