Hunter.io and Apollo.io are both popular email finding tools - but they solve different problems. Hunter is a domain-based email finder. Apollo is an all-in-one prospecting database with a built-in sequencer. Here’s the full comparison to help you choose.
| Feature | Apollo | Hunter.io |
|---|---|---|
| Contact database (search by title/industry) | ✓ | ✗ |
| Domain-based email pattern search | ✓ | ✓ |
| Email verification built-in | ✓ | ✓ |
| Built-in email sequencer | ✓ | ✗ |
| CRM integration (HubSpot/Salesforce) | ✓ | Partial |
| Intent data / company news signals | ✓ | ✗ |
| LinkedIn Chrome extension | ✓ | ✓ |
| A/B testing for sequences | ✓ | ✗ |
| Mobile numbers | Partial | ✗ |
| GDPR compliance / DPA | ✓ | ✓ |
| Free tier | ✓ | ✓ |
| API access | ✓ | ✓ |
Hunter and Apollo both verify emails at the time of indexing - which could be months before you export them. B2B email data decays at ~2%/month as people change jobs. A list exported from either tool that’s been indexed for 6 months will have ~12% stale addresses. Always verify Hunter or Apollo exports through BounceZero before loading into your sequencer to catch the addresses that have decayed since indexing.
Apollo is better for teams that need a full prospecting database, built-in sequencer, CRM sync, and intent data. Hunter is better for teams that have a target company list and need clean domain-based email finding without a full database subscription. Hunter is simpler and cheaper for the narrow ‘find email at company.com’ use case; Apollo is more capable for full B2B prospecting.
Apollo can replace Hunter for most use cases. Apollo has a larger database (275M+), includes a sequencer, and has a free tier. Hunter may still be preferred for domain pattern-matching workflows where finding all emails at a specific company is the main task - Hunter’s domain search is slightly cleaner for that specific workflow.
Both achieve 75-85% deliverability on US corporate domains in independent tests. Hunter’s domain search is slightly more reliable for pattern-confirmed addresses at large companies. Apollo’s database is broader but has more variability. For both: verify exports with BounceZero before sending - accuracy at time of indexing doesn’t equal accuracy today.
Both tools have data accuracy gaps. BounceZero live-verifies email addresses before they hit your sequencer. $3/1K. 100 free credits.
Ayoub built BounceZero's 5-stage validation pipeline, its dedicated BGP-announced IP infrastructure, and the Patroni HA PostgreSQL cluster behind every verification. Previously built high-volume email delivery infrastructure. Trained at 1337 Benguerir (École 42 network, 2019). Open-source: bgp_analyzer.
Apollo, ZoomInfo, Lusha and Cognism all have accuracy gaps - verify exports before sending
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