This type of app could be useful for solving a variety of problems that involve keeping track of a numerical value, such as:

Counting items: Users could use a counter app to keep track of the number of items in a list or inventory.

Tracking progress: Users could use a counter app to track their progress towards a goal, such as steps taken, minutes of exercise, or items completed on a to-do list.

Keeping score: Users could use a counter app to keep score in a game or competition.

Measuring quantities: Users could use a counter app to measure quantities, such as the number of servings of a recipe or the number of items in a package.

Overall, a React counter app can be a useful tool for solving problems that involve keeping track of a numerical value in a simple and intuitive way.