Cookieless

Cookieless describes a tool or method that does not rely on a browser cookie to identify a visitor; a term often used loosely that needs to be made precise.

The ambiguity comes from the fact that “cookieless” can mean three quite different things: no persistent identifier at all, no third-party cookie but a first-party one, or an identifier held in local storage instead of a cookie. These three are not equal in privacy or in data accuracy. In marketing, “cookieless” is sometimes a reassuring claim without clarifying what replaced the cookie; as noted under cookie-free tracking, the replacement can be more invasive than a cookie. For the professional reader, the right question is not “cookie or no cookie” but “what is stored, is it first-party or third-party, and how long does it last.”