ID5
European identity provider whose shared ID5 ID gives publishers and ad platforms a cookieless universal identifier.
De-facto European universal ID for the post-cookie open web.
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Ranked by reviewed relationship first, then by the capabilities they share with ID5.
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ID5 Pros & Cons
Key strengths and limitations to consider, drafted by an AI model from public sources
Strengths
- Strong native support for Prebid.js and OpenRTB
- Works across web, mobile app and CTV
- Neutral identity layer not owned by a DSP
- Snowflake native app supports privacy-preserving match previews
Limitations
- Commercial pricing is not publicly disclosed
- Value depends on downstream buyer adoption
- Primary focus is advertising, not enterprise customer identity
- Some enrichment capabilities require paid add-ons
Ideal For
Who benefits most from ID5, drafted by an AI model from public sources
Quick Analysis
ID5 is an independent identity infrastructure provider in the programmatic advertising identity-resolution market. Its core product issues a shared, encrypted ID5 Universal ID and resolves publisher, device and partner identifiers for use in OpenRTB, audience activation, measurement and addressability. It is closer to LiveRamp ATS, EUID and Unified ID 2.0 than to a general-purpose CDP or CRM identity graph.
Its strengths are neutral positioning, strong Prebid and OpenRTB support, consent-aware identifier handling, and coverage across web, mobile app and CTV. The ideal customer is a publisher, SSP, DSP, data platform or advertiser that needs interoperable advertising identity without building its own graph. Compared with LiveRamp ATS, ID5 is more deeply embedded in publisher monetization and header bidding; compared with The Trade Desk UID 2.0 and EUID, it is less tied to a single buyer ecosystem and offers broader partner-side identity enrichment.
Buyers should evaluate ID5 when programmatic addressability, publisher yield or cross-platform ad identity is the primary requirement. Advertisers seeking deterministic onboarding and closed-loop measurement may prefer LiveRamp ATS or TransUnion; publishers already standardized on The Trade Desk or European Unified ID should assess incremental reach carefully. Validate match rates by geography and browser, consent behavior, partner coverage, ID persistence, CTV and mobile implementation effort, data-sharing terms, and the commercial costs of paid enrichment services.
News publisher improving Safari and Firefox addressability through Prebid.js
SSP enriching bid requests with ID5 and partner identifiers
CTV platform resolving consented device IDs before OpenRTB auctions
Advertiser testing hashed-email match coverage before data onboarding
Global media network sharing a privacy-aware ID across multiple domains
Ad-tech platform reducing cookie-sync dependence across DSP integrations
Capabilities
Core Capabilities
Also Supports
Pricing
Model
custom
Publishers can use the ID5 ID free of charge after registering for an ID5 Partner Number, subject to ID5's data usage and privacy terms.
Checked and not offered
6 capabilities that other identity resolution tools are built around, which ID5 does not appear to cover. Each was checked against ID5's own documentation in three separate AI passes, and only a majority verdict is recorded — the count is on each row.
A gap is not a fault — a product that does one job well is a reasonable thing to buy. It is only expensive when you find out after signing.
Knowledge Base checked for governed buying, selling, or exchange of audience data
Checked: https://wiki.id5.io/docs· 3 of 3 passes agreed it is absent
Knowledge Base checked for general data-quality, deduplication, and validation tooling
Checked: https://wiki.id5.io/docs· 3 of 3 passes agreed it is absent
Knowledge Base checked for agent builders and orchestration workflows
Checked: https://wiki.id5.io/docs· 3 of 3 passes agreed it is absent
Knowledge Base checked for MCP, agent SDK, and function-calling interfaces
Checked: https://wiki.id5.io/docs· 3 of 3 passes agreed it is absent
Knowledge Base checked for autonomous AI agents
Checked: https://wiki.id5.io/docs· 3 of 3 passes agreed it is absent
Knowledge Base checked for in-product AI assistants and copilots
Checked: https://wiki.id5.io/docs· 3 of 3 passes agreed it is absent
Read from public documentation, and documentation lags shipping. If you work at ID5 and this is out of date, and we will record the correction against your name.
Runs alongside, not instead of
One tool that overlap ID5 on paper and were judged to do a different job in practice. Worth knowing before a consolidation exercise deletes one of them. These judgements were drafted by an AI model, and most were accepted on its confidence rather than checked one by one; the reason is recorded against each pair.
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