Top 42 Identity Resolution Software SaaS Companies in May 2026

San Francisco, California, United States

Ketch is redefining responsible data use for the AI era. The Ketch Data Permissioning Platform is the new layer of business technology that helps brands collect, control, and activate permissioned, privacy-safe data across every device, system, and third-party app. Brands around the world use Ketch to simplify privacy and consent operations, increase revenue from advertising, data, and AI initiatives, and build trust with customers and partners. To learn more, visit ketch.com.

London, England, United Kingdom

Realeyes is the only fully Responsible AI for computer vision. We use webcams to understand identity, attention and emotions of users who opt-in to make their every digital experience better. It takes only 2-lines of code to integrate, and we are the only tech that can run it privacy-safe on-device without high battery drain. Our 200+ enterprise customers are top brands, media companies and tech platforms looking to increase their advertising effectiveness (PreView), scale digital identity solutions (Verify) and improve core KPIs of their products (XP). Our mission is to create trillion more smiles every year - we will achieve this in partnerships with leading digital products that improve people's lives by making them work better for billions of people.

Paris, Île-de-France, France

mediarithmics is the holistic Customer Data Platform that helps enterprise players revolutionise growth by re-architecting consumer engagement at scale. We power real-time marketing personalisation, cookieless audience monetisation and agile data collaboration within a single technology solution. By de-siloing data across your business, we enable marketing, monetisation, product and data teams to action insights to create more compelling customer experiences. Since 2013, mediarithmics has partnered with some of Europe's most forward-thinking businesses, including Channel 4, Fnac-Darty, Havas Media, Orange Advertising, TF1, Canal+ and many more. In 2023 we acquired Easyence to strengthen our ability to connect retail and media and improve revenue performance for clients.

London, England, United Kingdom

ID5 is redefining identity for digital advertising, building solutions where privacy and addressability work in sync. Its Adaptive Identity technology learns and adjusts, ensuring seamless recognition across media properties, devices, and channels. This allows media owners to unlock sustainable revenue, enables advertisers to deliver measurable results, and helps platforms to maximize data and inventory value. Founded in 2017 by industry experts, ID5 is driving the future of identity–connecting, evolving, and empowering the digital advertising ecosystem.

New York, New York, United States

At 33Across, our goal is to make the open web work without cookies in a way that is simple and fair for publishers. Our identity solution, Lexicon, makes inventory easily addressable across all browsers for publishers, SSPs, DSPs, and data companies.