An app onboarding survey asks new users how setting up went while they still remember each step. This template takes under a minute: an effort score for setup, a multiple choice on the steps that confused them, from signing up to finding the way around, and one open question on what they expected the app to do.
It is written for the end of the first session or the second time someone opens the app. In a web app, your code can fire a custom event when setup is done and the survey opens (from Starter, or on 1 survey on Free). Inside a phone app, have the app open the survey's link at the same point. You can also send it by email to a list of new users, with the effort score inside the message.
Usertick reads each written answer, files it under a category such as getting started or features and gaps, and marks it as an idea, a complaint or a question. Results shows the setup score on the 1 to 7 scale with the share who found it easy, and bars for each confusing step, each against the period before.