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Apollo.io vs Mailosaur: 2026 Comparison

Apollo.io Mailosaur
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. Email and SMS testing platform for QA teams to automate testing of transactional emails and notifications.
Pricing Freemium ($0-99/mo) Subscription ($9-custom/mo)
Key Features
  • Contact database
  • email sequencing
  • dialer
  • LinkedIn integration
  • buying intent signals
  • data enrichment
  • CRM sync
  • lead scoring
  • Email testing
  • SMS testing
  • API
  • Automation
  • Preview rendering
  • Spam testing
  • Link checking
Pros
  • Massive contact database
  • Generous free tier
  • All-in-one platform
  • Good data accuracy
  • QA focused
  • Automation friendly
  • Good API
  • Reliable
Cons
  • Data can be outdated for smaller companies
  • UI can feel cluttered
  • Email deliverability issues at scale
  • QA niche
  • No marketing features
  • Developer tool

Apollo.io

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Mailosaur

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