Spotify is the latest app to experience a vertical video feed similar to TikTok’s successful design.

A new feature in an initial test build for iPhone reveals a new Discover tab added to the app’s front page.

It has vertical music video clips that users can scroll through quickly, similar to the TikTok interface.

It’s still unclear whether the feature is slated for a broad release or is just a test that may never be added to the main app.

It was first discovered by Chris Messina, widely credited as the inventor of the hashtag, who posted a short video on Twitter showing the new system in action.

Mr. Messina told the Techcrunch news site – who first reported the story – who found the new feature in the TestFlight build – Apple’s name for beta versions of apps for early adopters.

Many app companies, such as Twitter and Facebook, test such features many months before rolling them out to all users, and some tests are never released.

Spotify told Techcrunch it wasn’t formally announcing the new feature.

“At Spotify, we regularly conduct a series of tests in an effort to improve our user experience,” a spokesperson said.

“Some of these tests end up paving the way for our broader user experience and others serve only as important learning. We currently have no further news to share.”

TikTok’s vertical scrolling video format has been repeatedly copied since the Chinese-owned app hit the scene in 2016 and has exploded in popularity in recent years.

YouTube has an experimental version called Shorts, Instagram has introduced a similar feature called Reels, and Snapchat has added Spotlight. Other apps with similar characteristics to their central pillar include Byte and Triller.