Request Feedback
Send this to customers who have used your product long enough to have an opinion. A short founder note asks two questions, one thing they would change and whether they would recommend you on a 0 to 10 scale, behind a single Answer 2 questions button. Link the button to your survey form and replace the founder name and photo.
Loops
Ask after real use
Build the audience from activity so the email goes to people who have actually used the product, and exclude anyone you surveyed recently. If your survey tool can write the score back to Loops as a contact property, branch later emails on it. Keep the promise in the email true: if it says a person reads every answer, make sure one does. The survey examples show other formats.