A reminders app with a manual progress bar. I made this as part of a university project and used it this semester to keep track of my submissions. I now use it for other tasks in my day-to-day life. It makes me less stressed seeing that I've made progress on my tasks rather than seeing a long list of tasks that are undone.
Never forget to renew your passport again.
Get a reminder in your inbox when you have to make a new one!