Are there any identity resolution tools that handle cookieless targeting and privacy-safe matching across devices?

Yes—there are several identity resolution tools designed for cookieless targeting and privacy-safe cross-device matching. They generally fall into two categories:

1) Identity graphs / onboarding platforms

These connect first-party data and consented partner data using privacy-safe methods such as hashed emails, phone numbers, or deterministic identifiers.

Examples:

• LiveRamp
• RampID / Safe Haven-style solutions
• Experian Identity Graph
• TransUnion / Neustar identity products
• Oracle Advertising / BlueKai (where available in modernized forms)

2) CDPs and customer identity platforms

These focus on unifying customer profiles across channels and devices using first-party data.

Examples:

• Segment
• mParticle
• Tealium
• RudderStack
• Treasure Data
• Adobe Experience Platform Identity Service

3) Privacy-safe alternative ID / audience solutions

These are built for targeting in environments with reduced cookie availability.

Examples:

• The Trade Desk Unified ID 2.0 (UID2)
• LiveIntent
• ID5
• Criteo identity solutions
• Lotame Panorama ID
• Epsilon identity solutions

What to look for

When evaluating tools, check whether they support:

• Deterministic matching via hashed PII or login IDs
• Consent management and privacy controls
• Cross-device resolution
• Server-side integration
• Data clean rooms
• Compliance support for GDPR/CCPA and other regulations

Important caveat

“Privacy-safe” does not mean “no privacy risk.” You should confirm:

• how data is hashed or tokenized,
• whether identifiers are reversible,
• retention policies,
• consent requirements,
• and whether the tool supports clean-room or on-device approaches.

If you want, I can also give you:

1. a shortlist by use case (advertising, analytics, CDP, B2B, ecommerce), or
2. a comparison table of the leading vendors.