We verified 100,000 Apollo contacts with BounceZero to measure real-world email accuracy. Here is what the data shows - and what it means for your outreach strategy.
100,000 contacts exported between Jan-Jun 2026, verified immediately. Full methodology
Apollo has over 275 million contacts and 73 million company profiles. At $49-$99/month, the database-to-cost ratio is unmatched in the market. ZoomInfo offers similar data volume at 10-20x the price. For startups and SMBs who need scale without enterprise budgets, Apollo is the clear choice.
Apollo search filters are comprehensive: job title, seniority level, company size, industry, geography, technology stack, intent signals, funding stage, headcount growth, and more. The ability to layer 10+ filters simultaneously lets you build highly targeted segments that would require custom database queries elsewhere.
Apollo tracks intent signals - content consumption, G2 page visits, job postings - and surfaces them in contact records. For SDR teams running account-based plays, knowing which companies are actively researching solutions in your category is a significant efficiency multiplier.
Apollo includes a native email sequencing tool, removing the need for a separate cold email platform for teams with modest volume needs. The sequences are not as sophisticated as Instantly or Smartlead for high-volume agency use, but they are adequate for most internal SDR workflows.
Apollo free gives 10 email credits and 5 mobile number exports per month - enough to validate the product before committing. The upgrade path is straightforward and pricing is transparent.
This is the central issue with Apollo data. In our 100,000-contact test, only 73.2% of addresses were deliverable via SMTP. The remainder were catch-all (18.4%), invalid (5.8%), or role-based/disposable (2.6%). Sending to an unverified Apollo list guarantees bounce rates well above ISP thresholds. This is not a criticism unique to Apollo - all B2B data providers have accuracy gaps. It is the cost of building a 275M-contact database with automated data collection. The fix is straightforward: verify with BounceZero before every export hits a sending domain.
Phone number accuracy in Apollo is noticeably weaker than email. Mobile numbers are particularly unreliable - significant portions are outdated, work numbers that no longer connect, or simply wrong. Teams building SDR call workflows should plan for higher qualification overhead on Apollo phone data versus a dedicated phone data provider like Cognism.
Apollo sequences handle single-sender outreach well. They are not designed for the multi-sender inbox rotation, account-level sending limits, and deliverability monitoring that agency cold email workflows require. Teams doing high-volume outreach for multiple clients should use Apollo for prospecting and a dedicated tool (Instantly, Smartlead) for sending.
Exporting large Apollo searches occasionally produces duplicate contacts - same person appearing under slightly different company names or titles. At modest volumes this is manageable; at 50,000+ contact exports it creates list management overhead that requires deduplication before import.
* Add BounceZero verification at $3/1,000 contacts. Professional plan users on Apollo exporting 10,000 contacts/month: total cost including verification = $99 + $30 = $129/month for a clean, verified B2B prospecting stack.
Apollo gives you the best contact database at the best price. BounceZero closes the 27% accuracy gap before any email reaches a sending domain. Together, they produce the most cost-effective verified B2B prospecting stack available in 2026.
Apollo, ZoomInfo, Lusha and Cognism all have accuracy gaps - verify exports before sending
8 methods ranked by accuracy - Apollo, Hunter, Clay, pattern guessing
What email appending is, B2B vs B2C append, 6-step workflow, GDPR risk table, match rates, alternatives
7 cheaper prospecting tools: Apollo, Cognism, ZoomInfo, Hunter, Kaspr, FindyMail, Clay - pricing + fit
7 cheaper tools: Apollo, Cognism, Hunter, Kaspr, Lusha, Clay - pricing, GDPR, intent data comparison
7 tools: Cognism, ZoomInfo, Hunter, Kaspr, Lusha, FindyMail, Clay - EU GDPR gaps, accuracy, pricing
6 tools: Apollo, Hunter, Kaspr, Cognism, Lusha, Snov.io - accuracy comparison, pricing, free tier
Continue through related topics