I've not taken much medication in my life, but have recently been prescribed a medication that I am supposed to take once a day. I'm terrible at remembering to do that, so I made a web app to run on an old iPhone 4 that will remind me to take my medication. Part of my problem was that I would forget if I had taken it or not, and I don't take it because I don't want to take too much. So, I built a quick web app using jQuery that lets me know when I last took my meds, and if I should take it now.
You can view the web app here.
You can also see the GitHub repository here.