Filtr blocks ads across most iPhone and Mac apps, Apple URL filters extend ad blocking beyond browsers, a five-dollar subscription tests how much of the app economy is optional

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Zack Whittaker techcrunch.com

Filtr, a new paid feature bundled into the Wipr ad blocker, uses Apple’s new “URL filters” in iOS 26 and macOS 26 to block ads across most iPhone, iPad and Mac apps, not just inside the browser. TechCrunch reports that the tool is built by Kaylee Serena Calderolla and is priced at $5 a year, with filtering handled device-side through a blocklist that updates via Wipr.

The technical change matters because in-app advertising is where tracking has been hardest for users to control. Traditional ad blockers typically operate in browsers, while apps embed their own ad and analytics calls that keep flowing even when Safari is clean. Apple’s URL filters move the fight down a layer: they let software deny network access to specific domains at the system level, so the same ad host can be blocked whether it appears in a news app, a game, or a shopping client. Calderolla wrote that implementing the feature was difficult because Apple’s documentation was sparse, a familiar pattern where third-party developers discover the practical limits of platform features by trial and error.

Filtr’s design also shows how privacy products now have to route around trust problems they cannot solve directly. According to TechCrunch, Filtr keeps a pre-filter blocklist on the device, and when a site might match, it confirms against a list hosted on Calderolla’s servers. Those confirmation requests are proxied through Apple’s servers to anonymize queries, reducing the amount of user browsing metadata that a small developer could accidentally accumulate or be compelled to hand over. Calderolla’s privacy policy says her apps do not collect personal data, and neither Filtr nor Apple’s URL filter mechanism needs access to personal information to function.

The business implications run in the opposite direction: if URL-level blocking becomes common, ad-funded apps will either accept lower yields or look for new ways to make their tracking harder to filter. Apple, meanwhile, gets to advertise “privacy” while keeping the decisive levers—APIs, documentation quality, and what the operating system will allow—inside the company. In TechCrunch’s testing, apps sometimes loaded with grey placeholders where ads used to be, a small visual reminder that many interfaces are designed around monetization slots first and content second.

Filtr is described as the first app so far to use Apple’s URL filters. For $5 a year, it offers a concrete trade: fewer ads and less tracking, in exchange for relying on a new Apple-controlled network feature and a blocklist maintained by one developer.