Apollo.io
B2B sales intelligence platform — 270M+ verified contacts, AI email writer, and multi-channel engagement
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About Apollo.io
Apollo.io is an all-in-one B2B sales intelligence and engagement platform that combines a massive contact database with outreach automation, CRM, and AI writing tools. Founded in 2015 by Tim Zheng, Ray Li, and Michael Medvinsky, Apollo has grown to serve 600,000+ companies including Autodesk, Gong, Stripe, and Databricks with a 270M+ verified contact database and intent data signals.
Apollo's database is its primary differentiator: 270M+ contacts with verified email addresses, direct phone numbers, LinkedIn profiles, company technographics, funding data, and real-time job change alerts. This data fuels precise prospecting — users can filter by company size, industry, technology stack, funding stage, location, job title, and dozens of other criteria. The AI email writer generates personalized outreach from prospect data, and the sequencer handles multi-step email and LinkedIn outreach with A/B testing and conditional logic. Apollo's generous free plan (unlimited email credits for verified contacts, 50 mobile numbers/month) makes it the most accessible prospecting database on the market. 600K+ companies using the free plan alone demonstrates Apollo's market penetration.
Key Features
- 270M+ contact database — verified emails, direct dials, LinkedIn profiles, and company intelligence for B2B prospecting
- AI email writer — generate personalized outreach emails from prospect data, company context, and your value proposition
- Intent signals — identify companies actively researching topics relevant to your product for prioritized outreach timing
- Multi-channel sequencer — automated email + LinkedIn sequences with conditional logic, A/B testing, and scheduling
- CRM integration — native bi-directional sync with Salesforce, HubSpot, and other CRMs for seamless pipeline management
- Job change alerts — get notified when contacts change jobs so you can reach champions who've moved to new companies
- Apollo Dialer — built-in power dialer for call-based outreach directly from prospect profiles
- Chrome extension — find contact details on LinkedIn, company websites, and other web pages without leaving the browser
Pros
- The most generous free plan in B2B prospecting — unlimited email credits and verified contacts at no cost
- 600,000+ companies using Apollo validate it as the most widely adopted B2B sales intelligence platform
- 270M+ contact database with intent signals is the most comprehensive prospecting database outside enterprise tools like Demandbase
- All-in-one platform eliminates separate subscriptions for a prospecting database, sequencer, dialer, and CRM
- AI email writer generates highly personalized outreach from prospect data without manual research
- Chrome extension works seamlessly on LinkedIn for one-click contact export and enrichment
Cons
- Per-seat pricing on paid plans ($49-99/user/month) adds up quickly for large sales teams vs flat-fee tools like Instantly
- Database accuracy varies — direct dials particularly have lower accuracy than email addresses (requires verification workflow)
- Email deliverability on Apollo's sending infrastructure is lower than dedicated tools like Instantly or Smartlead for high-volume senders
- Free plan limits on mobile numbers (50/month) and export credits frustrate teams needing high volumes at no cost
- Sequencer is less customizable than Smartlead for advanced behavioral branching and multi-domain rotation
- Intent data accuracy and coverage is narrower than enterprise ABM platforms like 6sense or Demandbase
Pricing
Free: unlimited email credits, 50 mobile credits/month, basic filters, 250 email sends/day, 1 mailbox. Basic ($49/user/month): 12,000 email credits, 300 mobile/month, A/B testing, CRM sync. Professional ($79/user/month): 24,000 credits, 600 mobile, AI email writing, custom fields, advanced filters. Organization ($119/user/month): unlimited credits, intent data, SSO, advanced admin. Annual billing saves ~20%.
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Frequently Asked Questions
Yes. Apollo has a free plan with unlimited email credits (verified contacts from the database), 50 mobile credits/month, 250 email sends/day from their sequencer, basic filters, and CRM integration. It's the most generous free B2B prospecting database available. Paid plans add more mobile credits, AI features, advanced filters, and higher sending limits.
Apollo provides the prospecting database (270M+ contacts) + sequencer + dialer + CRM in one tool. Instantly and Smartlead are pure sending infrastructure — no database. The recommended stack for scaling teams is Apollo (data) + Instantly or Smartlead (sending) for the best deliverability with the best data.
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