I am planning to conduct an 1:1 think-aloud test on some wireframes in order to gather some findings for the usability and the value of a service. I would also like to add a question at the end of the test that I could use in the future to benchmark UI changes in the service.
I was thinking the NPS question "How likely is it that you recommend this service to a friend or colleague" but on the other hand I am a bit sceptical if this question is relevant on the first steps of building an app.
What I would really like to ask is something like "Would you use this app?"
Do you have any suggestions or insights regarding which is the correct question to ask for this case and setup?