Data enrichment is the foundation of modern B2B outbound. Without accurate, comprehensive data on your prospects, every downstream activity, personalisation, scoring, routing, outreach, is guesswork.
But the enrichment landscape is a mess. There are dozens of providers, each claiming the best coverage and accuracy. The reality is that no single provider has it all. Coverage varies by geography, company size, industry, and data type. Accuracy degrades over time. And costs range from "surprisingly affordable" to "are you serious?"
Here's our honest assessment of the major players and how to combine them into a stack that actually works.
The Major Players
Apollo
What it does: Contact and company database with built-in sequencing. Apollo positions itself as an all-in-one sales intelligence and engagement platform.
Strengths:
- Massive database (260M+ contacts, 60M+ companies)
- Strong email coverage, particularly in North America
- Built-in email sequencing saves tool costs
- Generous free tier for early-stage companies
- Intent data included in higher tiers
Weaknesses:
- Email accuracy is inconsistent, we see 15-25% bounce rates on Apollo-sourced emails without secondary verification
- Phone number coverage is weak outside enterprise contacts
- European data coverage is noticeably thinner than US
- Data freshness varies, job titles and company data can be 6-12 months stale
Best for: High-volume prospecting where you need breadth over precision. Ideal as a first-pass enrichment source, supplemented by verification.
Cost: Free tier available. Paid plans from ~$49/month. Credits-based for enrichment.
Clearbit (now Breeze Intelligence by HubSpot)
What it does: Real-time company and contact enrichment via API. Now integrated into HubSpot as Breeze Intelligence.
Strengths:
- Excellent company data, firmographics, technographics, and employee count are reliably accurate
- Real-time API enrichment works well for inbound lead processing
- Strong technographic data (what tools a company uses)
- Clean, well-structured data output
Weaknesses:
- Contact email coverage has declined since the HubSpot acquisition
- Increasingly tied to the HubSpot ecosystem, standalone use is less supported
- Pricing has become less transparent
- Phone number coverage is minimal
Best for: Company-level enrichment and technographic data. Particularly valuable if you're already in the HubSpot ecosystem.
Lusha
What it does: Contact data provider focused on direct phone numbers and email addresses.
Strengths:
- Best-in-class direct dial coverage, especially for mid-market and enterprise contacts
- Strong European data coverage (Israel-based company, good EMEA presence)
- Chrome extension for LinkedIn enrichment is genuinely useful for SDRs
- Good compliance posture (GDPR, CCPA)
Weaknesses:
- Company data is limited, Lusha is a contact tool, not a company intelligence tool
- Credits run out fast if you're doing high-volume enrichment
- API access requires higher-tier plans
- No built-in sequencing or outreach
Best for: When you need phone numbers. Full stop. If your outbound motion includes cold calling, Lusha should be in your stack.
Clay
What it does: Enrichment orchestration platform that connects to 75+ data providers and enables waterfall enrichment.
Strengths:
- Not a data provider itself, it's a platform that lets you query multiple providers and take the best result
- Waterfall enrichment (try Provider A, fall back to B, then C) is native and easy to configure
- AI-powered data transformation and personalisation
- Spreadsheet interface is intuitive
- Growing integrations with sequencing and CRM tools
Weaknesses:
- You're paying Clay's fee PLUS the underlying data provider costs, it adds a layer of expense
- Can be complex to set up initially
- Processing speed degrades with large datasets
- Requires understanding of multiple data providers to use effectively
Best for: Orchestrating multi-source enrichment. If you're using more than two data providers, Clay saves enormous time.
ZoomInfo
What it does: The enterprise standard for B2B data. Comprehensive contact and company database with intent data, org charts, and buyer signals.
Strengths:
- Largest and most comprehensive B2B database
- Excellent direct dial coverage
- Strong intent data and buyer signals
- Org chart data helps map buying committees
- Enterprise-grade compliance and security
Weaknesses:
- Expensive. Enterprise contracts typically start at $15-25K/year and go much higher.
- Contract structures are rigid, annual commitments with limited flexibility
- Overkill for companies with fewer than 10 sales reps
- Data accuracy, while good, isn't dramatically better than combining Apollo + Lusha for most use cases
Best for: Enterprise sales teams with budget. If you have 20+ reps and a complex, multi-threaded sales motion, ZoomInfo's depth justifies the cost.
The Recommended Stack
For Early Stage (Pre-Series A, 1-3 reps)
Apollo (free/starter) + NeverBounce (email verification)
Total cost: $50-150/month
Apollo gives you breadth. NeverBounce catches the 15-25% of emails that would bounce. Simple, affordable, effective enough.
For Growth Stage (Series A-B, 5-15 reps)
Clay + Apollo + Lusha + NeverBounce
Total cost: $500-1,200/month
Clay orchestrates waterfall enrichment: try Apollo first for email and company data, fall back to Lusha for direct dials and missing emails. Verify all emails through NeverBounce. This combination gives you 80-90% coverage at a fraction of ZoomInfo's cost.
For Scale Stage (Series C+, 20+ reps)
ZoomInfo + Clay + Clearbit
Total cost: $2,000-5,000/month
ZoomInfo as your primary database. Clay for orchestrating enrichment on records ZoomInfo misses. Clearbit for real-time inbound enrichment and technographic data. This is the premium stack, and it delivers premium results.
The Waterfall Principle
The key insight in modern enrichment is the waterfall. No single provider has complete coverage. But by querying multiple providers in sequence, taking the first valid result, you can achieve coverage rates of 85-95%.
A typical email waterfall:
- Check Apollo → if valid email found, use it
- If not, check Lusha → if valid email found, use it
- If not, check Hunter.io → if valid email found, use it
- Verify the result through NeverBounce or ZeroBounce
- If no valid email found, flag for manual research
This approach costs more per record than using a single provider, but the coverage improvement is dramatic, and in outbound, coverage directly equals pipeline.
The Bottom Line
Don't marry a single data provider. The enrichment landscape is too fragmented and too dynamic for that. Build a stack that combines providers strategically, verify everything before you send, and invest in orchestration tools that make multi-source enrichment manageable.
The companies that treat data enrichment as a strategic capability, not just a line item, build outbound machines that consistently outperform their competitors. In a world where everyone has access to the same automation tools, data quality is the differentiator.