10 Best Identity Resolution Tools for Founders [2026 Updated]

1. LiveRamp

• Type: Paid
• URL: https://liveramp.com
• Overview: LiveRamp provides enterprise identity resolution through RampID and IdentityLink, connecting online and offline identifiers to create persistent, privacy-safe customer profiles for cross-device marketing and measurement. It specializes in deterministic matching and data onboarding to activate unified identities across ad platforms and partners.

2. Amperity

• Type: Paid
• URL: https://amperity.com
• Overview: Amperity is a CDP focused on AI-powered identity resolution that deduplicates and stitches first-party data into stable customer profiles and golden records for personalization and analytics. The platform provides configurable match rules, visibility into merges, and warehouse-native integrations for enterprise marketing use cases.

3. mParticle

• Type: Paid
• URL: https://www.mparticle.com
• Overview: mParticle’s IDSync identity framework unifies identifiers (email, device IDs, user IDs) into mParticle IDs to build persistent customer profiles and enable cross-channel activation and data governance. It’s designed for mobile-first data collection and real-time identity stitching for marketing and analytics.

4. Segment (Twilio Segment)

• Type: Paid
• URL: https://segment.com
• Overview: Segment (part of Twilio) is a customer data platform that performs deterministic identity stitching across events and tools, creating unified profiles from multiple identifiers to power personalization and downstream activations. It focuses on event collection, identity resolution logic, and routing clean customer data to marketing destinations.

5. Experian (Marketing Services Identity Resolution)

• Type: Paid
• URL: https://www.experian.com/marketing
• Overview: Experian offers identity resolution and an identity graph that links digital and offline identifiers to create persistent consumer IDs for targeting, enrichment, and cross-channel measurement. Their solution emphasizes data cleansing, deterministic linking, and household-level views to improve ad spend efficiency.

6. Zeotap

• Type: Paid
• URL: https://zeotap.com
• Overview: Zeotap’s ID+ and customer intelligence platform provide deterministic identity resolution and enrichment by mapping CRM and first-party data to a large identity graph for activation across media and analytics. The product targets marketers needing scalable, privacy-aware identity linkage and audience connectivity in a cookieless ecosystem.

7. InfoSum

• Type: Paid
• URL: https://www.infosum.com
• Overview: InfoSum is a privacy-first identity and data collaboration platform that enables brands to match and resolve identities across siloed datasets without sharing raw PII via its decentralised identity-matching technology. It’s intended for marketers and partners who need secure identity linking for targeting and measurement while preserving data privacy.

8. Merkury (Merkle)

• Type: Paid
• URL: https://www.merkle.com/content/merkury/en/home.html
• Overview: Merkury (by Merkle/dentsu) is an enterprise identity and data platform that builds person-based identity graphs, combining deterministic and probabilistic linking to create persistent IDs for marketing activation and measurement. It’s designed for large brands seeking a managed identity solution integrated with media and CRM systems.

9. Hightouch

• Type: Paid
• URL: https://hightouch.com
• Overview: Hightouch is a warehouse-native data activation platform that offers identity resolution features to stitch identifiers in your data warehouse into customizable identity graphs and golden records for activation across marketing and analytics tools. It emphasizes keeping control of data in-warehouse while enabling deterministic and probabilistic matching rules.

10. Clearbit

• Type: Paid
• URL: https://clearbit.com
• Overview: Clearbit provides identity enrichment and matching services that resolve and enrich user and company identifiers (emails, domains) to create fuller profiles for marketing segmentation and personalization. It’s commonly used to identify anonymous web visitors, enrich CRM records, and improve targeting accuracy.