About ZoomInfo SalesOS

ZoomInfo SalesOS is the intelligence layer of ZoomInfo's broader AI go-to-market platform, built on what the company describes as the largest B2B dataset available: 500 million contacts, 100 million companies, 135 million-plus verified phone numbers, and 200 million-plus verified business email addresses. Its GTM Context Graph processes over 1.5 billion data points daily, fusing this contact and intent data with a customer's own CRM records, conversation transcripts (via its 2021 Chorus.ai acquisition), and behavioral signals to answer questions neither a CRM nor an engagement tool can answer alone: who to sell to, who the decision-makers are, and which accounts are actively in-market right now. It integrates with Salesforce, HubSpot, Outreach, Salesloft, and 10-plus other platforms, and is most commonly used by small businesses (60% of reviewers) despite its enterprise-grade data depth.

Key features

500M+ contact database

One of the largest and most frequently refreshed B2B contact datasets available

GTM Context Graph

Fuses data, intent, conversation, and behavioral signals into unified account context

Chorus conversation intelligence

Call analysis integrated directly into the broader GTM data layer

WebSights website intelligence

Identifies anonymous website visitors and their buying signals

Pros and cons

✓ Pros

Largest and most comprehensive B2B dataset in the category

GTM Context Graph provides genuinely unified account context other tools fragment across multiple platforms

Chorus integration adds conversation intelligence natively rather than as a bolt-on

Broad integration coverage across major CRMs and engagement platforms

✗ Cons

No published self-serve pricing; requires custom enterprise contracts

Reported 60-day auto-renewal clause has drawn hundreds of buyer complaints

Real cost often runs $30,000-$60,000+ annually once seats and add-ons are included

Complexity may be more than smaller teams need despite majority small-business adoption

Best for

Teams needing the deepest available B2B contact and intent dataOrganizations wanting conversation intelligence unified with prospecting dataEnterprises running complex, multi-signal account-based strategiesCompanies already invested in the ZoomInfo ecosystem via Chorus or Engage

Why this score

500M+ verified B2B contacts with GTM Context Graph intelligence platform

G2 4.4/5. 500M+ contacts GTM Context Graph.