Download websites that use LINE Login

About LINE Login

An authentication button is a statement about who a site expects to arrive. LINE Login is a Proprietary sign in service from LINE Corporation, available since 2014, that lets a visitor authenticate with the messaging account they already hold rather than creating a new password. Nobody wires up an identity provider for an audience they do not have. As of October 2026 we detect LINE Login on 125 sites.

The presence of this login is therefore a geographic signal, and an unusually direct one. The messaging platform behind it has its user base concentrated in a handful of East and Southeast Asian markets, so a site offering the button is telling us that a meaningful share of its expected visitors are in those markets. The signal holds regardless of where the company is registered, what language the homepage is written in, or which top level domain it uses. A European retailer chasing Japanese customers looks entirely European in every other column of our data and shows its hand here.

Sites carrying a messaging platform login are also revealing something about the maturity of their stack. Adding a third party identity provider means somebody wrote account linking code, decided what to do about duplicate accounts and missing email addresses, and accepted an operational dependency on an external service. Brochure sites do not do that work. The population skews towards ecommerce, media, ticketing and membership sites with real accounts and real sessions behind them, which is a more valuable segment than a raw domain count would suggest.

Detection here is client side and therefore partial. We identify the integration from the JavaScript SDK and the login endpoints that a public page references, which means we see it when the button renders somewhere a crawler can reach. A site that hides the login behind a checkout step, inside a mobile application, or on a route that requires an existing session will not show it to us at all. Our count is the visible surface of the integration rather than a count of companies using the service, and the gap between those two numbers is real.

The question a downloadable list answers is a market entry question. A vendor deciding whether to build support for this login into a checkout, a CRM or a marketing automation product needs to know how many live sites already made that bet and what sort of businesses they are. An agency pitching localisation work wants the sites that half localised, meaning the ones that added the login without translating the catalogue behind it. A payments or logistics provider serving the same corridor needs the same list approached from the other direction. None of that is reachable one domain at a time, because the value sits in the whole set and in what our other columns say about each site in it.