Hunter.io and Apollo.io both find B2B email addresses, but they serve fundamentally different use cases. Hunter is built around domain-based email discovery - find everyone at a company, or guess a pattern and verify it. Apollo is built around ICP-filtered prospecting at scale - find 5,000 contacts matching your exact criteria and export them with a sequence already attached. Understanding this distinction is the fastest way to choose between them.
| Feature | Hunter.io | Apollo |
|---|---|---|
| Free tier | 25 searches + 50 verifications/mo | 50 email exports/mo |
| Paid starting price | $34/mo (500 searches) | $49/user/mo (1,000 exports) |
| Domain search | ★★★★★ - core feature | ★★★ - available but secondary |
| ICP-filtered search | ★★ - basic filters | ★★★★★ - industry, title, size, etc. |
| Contact database size | ~100M contacts | 275M+ contacts |
| Email pattern detection | Yes - finds @firstname.lastname patterns | No |
| Bulk domain lookup | Yes | Via filters + export |
| Built-in email verification | Yes (basic) | Yes (basic) |
| Catch-all scoring | No | No |
| Built-in sequencer | No | Yes (Apollo Sequences) |
| Chrome extension | Yes | Yes |
| CRM integrations | HubSpot, Salesforce, Pipedrive | HubSpot, Salesforce, Pipedrive |
| API | Yes, well documented | Yes, full-featured |
| Clay integration | Native (Hunter step) | Native (Apollo step) |
| GDPR compliant | Yes | Yes |
Hunter’s domain search is the fastest way to find all known contacts at a specific company. Enter a domain, get every email Hunter has indexed for it, with confidence scores. No contact database needed.
If you know John Smith works at acme.com but don’t have his email, Hunter’s Email Finder guesses the pattern (firstname.lastname@, firstnamelastname@, etc.) from other known contacts at the domain, then verifies.
Hunter includes basic email verification in all plans. For teams that just need a quick valid/invalid check without dedicated verification tooling, this is convenient - though not a replacement for BounceZero’s catch-all scoring.
For ABM workflows where you’re researching 50-200 specific target accounts rather than building a filtered list of thousands, Hunter’s domain-by-domain approach fits naturally.
Apollo’s search lets you filter by job title, industry, company size, location, funding stage, technology stack, and more. Export a ready-to-use list of contacts matching your ICP in minutes - something Hunter cannot do.
Apollo includes built-in email sequences (Apollo Sequences). You can find contacts and enroll them in a sequence without leaving the platform. Hunter has no sequencer.
At scale, Apollo’s database and filter system is far more efficient than Hunter’s domain-by-domain approach. One Apollo search replaces hundreds of individual Hunter domain lookups.
Apollo includes company technographics (what software a company uses), funding data, and hiring signals as filters. Hunter has no equivalent.
| Plan | Hunter.io | Apollo |
|---|---|---|
| Free | 25 searches, 50 verifications/mo | 50 exports/mo, basic filters |
| Starter/Basic | $34/mo - 500 searches | $49/user/mo - 1,000 exports, full filters |
| Growth/Pro | $104/mo - 5,000 searches | $99/user/mo - unlimited emails, AI |
| Business/Org | $349/mo - 50,000 searches | $149/user/mo - advanced permissions |
| Enterprise | Custom | Custom |
Many cold email teams use Apollo for volume ICP prospecting and Hunter for targeted account research. In Clay’s waterfall enrichment workflow, Hunter is often a step after Apollo - if Apollo can’t find an email for a contact, try Hunter’s domain search as a fallback.
Hunter.io is better for finding emails from a known domain or verifying a pattern guess. Apollo is better for prospecting at scale - searching by title, industry, location, company size, and exporting contact lists with built-in sequencing.
Hunter.io has a free plan with 25 searches and 50 verifications per month. Paid plans start at $34/month (Starter) for 500 searches. Apollo’s free tier offers 50 email exports per month.
Yes, Hunter.io includes basic email verification. However, it doesn’t provide catch-all deliverability scoring or detailed classification. For comprehensive verification before cold email campaigns, use BounceZero after Hunter or Apollo exports.
Whether you use Hunter, Apollo, or both, verify your export with BounceZero before loading into your sequencer. Even the best finders produce 8-20% undeliverable addresses. 100 free credits, no card required.
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.
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