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Apollo.io

B2B contact database and outreach

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What Apollo.io is

Apollo.io is a sales platform built on a large B2B database. Teams filter companies and people by industry, size, region and role, retrieve contact details, and run outreach sequences, calls and CRM synchronisation from the same place.

What you can do with it

  • Build lists of target accounts and people
  • Retrieve email and phone contact data
  • Run multi-step outreach sequences
  • Log calls and activity
  • Sync records with a CRM

Who it is for

  • Sales development and account teams
  • Founders doing their own outreach
  • Agencies running campaigns for clients

What to watch out for

  • Contact data is personal data: in the EU and UK you need a lawful basis, and people have rights to object and be erased
  • Cold email and calling rules differ by country, including consent requirements in Europe and opt-out duties elsewhere
  • Database records go stale, producing bounces and misaddressed messages
  • Volume outreach damages your domain reputation and brand if prospects mark it as unwanted

Pros & cons

✓ What we like

  • Large database with strong filtering
  • Outreach and CRM in one platform
  • Useful for early-stage pipeline building

! What to watch out for

  • Data protection obligations are real
  • Cold outreach rules vary by country
  • Stale records cause bounces

FAQ

Is the contact data compliant to use?

Determine your lawful basis and honour objections and erasure requests; rules differ by jurisdiction.

Can I email everyone I find?

Check consent and marketing rules in each recipient's country first.

What should I monitor?

Bounce rates, complaints and whether outreach is landing as intended.

Last reviewed: 2026-09-18

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