HBO Now, the standalone subscription service for the premium network, appears to be a hit with iOS users, says new data from analytics service App Annie.

After launching on Apple TV and the App Store for iPhone, iPad, and iPod touch in early April with a 1-month free trial, the new report says the standalone service’s app “debuted at #1 on our Worldwide May iOS revenue charts” showing that the free trial converted users to paid customers.

A month after the trial ended for day one subscribers, App Annie says HBO Now sat at “#2 overall daily grossing rank in the United States” according to its data. Showtime is planning a similar standalone service that will launch next month.

It’s also interesting to see where Spotify and Beats Music sit on App Annie’s chart ahead of Apple Music’s launch on Tuesday. Apple Music will offer a 3-month free trial period for users and will be pre-installed, but Beats Music users should convert to Apple Music customers and the company certainly hopes to steal customers from Spotify. HBO Now’s performance is also good news for the revenue outlook of Apple’s rumored web TV service as cord cutters are clearly willing to pay for content.

HBO Now is available on the App Store for $14.99/month.