WASHINGTON—Lawmakers and mobile app companies took aim at Apple Inc. and Alphabet Inc.’s Google in a hearing Wednesday focused on competition concerns about the companies’ power over their smartphone ecosystems.

The hearing marked an escalation of lawmakers’ antitrust scrutiny on smartphone makers, and particularly Apple.

Google already has been sued by federal and state authorities for alleged antitrust violations, but much of that scrutiny has focused on its search and advertising businesses.

The hearing pitted executives from Apple and Google against familiar critics, including music streaming service Spotify Technology SA, online dating service provider Match Group Inc. and tracking-device maker Tile Inc.

“Apple abuses its dominant position as a gatekeeper to insulate itself from competition and disadvantage rival services such as Spotify,” said Horacio Gutierrez, Spotify’s chief legal officer. That hurts consumers through higher prices, less innovation and less choice, he said.

Kristen Daru, general counsel of Apple critic Tile Inc., listens during the Senate hearing.

Photo: Stefani Reynolds/Bloomberg News

Tile argued that Apple has taken other steps to unfairly disadvantage its service, and recently has announced plans to launch a competing product.

While most of the criticism was directed at Apple, Google also came under attack, mainly over commissions it and Apple charge for payment processing.

Apple and Google executives responded by reiterating the importance of maintaining high standards for their app stores, including security.

“There’s an incredible amount of investment that we make into the app store” that is recouped through the commissions, said Kyle Andeer, Apple’s chief compliance officer. “We think that’s a fair deal and it’s proven out.”

Mr. Andeer added that the company’s tracking products are significantly different from Tile’s and weren’t the product of unfair competitive practices.

Wilson White, a Google public policy executive, said Google’s Android has made computing more accessible to underserved communities, adding that its commission structure supports entry and innovation.

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Apple might have exacerbated its problems by resisting the Senate antitrust subcommittee’s requests to provide a company official to testify. Sen. Amy Klobuchar (D., Minn.), the subcommittee’s chairwoman, and Sen. Mike Lee (R., Utah), its ranking Republican, wrote a letter to Apple Chief Executive Tim Cook at one point, urging him to comply with their requests.

“Apple’s power over the cost, distribution and availability of mobile applications on the Apple devices used by millions of consumers raises serious competition issues that are of interest to the subcommittee, consumers, and app developers,” the two wrote. Apple eventually agreed to provide a witness.

Wednesday’s hearing could help prompt action from U.S. authorities, and provide further momentum for legislation to help rein in the tech companies that dominate the increasingly important mobile app environment, lawmakers said.

Ms. Klobuchar used the hearing to drum up support for her broad antitrust legislation, which she said would make it easier for enforcers to go after tech companies for exclusionary conduct.

Write to John D. McKinnon at [email protected]

Corrections & Amplifications
The hearing was held on Wednesday. An earlier version of this article incorrectly said Thursday. (Corrected on April 21, 2021.)

Copyright ©2020 Dow Jones & Company, Inc. All Rights Reserved. 87990cbe856818d5eddac44c7b1cdeb8

This post first appeared on wsj.com

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