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Apollo.io vs Customer.io: 2026 Comparison

Apollo.io Customer.io
Overview Apollo.io is an all-in-one sales intelligence and engagement platform with a database of over 275 million contacts. It combines prospecting, enrichment, and outreach automation in a single workflow. Automated messaging platform for tech-savvy marketers to create data-driven email, push, SMS, and in-app campaigns.
Pricing Freemium ($0-99/mo) Subscription ($100-custom/mo)
Key Features
  • Contact database
  • email sequencing
  • dialer
  • LinkedIn integration
  • buying intent signals
  • data enrichment
  • CRM sync
  • lead scoring
  • Behavioral emails
  • Push notifications
  • SMS
  • In-app messages
  • Webhooks
  • Data pipelines
  • Workflows
Pros
  • Massive contact database
  • Generous free tier
  • All-in-one platform
  • Good data accuracy
  • Powerful behavioral targeting
  • Multi-channel
  • Great for SaaS
  • Good data tools
Cons
  • Data can be outdated for smaller companies
  • UI can feel cluttered
  • Email deliverability issues at scale
  • Expensive
  • Requires technical setup
  • Steep learning curve

Apollo.io

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Customer.io

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