Most seems pretty expensive for such a simple idea too.
A) Advertising is literally interested in preying on people without ADHD, and reducing them to people with ADHD insofar as it relates to closing a sale.
B) If you are an ADHD sufferer, you know every second you put into ADHD mitigation, is one second you aren't putting into living a happy normal life. The ROI of yet another unintuitive, constantly changing, recurringly paid for App, is probably negative.
C) You are overrepresented in the Software development space, and as of right now it is an economic reality that it is highly likely you are pulling in significantly higher income than the average Joe, which makes you a high-likelihood target for snake-oil salesman.
D) For every 1000 people who ultimately don't bite, there is 1 person who bites and pays (profit if one time payment business model), gets nothing out of it and (if recurring subscription) forgets to cancel recurring payments (cash cow/whale). Law of large numbers is on said person's side. Every App, you need to treat as if you were courting them as a business partner/someone you're willing to grant a share of your ongoing revenue
E) You could probably code most of them yourself on your own time, and learn something/enjoy it to boot.
F) Things like ADHD are wet dreams to people with no ethics and low overhead to establishing an offering, which an App or software solution fundamentally is.
G) What services are you frequenting/subscribed to? Unless advertisers are correlating something else with ADHD, or just xasting a wide net, there may be a medical info leak somewhere that's leading to those ads in particular targetinng you.
Might want to wipe out cookies/reset advertising id, what have you.
Long story short: Less is more. No App'll cure what ails you, and a fool and their money are soon parted.