1. Installation method: applets can be used directly in applications such as WeChat and Alipay without downloading and installing, while apps need to be downloaded and installed before they can be used.

2. Function scope: The function scope of small programs is relatively small, mainly lightweight applications, while the function scope of app is wider, which can realize more complex functions.

3. Development cost: The development cost of small programs is relatively low, and front-end technology can be used for development, while the development cost of app is relatively high, requiring native development or cross-platform development technology.

4. User experience: The user experience of the applet is relatively good, and it can be opened and used quickly, while the user experience of the app is relatively poor, and it needs to be downloaded and installed, which takes a long time to start.

5. Promotion channels: The promotion of small programs mainly depends on the promotion of platforms such as WeChat and Alipay, while the promotion of app needs to be promoted through various channels such as app stores and advertisements.