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Cookieless describes a browser condition. ID-less describes the whole problem, and it is bigger.
A third-party cookie is a small file a browser stores on behalf of a domain other than the one being visited. When Safari and Firefox stopped accepting them, the industry named the resulting gap “cookieless” and went looking for a replacement cookie. ID-less is the broader and more accurate term: it covers every environment where no durable identifier is available at all — cookieless browsers, yes, but also mobile apps and connected TV, which never had cookies in the first place.
Solving ID-less solves cookieless. The reverse is not true, and that asymmetry is the whole reason the distinction matters commercially.
Where the word “cookieless” came from
The term entered common use when browsers began blocking third-party cookies by default. Safari has done so since 2020, Firefox since 2022. Both decisions were permanent, and nothing since has reversed them.
What followed was a decade-long expectation that Chrome would do the same, and an industry that organised itself around that deadline. That expectation turned out to be wrong. Google abandoned its deprecation plan in July 2024, confirmed in April 2025 that it would not even show users a cookie choice prompt, and on 17 October 2025 retired most of the Privacy Sandbox — the replacement technology it had been building for five years, including Topics, Protected Audience and Attribution Reporting. Third-party cookies remain in Chrome today, with no end date.
So the word “cookieless” survived an event that never happened. It is still the term buyers search for, which is why it is worth using. But it describes only part of the situation.
What ID-less actually covers
Consider where digital advertising is consumed and what identifies the user in each place.
| Environment | Identifier | Status |
| Chrome | Third-party cookie | Still available |
| Safari, Firefox | Third-party cookie | Blocked by default since 2020 / 2022 |
| Mobile apps | Mobile advertising ID (MAID) | Restricted by App Tracking Transparency since 2021 |
| Connected TV | No shared identifier | Never existed |
Only the first two rows are a cookie story. Apps and CTV were never addressable through cookies, so no cookie substitute was ever going to reach them. A publisher who solved only the cookie problem would still be unable to monetise a large share of their inventory, and an advertiser who solved only the cookie problem would still be unable to attribute a CTV campaign.
As of 2026, more than 40% of web and mobile traffic occurs in environments where traditional identifiers and cookies are unavailable. That figure is the practical size of the ID-less problem, and it is why Intent IQ describes itself as an ID-less advertising solution rather than a cookie alternative.
Watch: Intent IQ Distributed Identity
How distributed identity makes users addressable without a cookie, a login or personally identifiable information.
Why the distinction changes what you should buy
The two framings lead to genuinely different purchasing decisions.
A cookie-replacement mindset looks for something shaped like a cookie: a single identifier, set once, read later. Most of the alternative IDs built on that model depend on a logged-in user or a hashed email, which means they work where people sign in and disappear where they do not. On open-web inventory, where most users never log in, coverage is thin.
An ID-less mindset starts from the opposite assumption: that no single identifier will be available everywhere, and that identity therefore has to be resolved rather than retrieved. That is what an identity graph does. Intent IQ’s graph maps relationships across four connected layers — household, person, device and profile — built from over 25 billion digital signals processed daily and more than 15 billion email open and log-in events a month. Matches run at 92%–97% accuracy, measured deterministically and verified daily, and no entity in the graph exists for longer than 48 hours before being refreshed. Learn more about our technology and the IIQ ID.
The practical difference is coverage. Intent IQ serves 3.5B+ targeted ads a day across 100,000+ websites and apps in cookieless environments, and reaches more than 300 million active individuals in North America, without requiring anyone to log in.
What this means for publishers
Inventory that reaches the auction without an identifier attracts fewer bidders and clears below its value. Supplying identity as Prebid EIDs inside the bid request restores competition. In published deployments, Publift recorded a 20.7% revenue uplift in the US and up to 70% in its strongest deployments; Fandom saw a 55–140% increase in revenue from cookieless users, with 26% higher CPMs and 58% higher fill rates; and Media Square doubled RPM on ID-less inventory in France while remaining fully GDPR compliant.
Read more about Bid Enhancement.
What this means for advertisers
The audience you cannot see is not a low-value audience. When Fandom examined its own numbers, cookieless traffic was contributing under 20% of attributable programmatic revenue — even though 79% of that audience was on iOS, where US users carry an average household income around 40% higher than Android users.
An ID-less approach lets you target and retarget those users with your existing first-party, third-party and onboarded data, through your current SSP and DSP partners, and attribute across CTV, Safari, Firefox and Edge. Read more about Cookieless Audience Activation.
In one line
If you are searching for “cookieless”, you are describing a symptom. ID-less is the diagnosis — and it is the one worth buying against, because it covers the environments a cookie fix never will.
For the full picture, read our guide to cookieless advertising.
FAQs
What is the difference between cookieless and ID-less advertising?
Cookieless refers to browsers that block third-party cookies, principally Safari and Firefox. ID-less is broader: it covers every environment where no durable identifier is available, including mobile apps after App Tracking Transparency and connected TV, which never had cookies to lose. Solving ID-less solves cookieless; the reverse is not true.
Is ID-less the same as cookieless targeting?
No. Cookieless targeting describes reaching users in browsers without third-party cookies. ID-less targeting includes that, and also covers in-app and CTV inventory where the constraint is a missing device identifier rather than a missing cookie.
Are third-party cookies still going away?
Not in Chrome. Google abandoned deprecation in July 2024, ruled out a cookie choice prompt in April 2025, and retired most Privacy Sandbox APIs on 17 October 2025. Safari and Firefox still block them by default, apps and CTV never used them, and there is no longer a platform-led replacement in development.
Does ID-less advertising require users to log in?
No. Identifiers built on logins or hashed emails only work where people sign in, which excludes most open-web traffic. Intent IQ resolves identity through first-party ID clustering and an identity graph, so addressability does not depend on authentication.
Does ID-less advertising use personal data?
No personally identifiable information is required. Intent IQ’s approach is privacy-by-design, and deployments are built to support GDPR, CCPA and GPP — the Media Square validation in France was conducted in full GDPR compliance.
Which should I ask vendors about?
Ask about ID-less coverage, not cookie replacement. Specifically: which environments are covered (Safari, Firefox, in-app, CTV), whether coverage depends on logins, how graph accuracy is measured and how often it is refreshed. Our five considerations for evaluating an identity resolution tool covers this in detail.