Spotify just turned up the volume on its latest fight with Apple
Spotify app
Spotify for the iPhone

by Rob Pegoraro

Spotify is unhappy with Apple. Again.

But this time, the streaming-music service has turned up the volume on its latest gripe by alleging that the Cupertino, Calif., company rejected an update to its iOS app. The supposed defect in that release? It will no longer let listeners sign up for Spotify’s premium service through iOS’s in-app purchasing system, a mechanism that gives Apple 30 percent of the proceeds for the first year of a subscription.

And the London-based service seems cranky enough to have circulated its letter of complaint to Apple (AAPL) among Capitol Hill types, Recode’s Peter Kafka reported Thursday. Sen. Elizabeth Warren (D.-Mass.) may be among them. In a speech Wednesday about the economic power of some tech companies, she said, “Apple has placed conditions on its rivals that make it difficult for them to offer competitive streaming services.”

How things are supposed to work

The first rule of the App Store is that Apple makes the rules for the App Store. As the introduction to its app-review guidelines states: “We will reject apps for any content or behavior that we believe is over the line. What line, you ask? Well, as a Supreme Court Justice once said, ‘I’ll know it when I see it’. And we think that you will also know it when you cross it.”

(The quote—actually, “I know it when I see it”—came from Justice Potter Stewart in a case that involved alleged pornography, which is one of the categories of apps that Apple bans.)

But those guidelines contain specific rules about apps that provide access to subscription content, and they don’t forbid what Spotify allegedly did. Section 3.1.1 says that if you sell a subscription in an app, “you must use in-app purchase.” It also says you can’t steer customers to an offsite signup: “Apps may not include buttons, external links, or other calls to action that direct customers to purchasing mechanisms other than [in-app purchases].”

But historically, Apple has not objected to apps that don’t offer any way to open a new subscription. That’s how Amazon (AMZN) and Netflix (NFLX) ensure Apple can’t take 30 cents out of every dollar of a new video subscription—their apps only let you log into an existing account.

Apple announced last month that it would take only 15 percent of an in-app subscription after a year. But Spotify and other developers say that Apple’s policy of standing in the middle of an in-app transaction gives them no way to implore a canceling subscriber to stick around.

Spotify does, however, do one thing that Apple once said it wouldn’t allow. It charges $12.99 when customers sign up for a subscription in the iOS app, not the usual $9.99, to compensate for Apple’s cut. When Apple launched in-app subscriptions in 2011, it said developers had to offer the same price in or off the app.