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What is FullContact?
Privacy-focused identity resolution platform that unifies fragmented customer data across records, identifies anonymous website visitors in real-time, and enriches profiles with 900+ personal and professional attributes drawn from 248 million US profiles updated daily.
FullContact news
Acquired by Ziff Davis
FullContact was acquired by Ziff Davis in late 2024 and now operates under Ziff Davis's martech group as an identity resolution platform.
FullContact MCP in Early Access
FullContact announced early-access preview of an MCP (Model Context Protocol) server for LLM integration, currently available to select customers.
Key features
Acumen
Identifies anonymous B2B website visitors in real-time, revealing professional contact information and browsing activity; delivers up to 85% match rates for publishers
Resolve
Unifies fragmented customer records across systems into single profiles with portable PersonID; deduplicates scattered identifiers (emails, phone, device IDs)
Enrich
Appends 900+ personal and professional attributes via API; responds in ~40 milliseconds with daily data refreshes
Integration
Integrates with Salesforce, HubSpot, Segment, Snowflake, Klaviyo for CRM and CDP activation
FullContact pricing
Most FullContact products require sales quote; only Acumen and one Enrich bundle have public pricing. Billing model is per matched API call.
| Plan | Price | What's included |
|---|---|---|
| Developer | Free | ~100 API calls/month; evaluation tier with access to Person, Company, Address APIs |
| Acumen Essentials | $99/month | 150 leads/month, single domain, 12-month term ($1,188 annual commitment) |
| Acumen Core | $300/month | 500 leads/month, up to 5 domains, 12-month term ($3,600 annual commitment) |
| Growth | $99/month | ~10,000 API calls/month for SMB production use (historically advertised self-serve tier) |
| Basic | ~$500/month | Entry enterprise tier for small businesses (annual contract via sales) |
| Premium | ~$2,000/month | Mid-tier for medium businesses with higher volume and support (annual contract) |
| Enterprise | $10,000+/month custom | Custom high-volume access, bespoke data bundles, dedicated support; annual contract |
Pros & cons
Pros
- + Strong privacy-first architecture suitable for regulated industries
- + Broad identity resolution across multiple channels and devices
- + Stable API with 99.9% uptime per user reviews
- + Public, well-documented REST APIs for developers
- + Fast response times (~40ms) with daily data refreshes
- + Match rates up to 85% for publishers and marketers
- + Good integrations with enterprise marketing and CRM platforms
- + Eliminates duplicate records to reduce wasted marketing spend
Cons
- − No public pricing for Resolve or broader platform access (sales-quoted only)
- − No free trial available
- − Requires enterprise sales conversation and annual contracts for most plans
- − U.S.-centric data coverage; weak for international records
- − Not designed for outbound sales prospecting or cold outreach
- − No outreach or sequencing tools included
- − Pricing only pencils out at enterprise scale; SMBs often seek cheaper alternatives
- − Thin recent review base (only 2 of 30 newest G2 reviews after May 2023)
- − Interface and UX considered dated by some users
Who is FullContact best for?
- • Marketing teams needing privacy-compliant identity resolution for personalization
- • Data teams with large first-party customer files requiring deduplication and enrichment
- • Enterprises resolving customer identities across channels and touchpoints
- • Companies in regulated industries requiring privacy-safe data handling
- • MarTech and AdTech platforms delivering unified customer views
- • Publishers enabling hyper-targeted engagement
- • CDP and CRM enrichment use cases
Frequently asked questions
Does FullContact prospecting?
No. FullContact is identity resolution and enrichment infrastructure, not a prospecting or cold-email tool. It requires identifiers (email, name, phone) you bring to it; there is no search interface to build new lists.
How is FullContact different from Apollo or ZoomInfo?
FullContact specializes in privacy-compliant identity resolution across channels; Apollo is sales-focused with prospecting, outreach, and sequencing; ZoomInfo emphasizes B2B database and intent signals. FullContact solves identity deduplication, not lead generation.
What is the FullContact PersonID?
A persistent, portable identifier linking fragmented records (emails, phones, device IDs) into one unified customer profile within the FullContact platform.
Does FullContact have a free plan?
Yes, the Developer plan is free with ~100 API calls/month for evaluation and testing, but no production use. No free trial for paid plans.
How often is FullContact data refreshed?
Daily. The platform maintains 248 million US profiles updated continuously and delivers ~40-millisecond response times.
