Here are some of the types of mobile apps that we can be built using Flutter:

1. E-commerce apps: Flutter can be used to build e-commerce apps with features such as product catalogs, shopping carts, payment gateways, and user accounts.

2. Social networking apps: Flutter can be used to build social networking apps that allow users to connect with each other, share content, and interact with groups.

3. Fitness apps: Flutter can be used to build fitness apps with features such as workout tracking, calorie counting, and progress monitoring.

4. Travel apps: Flutter can be used to build travel apps with features such as itinerary planning, hotel and flight booking, and destination guides.

5. Music apps: Flutter can be used to build music apps with features such as audio playback, playlist creation, and social sharing.

6. News apps: Flutter can be used to build news apps with features such as article categorization, search functionality, and push notifications.

7. Gaming apps: Flutter can be used to build 2D games with features such as animations, physics engines, and game logic