License & Deployment Mix: 10 tools – 0 OSS, 10 SaaS. (OSS and SaaS counts can overlap when an open-source tool also offers a vendor-hosted edition.)
Note: Data-primary – proprietary business databases.
What Is B2B Data Intelligence?
B2B data intelligence is a data-primary category. Unlike most tool evaluations where the value is in the software, B2B data platforms derive their value from proprietary databases – massive, continuously updated collections of business contact information, company firmographics, technographics, and buying intent signals. The software (portals, APIs, browser extensions, CRM integrations) is simply the front end for accessing and activating this data.
OSS is not viable here. Open-source software cannot replicate proprietary databases built over years through web scraping, data partnerships, user-contributed information, email verification infrastructure, and phone-verified contact records. The product IS the data, not the code that serves it. No open-source project can legally or practically assemble 200M+ verified business contacts with direct dials, verified emails, and corporate hierarchy data.
B2B data intelligence services are consumed through:
- API-based enrichment – real-time lookups to enrich CRM records, lead forms, and prospect lists with firmographic and contact data
- Prospecting platforms – search and filter databases of contacts and companies to build targeted outreach lists for sales teams
- Intent data feeds – signals indicating which companies are actively researching topics related to your products, enabling prioritised outreach
- Browser extensions – LinkedIn and website overlays that reveal contact details, company info, and technographics while browsing
- CRM integration – automatic enrichment of Salesforce, HubSpot, and other CRM records with verified contact and company data
The information on these pages was researched by a combination of human review and large language models. To suggest an addition or correction, please contact us. Prepared by Rhodium Systems Inc., author of the ResorsIT platform — a unified IT operations management platform for IT teams and MSPs that integrates a curated suite of open-source, commercial, and SaaS applications into a single system with shared identity, single sign-on, access control, and a common audit trail. Use this catalogue only as a starting point for your own research, and review any tool carefully against your own requirements before relying on it. Catalogue data version 2026.197.
Comparison
Overview
B2B data intelligence services are data-primary products – the value is the proprietary dataset, not the software. All tools in this category are SaaS-only commercial services with no self-hosted or open-source alternatives.
SAML is the most common SSO protocol for B2B data platforms, with OIDC available on some.
SSO / OIDC Comparison
SAML is the dominant SSO protocol in B2B data platforms. Authentik notes below assume an Authentik SAML/OIDC provider as the IdP.
| Tool | OIDC | SAML | API Auth | Authentik Notes |
|---|---|---|---|---|
| ZoomInfo | No | Yes | API key / OAuth 2.0 | SAML via Authentik SAML provider |
| Apollo.io | No | Yes | API key | SAML via Authentik SAML provider (enterprise) |
| Clearbit | No | Yes* | API key | SAML via Authentik (HubSpot Enterprise SSO) |
| 6sense | No | Yes | API key / OAuth 2.0 | SAML via Authentik SAML provider |
| Lusha | No | Yes | API key | SAML via Authentik SAML provider (enterprise) |
| Cognism | No | Yes | API key | SAML via Authentik SAML provider |
| LinkedIn Sales Nav | No | Yes* | OAuth 2.0 | SAML via Microsoft Entra (LinkedIn SSO) |
| Bombora | No | Yes | API key | SAML via Authentik SAML provider |
| DiscoverOrg | No | Yes | API key / OAuth 2.0 | Same as ZoomInfo (merged) |
| Seamless.AI | No | Yes | API key | SAML via Authentik SAML provider (enterprise) |
* = available through parent platform (HubSpot for Clearbit, Microsoft for LinkedIn)
Best SSO support: ZoomInfo (SAML + SCIM), 6sense (SAML + SCIM), Cognism (SAML)
Limited SSO: Apollo.io and Seamless.AI (SAML on enterprise tiers only), Clearbit (via HubSpot SSO)
API Comparison
| Tool | API Type | Auth | Real-Time | Batch | Webhooks |
|---|---|---|---|---|---|
| ZoomInfo | REST | OAuth 2.0 | Yes | Yes | Yes |
| Apollo.io | REST | API key | Yes | Yes | Yes |
| Clearbit | REST | API key | Yes | Yes | Yes |
| 6sense | REST | OAuth 2.0 | Yes | Yes | Yes |
| Lusha | REST | API key | Yes | Yes | No |
| Cognism | REST | API key | Yes | Yes | Yes |
| LinkedIn Sales Nav | REST | OAuth 2.0 | Yes | No | No |
| Bombora | REST / SFTP | API key | No | Yes | No |
| DiscoverOrg | REST | OAuth 2.0 | Yes | Yes | Yes |
| Seamless.AI | REST | API key | Yes | Yes | No |
Notes:
- ZoomInfo has the most comprehensive API with company search, contact search, intent data, scoops (news), and org chart endpoints
- Apollo.io offers generous API rate limits even on free tier (limited credits)
- Clearbit’s enrichment API is the most developer- friendly for real-time form enrichment
- Bombora’s intent data is primarily delivered via batch SFTP feeds or platform integrations, not real-time API calls
- LinkedIn Sales Navigator API access is restricted to LinkedIn Marketing/Sales API partners
Data Coverage Comparison
| Tool | Contacts | Companies | Intent | Technographics |
|---|---|---|---|---|
| ZoomInfo | 260M+ | 100M+ | Yes (native) | Yes |
| Apollo.io | 270M+ | 60M+ | Yes (via Bombora) | Yes |
| Clearbit | 50M+ | 50M+ | No | Yes |
| 6sense | 200M+ | 60M+ | Yes (native) | Yes |
| Lusha | 100M+ | 15M+ | No | No |
| Cognism | 400M+ | 10M+ | Yes (via Bombora) | Yes |
| LinkedIn Sales Nav | 900M+ | 60M+ | No | Limited |
| Bombora | N/A | 5M+ | Yes (native) | No |
| DiscoverOrg | (ZoomInfo) | (ZoomInfo) | Yes | Yes |
| Seamless.AI | 150M+ | N/A | No | No |
Notes:
- LinkedIn has the largest contact database but does not expose direct contact details (email, phone) through Sales Navigator – it provides InMail and connection requests instead
- Cognism claims the largest contact database by count but is strongest in European coverage
- Bombora is intent-data-only; it does not provide contact or company firmographic databases
- DiscoverOrg data is now part of ZoomInfo since the 2019 merger
- Contact counts are self-reported and vary in verification quality
Geographic Strength Comparison
| Tool | North America | Europe | APAC | Global |
|---|---|---|---|---|
| ZoomInfo | Strong | Moderate | Moderate | Good |
| Apollo.io | Strong | Moderate | Moderate | Good |
| Clearbit | Strong | Moderate | Limited | Good |
| 6sense | Strong | Moderate | Limited | Good |
| Lusha | Strong | Strong (IL) | Limited | Moderate |
| Cognism | Moderate | Strong | Moderate | Good |
| LinkedIn Sales Nav | Strong | Strong | Strong | Best |
| Bombora | Strong | Limited | Limited | Moderate |
| DiscoverOrg | (ZoomInfo) | (ZoomInfo) | (ZoomInfo) | (ZoomInfo) |
| Seamless.AI | Strong | Limited | Limited | Moderate |
Best global coverage: LinkedIn Sales Navigator (leverages LinkedIn’s 900M+ member network)
Best European coverage: Cognism (GDPR-compliant by design, phone-verified European contacts)
Best North American coverage: ZoomInfo (market leader for US/Canada B2B data)
Pricing Model Comparison
| Tool | Model | Free Tier | Entry Price | Enterprise |
|---|---|---|---|---|
| ZoomInfo | Annual subscription | No | ~$15K/yr | $25K-100K+/yr |
| Apollo.io | Freemium + tiers | Yes (limited credits) | Free / $49/mo | $99-119/mo |
| Clearbit | Usage-based | Yes (limited) | Contact sales | Custom |
| 6sense | Annual subscription | No | ~$25K/yr | $50K-120K+/yr |
| Lusha | Freemium + tiers | Yes (5 credits/mo) | $36/mo | Custom |
| Cognism | Annual subscription | No | Contact sales | Custom |
| LinkedIn Sales Nav | Per-seat subscription | Trial only | $99/mo | Custom |
| Bombora | Annual subscription | No | ~$25K/yr | $50K-100K+/yr |
| DiscoverOrg | (ZoomInfo pricing) | No | (ZoomInfo) | (ZoomInfo) |
| Seamless.AI | Freemium + tiers | Yes (50 credits) | $147/mo | Custom |
Most accessible: Apollo.io (generous free tier, lowest paid entry point)
Highest cost: ZoomInfo, 6sense, Bombora (enterprise-only pricing, annual contracts)
CRM Integration Comparison
| Tool | Salesforce | HubSpot | Dynamics | Outreach | SalesLoft |
|---|---|---|---|---|---|
| ZoomInfo | Native | Native | Native | Native | Native |
| Apollo.io | Native | Native | Via API | Native | Native |
| Clearbit | Native | Native (built-in) | No | No | No |
| 6sense | Native | Native | Native | Native | Native |
| Lusha | Native | Native | No | No | No |
| Cognism | Native | Native | Native | Native | Native |
| LinkedIn Sales Nav | Native (embedded) | Native | Native | Native | Native |
| Bombora | Via partners | Via partners | Via partners | No | No |
| DiscoverOrg | (ZoomInfo) | (ZoomInfo) | (ZoomInfo) | (ZoomInfo) | (ZoomInfo) |
| Seamless.AI | Native | Native | No | Native | Native |
Best CRM integration: ZoomInfo (deepest bi-directional sync with all major CRMs and sales engagement platforms)
Monitoring Comparison
All tools are SaaS-only. Monitoring is limited to API-level data.
| Tool | API Health | Usage Metrics | Audit Logs | Webhook Events |
|---|---|---|---|---|
| ZoomInfo | Yes | Yes (credits) | Yes | Yes |
| Apollo.io | Yes | Yes (credits) | Limited | Yes |
| Clearbit | Yes | Yes (API calls) | Limited | Yes |
| 6sense | Yes | Yes (accounts) | Yes | Yes |
| Lusha | Yes | Yes (credits) | Limited | No |
| Cognism | Yes | Yes (credits) | Yes | Yes |
| LinkedIn Sales Nav | Limited | Yes (seats) | No | No |
| Bombora | Yes | Yes (accounts) | Limited | No |
| DiscoverOrg | (ZoomInfo) | (ZoomInfo) | (ZoomInfo) | (ZoomInfo) |
| Seamless.AI | Yes | Yes (credits) | Limited | No |
Best monitoring support: ZoomInfo and 6sense (comprehensive API, audit logs, and webhook support for external monitoring integration)
Tools
10 tools.
6sense
6sense is an account-based marketing (ABM) and revenue intelligence platform that combines proprietary intent data, predictive analytics, and AI-powered account identification to help B2B organisations target and engage accounts most likely…
License: Proprietary (proprietary) · Kind: web · Deploy: saas · SSO: SAML
Apollo.io
Apollo.io is a freemium B2B prospecting and sales engagement platform with one of the largest contact databases in the market (270M+ contacts across 60M+ companies).
License: Proprietary (proprietary) · Kind: web · Deploy: saas · SSO: SAML
Bombora
Bombora is the leading independent B2B intent data provider, specialising in “Company Surge” data – signals that indicate when companies are actively researching specific topics at a rate significantly above their baseline.
License: Proprietary (proprietary) · Kind: web · Deploy: saas · SSO: SAML
Clearbit (HubSpot)
Clearbit is a B2B data enrichment platform, now part of HubSpot, with real-time APIs that augment leads, CRM records, and forms with firmographic, technographic, and contact data.
License: Proprietary (proprietary) · Kind: web · Deploy: saas · SSO: SAML
Cognism
Cognism is a B2B data intelligence platform with particular strength in European contact data and GDPR compliance.
License: Proprietary (proprietary) · Kind: web · Deploy: saas · SSO: SAML
DiscoverOrg (now ZoomInfo)
DiscoverOrg was a premium B2B data intelligence provider specialising in human-researched organisational charts, direct dial phone numbers, and verified contact data for IT, finance, and marketing decision-makers.
License: Proprietary (proprietary) · Kind: web · Deploy: saas · SSO: SAML
LinkedIn Sales Navigator
LinkedIn Sales Navigator is a premium sales intelligence tool built on LinkedIn’s professional network of 900M+ members.
License: Proprietary (proprietary) · Kind: web · Deploy: saas · SSO: SAML
Lusha
Lusha is a B2B contact data platform focused on providing verified business email addresses and direct dial phone numbers for sales prospecting.
License: Proprietary (proprietary) · Kind: web · Deploy: saas · SSO: SAML
Seamless.AI
Seamless.AI is a B2B contact data platform that differentiates through real-time AI-powered search and verification.
License: Proprietary (proprietary) · Kind: web · Deploy: saas · SSO: SAML
ZoomInfo
ZoomInfo is the market leader in B2B data intelligence, providing the most comprehensive database of business contacts, company firmographics, technographics, and intent data available.
License: Proprietary (proprietary) · Kind: web · Deploy: saas · SSO: SAML
