Best B2B Data Providers (2026)

How We Evaluated

Four factors:

1. Accuracy — Are emails valid? Are contacts current?

2. Coverage — Can you find your ICP?

3. Depth — Company size, tech stack, funding, intent signals?

4. Value — What do you actually get for the price?

We've used all of these for real campaigns. Not demo accounts. Real sends.

The 7 Best B2B Data Providers

1. Apollo — Best Overall Value

Price: Free tier available | $49/mo (basic) | $99/mo (professional)

Database size: 275M+ contacts

What you get:

• Contact emails and phone numbers

• Company data (size, industry, tech stack)

• Intent signals

• Job change alerts

• Built-in sequencing

Accuracy: 85-90% — always verify before sending

Our take: Best starting point for most teams. The free tier is generous. Professional tier unlocks intent data and better filters. Just don't skip verification.

2. ZoomInfo — Best Enterprise Data

Price: Starting $15,000+/year (enterprise pricing)

Database size: 300M+ contacts

What you get:

• Extensive company data

• Buyer intent signals

• Org charts

• Direct dials

• Integration with major CRMs

Accuracy: 90%+ — among the best

Our take: If budget allows, ZoomInfo's data quality is hard to beat. The intent signals help prioritize outreach. But the price puts it out of reach for most startups.

3. LinkedIn Sales Navigator — Best for Research

Price: $99/mo (core) | $149/mo (advanced)

What you get:

• Search LinkedIn's full database

• Saved lead lists

• InMail credits

• Company alerts

• Buyer intent (on Advanced)

Accuracy: It's LinkedIn — the data is self-reported and mostly current

Our take: Essential for prospecting research. But you can't export emails directly. Pair with Apollo or Clearbit for contact info.

4. Clearbit — Best for Enrichment

Price: Custom pricing (based on volume)

What you get:

• Email-to-company matching

• Company firmographics

• Tech stack detection

• Role and seniority data

• Real-time enrichment API

Accuracy: 90%+ on enrichment

Our take: Clearbit excels at turning email addresses into rich profiles. Great for inbound lead scoring and website visitor identification. Less useful for cold outreach building.

5. Cognism — Best for Europe + Phone Numbers

Price: Custom pricing (~$15,000+/year)

Database size: 400M+ contacts globally

What you get:

• GDPR-compliant European data

• Direct dial phone numbers

• Intent data

• Bombora integration

Accuracy: 95%+ phone number accuracy (their specialty)

Our take: If you're calling prospects or targeting European markets, Cognism is worth the premium. Their phone data is notably better than competitors.

6. Lusha — Best Chrome Extension

Price: Free tier | $36/mo (pro) | $59/mo (premium)

What you get:

• LinkedIn profile enrichment

• Direct emails and phone numbers

• Chrome extension

• CRM sync

Accuracy: 85%+ — verify before sending

Our take: Fast and convenient for individual prospecting. The extension makes it easy to grab data while browsing. Better for sales reps than large-scale list building.

7. Clay — Best for Custom Workflows

Price: $149/mo (starter) | $349/mo (explorer) | $800/mo (pro)

What you get:

• Waterfall enrichment (pulls from 50+ sources)

• AI personalization at scale

• Custom formulas and workflows

• Integration with any data source

Accuracy: Varies by source — Clay aggregates, doesn't own data

Our take: Clay isn't a data provider — it's a data orchestrator. We use it heavily. Connect Apollo, Clearbit, LinkedIn, and custom sources. Let Clay waterfall through them for best coverage.

How We Use Data at BuzzLead

Our waterfall approach:

• Layer 1: Apollo for foundation (company + contact basics)

• Layer 2: LinkedIn Sales Nav for research validation

• Layer 3: Clearbit for enrichment (tech stack, company signals)

• Layer 4: Clay to tie it together with custom personalization

Then verify everything through NeverBounce before sending.

This process powered campaigns generating $8M+ in pipeline for clients.

The Real Talk on Accuracy

Every provider claims 90%+ accuracy. In practice:

• Expect 70-85% valid on any single source

• Layering sources improves coverage

• Always verify before sending — no exceptions

Data decays 2-3% monthly. Yesterday's perfect list is today's bounce risk.