Leading mobile apps in the United States 2023, by unique visitors

In November 2023, the YouTube's mobile app was the most popular smartphone app in the United States, with approximately 161 million unique monthly users in the country on iOS and Android combined. Facebook followed with approximately 140 million monthly active users, while Gmail was reported having 136 million active users in the examined month.

In the United States, the mobile internet user penetration is set to reach 87.6 percent of the population in 2026. Some of the most popular app categories on the Apple App Store are dedicated to gaming, business, or education. In July 2021, casual mobile gaming app Fidget Trading 3D was the most popular game for iPhone users, with more than 4.16 million downloads.

Mobile social networks, including Facebook, Twitter, Instagram, are still among the most popular social apps for mobile users in the country. However, video apps YouTube and TikTok have quickly become users' favorite social media. As of March 2021, social video apps reported the highest user engagement rates among iOS users in the United States, with users spending 8.7 hours weekly on TikTok and more than five hours weekly on YouTube. In June 2021, the popular short-video app TikTok was counting more than 6.1 million downloads from iOS users in the United States.