Apollo vs ZoomInfo for B2B Prospect List Building — Which Is Better

Apollo and ZoomInfo are the two dominant B2B contact databases used for cold email prospect list building. Both provide searchable databases of company and contact records filtered by job title, seniority, company size, industry, geography, and technology. The right choice depends on your target market, required data depth, and budget.

Apollo's Advantages

Apollo's 275+ million contact database covers a broad range of company sizes and industries with strong SMB and mid-market coverage. Its pricing is significantly lower than ZoomInfo — Apollo's basic plans start at a fraction of ZoomInfo's cost — making it accessible for early-stage sales teams and agencies. Apollo also includes a built-in email sequencing tool, intent signals, and a Chrome extension for LinkedIn prospecting. For companies targeting sub-500 employee companies across a broad range of industries, Apollo's coverage and price-to-quality ratio is strong. See a live example of Apollo-powered prospecting in the Meta Ad Library Lead Qualifier demo.

ZoomInfo's Advantages

ZoomInfo's enterprise-grade contact and company data is significantly deeper for large enterprise accounts — Fortune 500 companies, public companies, and mid-market firms with over 500 employees. ZoomInfo's Intent data is more mature than Apollo's, identifying companies actively researching specific topics based on web behavior signals. For companies selling enterprise deals where data accuracy on C-suite contacts at large companies is critical, ZoomInfo's data quality justifies the premium price.

How Omni Uses Both

Omni uses Apollo as the primary prospecting source for most campaigns and supplements with ZoomInfo for enterprise-focused clients targeting large accounts. Clay's waterfall enrichment layer sits on top of both to fill coverage gaps. The full prospecting stack is described in the cold outbound system.