On the heels of an antitrust loss for Apple Inc. at the U.S. Supreme Court, a growing swirl of regulatory scrutiny around the world for big technology companies, and a newly announced congressional probe looking into big tech’s market dominance, Apple was hit again on the antitrust front Tuesday with a private lawsuit.

Lawyers at Hagens Berman Sobol Shapiro filed suit in the U.S. District Court for the Northern District of California on behalf of developers who claim Apple’s app store is “exclusive and anti-competitive by design” in ways that violate the federal antitrust laws and California’s Unfair Competition Act.