Leading mobile apps in the United States 2025, by unique visitors

In February 2025, the YouTube's mobile app was the most popular smartphone app in the United States, with approximately 167 million unique monthly users in the country on iOS and Android combined. Gmail followed with approximately 148 million monthly active users, while Facebook was reported having 146.6 million active users in the examined month. 

In the United States, the mobile internet user penetration is set to reach 92.5 percent of the population in 2029. 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 Black Blast! was the most popular game for iPhone users, with more than 1.66 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. In June 2021, the popular short-video app TikTok was counting more than 6.5 million downloads from iOS users in the United States during the last quarter of 2023.