Why UK App Developers Say Apple’s Tracking Rules Favoured Apple

App Tracking Transparency (ATT) is Apple’s privacy framework for asking users whether an app may track their activity across other companies’ apps and websites. A newly filed £2 billion collective claim at the UK Competition Appeal Tribunal (CAT) argues that Apple applied this privacy framework unevenly—restricting third-party app developers more heavily than its own advertising and data-collection activities. The claim is an allegation, not a finding of liability. 17

The core allegation: a tougher consent path for rivals

ATT requires third-party apps seeking to track users across companies’ apps and websites to obtain explicit user permission through Apple’s system. The proposed claim says this sat on top of developers’ other data-protection consent obligations, creating what claimants call a “double-consent” requirement. 512

The claimants’ central competition argument is not that user privacy should be removed. It is that Apple allegedly subjected rival app developers to a more onerous consent process while its own advertising and data activities received less restrictive treatment. They say that difference amounted to self-preferencing by the operator of the iOS ecosystem. 1712

How developers say ATT damaged their businesses

For many free-to-use apps, advertising helps fund the product. Claimants say reduced tracking permission limited the information third-party developers could use to target ads, measure campaigns and connect ad spending to app installs or other outcomes. 517

They allege that these constraints lowered advertising returns and made it more expensive or less effective to acquire users. In their account, that weakened advertising-dependent apps’ ability to compete and shifted commercial advantage toward Apple’s advertising ecosystem. The collective action seeks approximately £2 billion in damages on behalf of thousands of UK app developers. 172

Those are the claimants’ alleged effects; they have not yet been established by the CAT.

Apple’s privacy rationale is central to the dispute

ATT was introduced as a mechanism intended to give iPhone and iPad users a choice over cross-company tracking. The legal and regulatory question is therefore not simply whether Apple may offer privacy controls, but whether the specific design and application of those controls treated Apple and third parties fairly.

That distinction has featured in European regulatory action. France’s competition authority said ATT’s privacy objective was not inherently problematic, while finding that the way it was implemented was not necessary or proportionate to that stated objective. 52

What has happened in the UK case so far

ATT Collective Action Limited filed the proposed collective proceedings at the CAT on 3 September 2026. The action is brought on behalf of UK app developers, and its director, Ann Pope, is a former senior antitrust official at the UK Competition and Markets Authority. 217

The claim is intended to proceed on an opt-out basis. That does not mean Apple has been found liable or that compensation has been awarded: the CAT must still deal with the proposed proceedings and the underlying allegations. 17

European scrutiny adds context, not a UK verdict

The UK claim arrived after Germany’s Federal Cartel Office investigated ATT. In August 2026, the authority said Apple would change rules governing how developers obtain consent for personal data used in targeted advertising, closing its investigation. The authority said Apple’s framework had given Apple’s own apps more favourable consent prompts than third-party developers, raising potential competition-law concerns. 38

Apple’s agreed changes are relevant because they address the same broad issue of whether consent prompts are competitively neutral. But the German outcome does not decide the UK case, which concerns a separate collective damages claim before the CAT.

The practical takeaway

The £2 billion case is a test of whether a platform owner can implement a privacy safeguard in a way that allegedly changes competition in its own favour. For app developers, the key issue is whether ATT’s consent architecture impaired advertising monetisation and user acquisition relative to Apple’s own services. For Apple, the case puts the design of privacy controls—not the principle of user consent alone—under competition-law scrutiny. 1738