AdTech Vendor · Data Provider / Broker
First-id vs ID5
Structured technology and market comparison · 2026
Direct Feature Comparison
First-id · vs · ID5Privacy-first deterministic identity infrastructure for cookieless advertising.
Privacy-first identity infrastructure for cookieless digital advertising.
Analyze all overlapping signals and tech stacks for First-id and ID5
Compare mutual enterprise clients, monetization models, live market signals, and partner networks directly in the interactive Knowledge Graph.
Comparison Analysis
What is the main difference between First-id and ID5?
When comparing First-id and ID5, both platforms operate within the Identity Management & Universal ID, In-App, and AdTech Vendor ecosystem. First-id is positioned as Privacy-first deterministic identity infrastructure for cookieless advertising, whereas ID5 focuses on Privacy-first identity infrastructure for cookieless digital advertising. Decision-makers evaluate both solutions when orchestrating their commercial monetization and technology stack.
What are the top alternatives to First-id and ID5?
When evaluating First-id and ID5, enterprise buyers also consider other platforms in Identity Management & Universal ID, In-App, and AdTech Vendor. You can discover the full competitive landscape and evaluate other alternatives by viewing their respective footprint profiles on Polaris7.
How do the corporate scale, structure, and headquarters of First-id and ID5 compare?
First-id is headquartered in FR (founded in 2022) with 10–49 employees. ID5 is based in GB (founded in 2017) with 50–200 employees. Complete ownership, subsidiary trees, and corporate affiliations are documented across Polaris7.
Market Signals
Recent Market Signals & Activity: First-id vs ID5
Documented market movements, strategic partnerships, product releases, and regulatory developments mapped across Polaris7.
First-id
Recent Signals
- ·First-id
ArcSpan accélère la monétisation des audiences des éditeurs français grâce à l’intégration native de First-id
Les éditeurs équipés de First-id peuvent désormais créer, analyser, valoriser et activer leurs audiences dans ArcSpan AMS, sans développement supplémentaire.
- ·First-id
First-id annonce de nouveaux partenariats et intégrations
First-id a publié plusieurs annonces récentes, notamment l'intégration native avec ArcSpan pour la monétisation des audiences, un partenariat avec Commanders Act pour le contrôle de l'identité marketing, et l'extension de l'offre CTV de Stamp. Ces annonces s'ajoutent à une série d'autres mises à jour de partenariats et d'intégrations.
- ·ExchangeWireIdentity
ArcSpan Integrates First-id for Persistent Cookieless Publisher Identity
ArcSpan, an AI-powered audience monetization platform for premium publishers, announced a native integration with First-id, a persistent, deterministic identity solution adopted by over 35,000 media and advertiser sites across 101 countries. This integration allows publishers using First-id to resolve audience signals within ArcSpan AMS without custom integrations. Publishers can build, analyze, and activate first-party audiences across direct, programmatic, and data collaboration channels. The combined solution addresses the challenge of fragmented user identities by providing a persistent identifier that works without third-party cookies or logins, enabling improved audience continuity, deduplicated reach, and enhanced monetization opportunities. The integration is live and available to existing customers, supporting ArcSpan's expansion across EMEA.
- ArcSpan announced a native integration with First-id on September 21, 2026.
- First-id is a persistent, deterministic identity solution adopted by more than 35,000 media and advertiser sites in 101 countries.
- The integration enables publishers to resolve audience signals against the First-id identifier within ArcSpan AMS.
ID5
Recent Signals
No recent market signals documented for ID5 in the current tracking window.
Compare their exact ecosystem overlaps.
Explore all deep relationships in Polaris7. Discover exactly which mutual clients, integrated technologies, and overlapping partners First-id and ID5 share across the market ecosystem.