Apple is facing a proposed $2.7 billion UK lawsuit over its app tracking rules, according to reports from multiple outlets. The case is filed as a collective action at London’s Competition Appeal Tribunal, which hears certain competition-related disputes.

The claim centers on Apple’s App Tracking Transparency (ATT) framework, which sets requirements for how apps request permission to track users across other apps and websites. App developers allege that Apple’s rules are applied more stringently to third-party services than to Apple’s own advertising-related offerings, giving Apple an unfair advantage.

While the outlets broadly agree on the lawsuit’s scale, forum, and core allegation, they focus on different framing details. NDTV and Yahoo Finance describe the dispute as targeting “unfair” tracking rules and cite the developers’ view that third parties face tougher conditions. Quartz adds that the complaint specifically compares the stricter requirements for third-party developers against Apple’s own services. Channel NewsAsia likewise reports the lawsuit figure and the ATT-related premise, without indicating a different underlying legal theory.