Cognism
Cognism is the GDPR-compliant data leader for EMEA. Its Diamond Data product delivers verified mobile numbers (manually checked, opt-in compliant) that work in the UK, Germany, France, and Nordics. US coverage exists but is thinner than ZoomInfo or Apollo. The platform includes intent data (similar to Bombora) and a Chrome extension for real-time prospecting. Data quality in EMEA rivals ZoomInfo in the US.
Official site ↗Why it ranks here
If you run outbound in Europe, Cognism is the only leader-tier choice. Diamond Data mobile accuracy far exceeds US providers in EMEA. Rank 3 because it is region-specific; global teams need a multi-provider stack.
Where it sits
Cognism ranks 3rd globally but 1st in EMEA. For UK and EU GTM teams, Cognism should be your primary data source, with ZoomInfo or Apollo as backfill. US-only teams can skip it entirely.
How GTM Engineering teams use it
GTM engineers use Cognism for EMEA account lists, export to Clay or Salesforce, and route Diamond Data mobiles to Outreach or Salesloft for calling campaigns. The Chrome extension is popular with SDRs for LinkedIn → phone number lookups. Teams often pair Cognism (EMEA) with ZoomInfo (US) and Apollo (global backfill) in waterfall enrichment logic.
In-depth notes
Pricing is enterprise-only with annual contracts. Diamond Data costs extra and is the reason you buy Cognism; without it, the value proposition weakens. Intent data is bundled but less mature than Bombora or 6sense. GDPR compliance is real (verified opt-ins, lawful basis), making it the only safe choice for cold calling in Europe. Be aware: Cognism sales cycles are long, and the product evolves slowly.
Best for
EMEA outbound teams, GDPR-compliant cold calling, and UK/EU enterprise account targeting.
Avoid if
You operate only in the US, APAC, or LatAm (coverage is weak outside Europe).
The rest of Data providers
Apollo Leader All-in-one data + outreach platform with 230M+ contacts, built-in sequences, and free tier for solo reps. #2 
ZoomInfo Leader Enterprise B2B data standard with 100M+ contacts, deepest US firmographics, and technographic + intent layers. #4 
Lusha Strong SMB-friendly B2B data provider with simple UI, Chrome extension, and good mid-market contact coverage. #5 
Bombora Strong B2B intent data standard (Company Surge) that tracks content consumption across 4k+ B2B sites. #8 
LeadIQ Situational Prospecting workflow tool with Chrome extension, contact data, and one-click Salesforce sync. #9 
RocketReach Situational Personal email finder with 700M+ profiles, strong coverage of executives, influencers, and passive candidates. #10 
Seamless.AI Situational Real-time contact finder with Chrome extension, strong coverage of direct dials, and aggressive UI. #11 
Hunter.io Situational Email finder and domain search tool with 100M+ email addresses, simple UI, and generous free tier. #12 
Demandbase Situational ABM platform with intent data, advertising, and account intelligence for enterprise B2B sales teams. #13 
Kaspr Niche LinkedIn Chrome extension for GDPR-compliant B2B contact data, strong in EMEA, simple UI. #14 Learning guide
Setup
Request enterprise trial via Cognism sales (no self-serve), specify EMEA coverage needs and Diamond Data mobile requirements, then complete onboarding with legal review of GDPR opt-in documentation before launching cold calling campaigns.
First thing to build
Build a UK or Germany account list (50-100 companies in financial services or enterprise SaaS), export with Diamond Data mobile numbers, and test call connection rates on 20 prospects to validate accuracy before scaling to full SDR team.
What actually matters
- Enable Diamond Data mobile coverage in export settings (costs extra credits but delivers verified, opt-in compliant mobiles that pass GDPR lawful basis requirements)
- Filter searches by country and industry to match your EMEA ICP; Cognism coverage drops significantly outside UK, France, Germany, and Nordics
- Integrate with Outreach or Salesloft via API to auto-sync Diamond Data mobiles into calling sequences, but map to a custom field (not standard phone) to preserve data lineage for compliance audits
- Track intent signals (technology changes, funding events) in saved searches and route to Salesforce for account scoring, but verify signal freshness (intent data updates weekly, not real-time)
Watch out
Diamond Data is the only reason to pay Cognism premium; if you skip it to save cost, you end up with standard aggregated data that is no better than Apollo or Lusha and fails GDPR cold-calling compliance in strict jurisdictions like Germany.