Final answer:
The answers that clients write down on their app are called user inputs or user responses.
Step-by-step explanation:
The answers that clients write down on their app are called user inputs or user responses. These are the information or data provided by the clients through the app interface.
For example, in a quiz app, when a question is presented to the user, the client can write down their answer in the app as a text input or select the correct option from multiple choices. These answers are then stored and processed by the app to provide feedback or to calculate scores.