App makers Meta Platforms Inc., Spotify Technology SA and Match Group Inc. are girding for a high-stakes political battle with the world’s two dominant smartphone platforms over who should take responsibility for verifying users’ ages.

Facebook owner Meta Platforms has launched a stand-alone artificial-intelligence app, becoming the latest technology giant to enter a field already facing intense competition.

Facebook parent Meta Platforms on Tuesday launched a separate app for its Meta AI assistant, similar to those offered by Microsoft-backed OpenAI and Alphabet's Google.