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Apollo.io vs Plunk: 2026 Comparison

Apollo.io Plunk
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. Open-source email platform combining transactional emails and marketing campaigns with a developer-friendly approach.
Pricing Freemium ($0-99/mo) Freemium ($0-custom/mo)
Key Features
  • Contact database
  • email sequencing
  • dialer
  • LinkedIn integration
  • buying intent signals
  • data enrichment
  • CRM sync
  • lead scoring
  • Transactional email
  • Marketing email
  • Open-source
  • API
  • Automation
  • Analytics
  • Contacts
Pros
  • Massive contact database
  • Generous free tier
  • All-in-one platform
  • Good data accuracy
  • Open-source
  • Developer friendly
  • Transactional + marketing
  • Free self-hosted
Cons
  • Data can be outdated for smaller companies
  • UI can feel cluttered
  • Email deliverability issues at scale
  • Very new
  • Limited features
  • Small community