Once More
Quis lavabit ipsas lavatrices?
I find it really hard to keep track of the category of chore that you only need to do every 1 or 2 or 3 months: when did I last change the air filters? When did I last wash the washing machine? So I made a little tool to track these:

There are lots of apps out there that offer similar services, but I wanted something extremely simple, with local data storage, and where I could track long-gap recurring tasks rather than daily habits.
If you want to use this yourself, navigate to this website from your phone and save the icon on your home screen for easy access. Enter the names of tasks you want to keep track of and the frequency you want to do them, and then check back occasionally to see if you're overdue. That's it!
THIS IS NOT AN APP, IT IS A WEBPAGE THAT STORES DATA LOCALLY ON YOUR PHONE, which means that if you ever clear your browser cache it will delete all the data. You can export the data as a .csv file occasionally to make sure you don't lose it, and/or you can accept the impermanence of all things.
Hopefully this goes without saying, but: you should not use this or any other similarly scrappy tool for anything truly important to you, it is presented as-is with no guarantees of fitness, etc. With all that said, hope you enjoy it!
