What is the ruling on using walking apps that offer rewards, such as the Sweatcoin app?

There are two types of walking applications that offer rewards:

The first: Those that require payment for subscription or to withdraw rewards. This is forbidden because it is based on gambling (maysir) and Gharar (excessive uncertainty), and these are among the major sins.

The second: Those that do not require such payment. The basic ruling is that it is permissible to subscribe to them, and the reward is a conditional gift. However, it is advisable to avoid them because they may damage the phone's battery, be used for espionage, and earn revenue from advertisements, some of which may be forbidden.

The general advice is to avoid these applications.