Kind of silly, but the association to ADHD makes me feel like I need to have the disorder to make the most use of this app. Maybe pull back a bit on that part of the marketing? People who have ADHD know how valuable checklist apps are, just seems like you're needlessly narrowing your target market.
Yes, there’s a big marker for good checklists. My wife is a nurse and they need to use checklists when working g with patients in the OR and PACU, and since she uses them so much at work she now makes lists for everything at home. Something like this would be a good idea.
The Checklist Manifesto by Atul Gawande is a book written by a doctor on the use of Checklists that actually got me using them in the first place :)