The mobile app market is constantly evolving, with new apps being released every day. However, there are a few apps that have stood the test of time and become incredibly successful. Here are the top 10 most successful apps in the USA:

1. TikTok
TikTok is a social media app that allows users to create and share short videos. It has been downloaded over 3 billion times and is the most downloaded app in the world. TikTok is popular among all age groups, but it is especially popular among Gen Z. 

2. Instagram
Instagram is another popular social media app that allows users to share photos and videos. It has been downloaded over 2 billion times and is the second most downloaded app in the world. Instagram is popular among all age groups, but it is especially popular among millennials. 

3. Facebook
Facebook is the original social media app and is still one of the most popular. It has been downloaded over 2.9 billion times. Facebook is popular among all age groups, but it is especially popular among older adults. 

4. WhatsApp
WhatsApp is a messaging app that allows users to send messages, photos, and videos. It has been downloaded over 2 billion times. WhatsApp is popular among all age groups, but it is especially popular among international users. 

5. YouTube
YouTube is a video-sharing platform that allows users to watch and share videos. It has been downloaded over 2 billion times. YouTube is popular among all age groups, but it is especially popular among younger adults. 

6. Snapchat
Snapchat is a messaging app that allows users to send disappearing messages, photos, and videos. It has been downloaded over 1 billion times. Snapchat is popular among younger adults. 

7. Spotify
Spotify is a music streaming service that allows users to listen to music on demand. It has been downloaded over 1 billion times. Spotify is popular among all age groups, but it is especially popular among younger adults. 

8. Netflix
Netflix is a streaming service that allows users to watch movies and TV shows on demand. It has over 200 million subscribers worldwide. Netflix is popular among all age groups, but it is especially popular among younger adults.

9. Amazon Shopping
Amazon Shopping is an online shopping app that allows users to buy products from Amazon. It has over 100 million active users. Amazon Shopping is popular among all age groups, but it is especially popular among older adults. 

10. Google Maps
Google Maps is a navigation app that allows users to find directions, get traffic updates, and see local businesses. It has been downloaded over 1 billion times. Google Maps is popular among all age groups. 

These are just a few of the many successful apps that are available in the USA. The mobile app market is constantly evolving, so it will be interesting to see which apps become the next big successes.

In addition to the above, here are some other factors that contribute to the success of an app:

The quality of the app. The app must be well-designed and easy to use.
The relevance of the app. The app must meet the needs of its target audience.
The marketing of the app. The app must be marketed effectively to reach its target audience.
The timing of the app. The app must be released at the right time to capitalize on trends.

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