Best B2B data providers and contact databases, compared by buyer

The right B2B data provider depends on the buyer. Apollo suits teams wanting a large database with a free plan and built-in sequencing. ZoomInfo suits enterprises needing broad coverage and direct dials on a custom contract. Lusha and Wiza suit reps who need emails and phone numbers. Leadsets suits AI agents needing search and verified work emails at a flat monthly price, without phone numbers.

Facts about other products checked on 2026-11-09 · sources listed below

Provider	Best for	Starting price	Pricing model	Phone numbers	API / MCP
Apollo	Teams wanting a large database plus sequencing and a dialer	Free; Basic $59/seat/mo monthly ($49 billed annually)	Per-seat credits, expire each cycle	Yes (5 credits each)	REST API; MCP on all plans incl. Free
ZoomInfo	Enterprises needing broad coverage, intent data and direct dials	Platform: not published (third-party Vendr median $33,500/yr); GTM.ai Free	Custom annual contract; GTM.ai data and AI credits	Yes; mobile data on GTM.ai Enterprise	Data API; MCP with a licence
Lusha	Reps who want emails and phones from an extension or CRM	Free 40 credits/mo; Starter $49.90/mo monthly ($37.45 billed annually)	Credits, 1 charged per request	Yes (5 credits each)	API key on every plan; MCP
Wiza	Profile-by-profile LinkedIn prospecting with emails and mobiles	Free 20 emails + 5 phones once; Starter $49/user/mo	Per user with overage; API credits $0.025 each	Yes	REST API; MCP
Leadsets	AI agents and GTM engineers needing search, verified work emails and flat cost	Free 1,000 records once; Solo $29/mo	Flat monthly, visible fair-use limits	No (not yet)	MCP + REST, TS and Python SDKs

How we compared

This page covers providers whose core product is a B2B contact and company database you can search and enrich. We checked each vendor's own pricing, data, API and trust pages on 2026-11-09 and compared them on five criteria:

Coverage and data types. Work emails, phone numbers, company data and signals. A contact database that cannot return phones will not suit a calling team.
Email verification. How the vendor checks addresses and whether uncertain results (such as catch-all emails) are labelled separately.
Pricing model. Published prices, seats, credits, rollover and what you pay for empty results.
Access. App and extension for reps, REST API for code, and MCP for AI agents.
Compliance. Certifications that exist today, not planned ones.

Database sizes and accuracy figures below are the vendors' own claims; we have not tested them. Third-party figures are labelled as such. If you are new to the category, what is B2B data explains the basics.

We ordered the list by fit for a buyer searching for a B2B contact database: established scale, phone coverage and published pricing count in a provider's favour here. Leadsets is listed last because it has no phone numbers yet and does not publish a headline record count, which matters to many buyers in this category. It is a closer fit for a different query, covered in our guide to the B2B data API for AI agents.

The providers, in order of fit

1. Apollo

Apollo combines a contact and company database with sequencing, a dialer and deal tools. Apollo says it has 240M+ global contacts, 30M+ companies and a 98% email accuracy rate, with intent data powered by Bombora. It publishes prices: a free plan with 100 credits per seat per month, and Basic at $59 per seat per month billed monthly ($49 billed annually). An email costs 1 credit and a phone number 5, and unused credits expire at the end of each billing cycle. Apollo offers an official MCP server on every plan, including Free, and says it is SOC 2 Type II and ISO 27001 certified. It sits first because most buyers can start free and grow into a full sales platform. Details: Apollo pricing.

2. ZoomInfo

ZoomInfo says it has 410M+ contact profiles, 300M+ verified business emails and 135M+ direct dial numbers, plus intent, scoops and warehouse delivery. Main platform pricing is not published; a third-party Vendr estimate puts the median at $33,500 a year. A newer self-serve option, GTM.ai by ZoomInfo, gives 1,000 data credits and 1,000 AI credits free at signup, then pay as you go. ZoomInfo lists ISO 27001, 27017 and 27701 and an AICPA SOC report. It suits enterprises with budget for a contract; third-party reviews report auto-renewing annual terms. See ZoomInfo pricing.

3. Lusha

Lusha sells emails, phone numbers and firmographics through a web app, browser extension, CRM integrations, an API and an MCP server. Lusha says it has 515M+ verified contacts and claims 98% email and 86% phone accuracy; third-party reviews estimate email accuracy lower, around 75 to 81%. Starter is $49.90 a month billed monthly. A phone costs 5 credits, and at least 1 credit is charged per request even when no data comes back. Lusha claims SOC 2 Type II and several ISO certifications.

4. Wiza

Wiza finds and verifies work emails, personal emails and mobile numbers, with checks run at request time. Wiza says it has 850M+ contacts. Plans are per user (Starter $49 per user per month), and only valid emails are charged; risky ones are free. Note that bulk export from LinkedIn and Sales Navigator search pages was removed on Aug 19, 2026, so the extension now works on individual profiles. Wiza has a REST API, prepaid API credits at $0.025 each and an MCP server.

5. Leadsets

Leadsets is a B2B data API and remote MCP server built for AI agents, with eight tools for people and company search, enrichment, email verification and website scraping. Pricing is flat: 1,000 free records once, then Solo $29, Pro $99, Team $399 or Max $999 a month, with no credits and fair-use limits per five hours and per week. Records count only when data comes back. Every email is labelled verified, catch-all, unknown or invalid, and every field carries its source and last-checked date. It has no phone numbers yet, and SOC 2 Type I is planned (target Q3 2027), not done. Plans: pricing.

Which tool suits which buyer

A sales team that wants one platform for data, sequences and calls: Apollo.
An enterprise needing the broadest coverage, intent data and procurement paperwork: ZoomInfo.
Reps who call as much as they email and work from a browser extension: Lusha or Wiza.
A buyer whose security review requires SOC 2 today: Apollo, ZoomInfo, Lusha or Wiza, not Leadsets yet.
A GTM engineer or founder who wants an AI agent to build lists with verified work emails at a predictable monthly cost: Leadsets.

Example: one team, two needs

Maya Chen runs revenue operations at Northwind Analytics (northwind.co). She wants Claude to build a weekly list of RevOps leaders at 50 to 200 person fintechs, with verified emails pushed to a sequencer. That job fits Leadsets: the agent calls search_people, enrich_person and verify_email, and catch-alls arrive in a separate segment. Her SDR team also wants mobile numbers for call blocks. Leadsets cannot supply those, so for that part she would look at Lusha, Wiza, Apollo or ZoomInfo. Many teams run two tools this way.

Why Clay is not on this list

Clay is a strong product, but it is an enrichment and workflow platform that aggregates other providers (Clay says 50+ to 150+, including Apollo, ZoomInfo, Lusha and Wiza) rather than a contact database of its own. If you want a visual table builder with waterfall enrichment across many sources, see our Clay alternatives page.

Questions and answers

What is a B2B data provider?

A B2B data provider sells business contact and company information, such as work emails, phone numbers, job titles and firmographics, for sales and marketing. Most offer a searchable database, enrichment of records you already have, and access through an app, API or both.

Which B2B contact database is cheapest to start with?

Apollo, Lusha, Wiza, ZoomInfo's GTM.ai and Leadsets all have free options. Among published paid plans, Leadsets Solo is $29 a month flat, Wiza Starter is $49 per user per month, Lusha Starter is $49.90 a month billed monthly and Apollo Basic is $59 per seat per month billed monthly.

Which B2B data providers include phone numbers?

Apollo, ZoomInfo, Lusha and Wiza all offer phone numbers; Apollo and Lusha charge 5 credits per phone, and ZoomInfo limits mobile data on GTM.ai to its Enterprise plan. Leadsets does not offer phone numbers yet.

Is a bigger contact database always better?

Not necessarily. Headline counts are vendor claims, measured differently by each company, and what matters is coverage of your own ICP, freshness and how honestly uncertain emails are labelled. Testing a provider on a sample of your real target accounts is more reliable than comparing totals.

Which B2B data providers work with AI agents over MCP?

Apollo, ZoomInfo, Lusha, Wiza and Leadsets all have official MCP servers. Apollo's is available on every plan including Free, ZoomInfo's requires a licence, and Leadsets is built around its MCP server and REST API with flat monthly pricing.

Are B2B data providers GDPR compliant?

Most rely on legitimate interest under GDPR and offer opt-out. Apollo, ZoomInfo, Lusha and Wiza list SOC 2 reports or ISO certifications, while Leadsets runs a GDPR-aligned program with a DPA and has SOC 2 Type I planned for Q3 2027.

Sources · checked 2026-11-09

Prices and features change. If something here is out of date, email support@leadsets.ai and we'll fix it.

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