Unified ID 2.0 (The Trade Desk) is an open‑source, privacy‑first identifier built to replace third‑party cookies for cross‑site measurement and targeting. The list below highlights 20 other cookieless identity solutions that advertisers, publishers, and data platforms can adopt to retain audience continuity while staying compliant with consent and privacy regulations.
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Deterministic identity graph that matches offline and online data to a persistent, privacy‑compliant identifier for cross‑device targeting without third‑party cookies.
Open‑source, consent‑driven identifier that leverages first‑party data and hashed email addresses to create a universal, cookieless ID.
Enterprise‑grade identity resolution that unifies customer profiles across channels using first‑party data and Adobe’s privacy framework.
Privacy‑safe, probabilistic and deterministic identity solution that creates a persistent ID from hashed email, phone, and device signals.
Cookieless identity that combines first‑party data with contextual signals to generate a unified audience identifier.
Criteo’s proprietary ID that uses hashed email and device data to enable cross‑site retargeting while respecting GDPR/CCPA.
Amazon‑generated identifier that links shopper behavior across Amazon properties and third‑party sites via first‑party data.
Server‑to‑server data pipeline that sends hashed user events directly to Meta, enabling cookieless measurement and optimization.
Google’s on‑device interest clustering that replaces cookies with privacy‑preserving topics for ad relevance.
Deterministic identity graph that merges first‑party data with consent signals to create a universal, privacy‑compliant ID.
A unified, consent‑driven identity solution that links offline and online data for precise audience activation.
Cross‑device identifier built from first‑party signals and hashed identifiers, designed for privacy‑first advertising.
Enterprise identity resolution that combines first‑party data with Oracle’s data cloud to generate a persistent, consent‑aware ID.
Publisher‑first identity that uses hashed email and device data to enable cookieless targeting across the open‑web.
Deterministic ID built from first‑party data, enabling privacy‑compliant audience matching for programmatic buying.
Cookieless identifier that leverages first‑party data and consent signals to maintain audience continuity across video and display.
Mobile‑first identity solution that creates a persistent ID from hashed device IDs and first‑party signals for in‑app advertising.
Privacy‑safe ID that combines first‑party data with contextual signals, enabling cross‑site measurement without cookies.
Data‑cloud based identity graph that unifies first‑party data across Snowflake’s platform, providing a cookieless ID for analytics and activation.
Community‑maintained forks of the original Unified ID 2.0 spec, offering self‑hosted implementations for brands that want full control.