I have ADHD tendencies. I leave things half-done, go home with my work keys still in my pocket, and as soon as I start something else I completely forget the task I was doing before. Reminders don’t work — I just don’t look at them. Checklists don’t work either — I forget to check them in the first place. So I built PocketCheck. It periodically asks, “Anything to put in your pocket?” It’s a pocket that stands in for my working memory. I forget what I put in my actual pockets all the time, but this pocket remembers for me. Input is minimal: just a name, or just a photo if I’m in a hurry. Since I started using it, I still forget things — but now I notice in time. Open source (GPL-3.0), no Google Play Services required.