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Apollo.io

Apollo.io is the all-in-one AI sales intelligence platform with 275M+ verified B2B contacts, built-in email sequencer, intent data, and AI-powered personalization. Free plan available.
9.1 /10
(6,700+ Reviews)
From $49/mo
Company: Apollo.io, Inc.
Founded Year: 2015
Location: San Francisco, CA
  • AI-Powered, API Available
  • Free Trial Available, Paid (Subscription)
  • E-Commerce, SaaS/Tech
  • Enterprise, SMB
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About Apollo.io

Apollo.io is the most complete all-in-one B2B sales intelligence and engagement platform, combining the world’s largest verified contact database (275 million+ contacts, 73 million companies) with AI-powered outreach tools in a single platform. For sales teams that want to find prospects, research them, reach out, and track engagement without stitching together multiple tools, Apollo is the most practical and cost-effective solution available.   Apollo’s database is filtered by 65+ attributes including job title, seniority, company size, industry, revenue, technology stack, funding stage, geography, and growth rate. This allows highly precise audience targeting that reduces wasted outreach and increases conversion rates. The AI layer adds intent data (identifies companies actively researching your product category), AI email writing (personalized outreach at scale), and predictive lead recommendations (AI suggests leads similar to your best customers).   Apollo.io Key AI Features:
  • 275M+ Verified Contact Database: Filter contacts by 65+ attributes. Verified email addresses with bounce protection. Mobile number access on paid plans. Company technographic data showing what software they use.
  • AI Email Assistant: Generates personalized outreach emails using prospect data. Write a template with variables and Apollo personalizes each email individually — industry-appropriate language, role-specific pain points, relevant social proof.
  • Intent Data: Identifies companies researching topics related to your product right now. If your target companies are searching for ‘CRM software comparison’ or visiting your competitor’s pricing page, Apollo flags them as high-intent and surfaces them at the top of your prospecting list.
  • Sequences: Multi-step automated outreach combining emails, LinkedIn touches, phone call reminders, and tasks. AI recommends optimal timing between steps based on response patterns from similar prospects.
  • AI Recommendations: Machine learning analyzes your historical won deals and recommends the leads in the database most similar to your best customers. Updated continuously as you close more deals.
  Apollo Pricing: Free: 50 email credits/month, 5 mobile credits, 2 sequences. Basic: $49/user/month — 1,000 email credits, 10 mobile credits, unlimited sequences, AI email writer. Professional: $79/user/month — 2,000 email credits, 25 mobile credits, intent data, A/B testing, call recording. Organization: $119/user/month — 4,000 email credits, 50 mobile credits, advanced reporting, custom data fields.
  • Pros
  • 275M+ verified contacts — largest database with consistent email accuracy rates above 85%
  • Intent data is one of the most valuable B2B features for prioritizing outreach timing
  • Built-in sequencer means one tool for database + outreach — reduces tech stack complexity
  • Strong free plan — 50 email credits/month is enough to test the database quality
  • 4.8/5 on G2 from 6,700+ reviews — most trusted large-database outbound tool
  • Cons
  • Database accuracy lower in non-US markets — UK, EU, APAC data less consistently verified
  • UI has a significant learning curve — not intuitive for first-time users
  • Monthly credit limits can be restrictive for high-volume teams on lower plans

Frequently Asked Questions

Everything you need to know about Apollo.io

Is Apollo.io data GDPR compliant?
Apollo collects B2B contact data from public web sources and maintains GDPR compliance processes including data subject rights management and DPA agreements for EU customers. However, when using Apollo for outreach in EU markets, you are responsible for your own GDPR compliance including having a legitimate interest basis for contacting prospects. Apollo provides DPA agreements and documentation to support your compliance efforts.
Apollo’s verified email addresses have an average bounce rate of approximately 10–15%, which is competitive for B2B databases at this scale. They use a 6-step email verification process including SMTP verification, MX record checking, and catch-all detection. Unverified emails (marked with a risky flag) have higher bounce rates and should be used cautiously.
Yes. Many teams use Apollo exclusively for database access and lead research, then export contacts to other outreach tools like Instantly.ai, Lemlist, or Outreach. Apollo’s database and enrichment features work independently of the sequencer. This is common for teams who prefer a specialized sequencer for deliverability.
Apollo’s intent data tracks online research behavior of B2B buyers — specifically which companies are searching for topics related to your product category. When companies visit review sites, search for competitor names, read relevant industry content, or visit your website, Apollo’s intent engine detects this signal and surfaces those companies as high-priority targets. Intent data is available from Professional plan upward.
Apollo and ZoomInfo both provide B2B contact databases, but Apollo is significantly more affordable — ZoomInfo typically costs $10,000–$50,000/year vs Apollo’s $49–$119/user/month. Apollo’s database is comparable in size (275M vs ZoomInfo’s 321M) with Apollo having an edge in contact enrichment freshness. ZoomInfo’s advantages are data accuracy in enterprise segments, deeper company intelligence, and more established compliance infrastructure.