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Apollo.io vs Windmill: 2026 Comparison

Apollo.io Windmill
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. An open-source developer platform for building internal tools, workflows, and scripts with a focus on developer experience.
Pricing Freemium ($0-99/mo) Freemium (Free-$40/user/month)
Key Features
  • Contact database
  • email sequencing
  • dialer
  • LinkedIn integration
  • buying intent signals
  • data enrichment
  • CRM sync
  • lead scoring
  • Script editor
  • Workflow builder
  • App builder
  • Scheduling
  • Webhooks
  • Self-hosted
  • Multi-language
  • Version control
Pros
  • Massive contact database
  • Generous free tier
  • All-in-one platform
  • Good data accuracy
  • Open source
  • Developer-first
  • Self-hosted option
  • Multi-language support
Cons
  • Data can be outdated for smaller companies
  • UI can feel cluttered
  • Email deliverability issues at scale
  • Newer platform
  • Smaller community
  • Documentation growing
  • Limited UI components