I built a maintenance tracking app that I can use for household/garden tasks. I had a problem where things like replacing a battery for a chicken coop, I'd be a month late on replacing it and I had it in my calendar to replace every august, so I'd be replacing it early every year. And I also had in my calendar to fertilize my hop plants every 2 weeks, which meant in January I'd get a calendar event to fertilize my hop plants.
And sometimes my wife wonders what we have to do (especially in spring) for gardening, planting, chickens, etc.
I have paid for to do apps to try and tackle this by using the NLP "every 3 months" etc to basically accomplish this.
I think you're smart to spin it out to its own thing because I tend to use them differently batching my chores into a time gate and then using my "chore list" to know what needs to be done. And also the notifications for chores tend to distract from "Important one time task you don't want to forget".
I'd consider paying for this if the app was well done and reasonably priced.
And sometimes my wife wonders what we have to do (especially in spring) for gardening, planting, chickens, etc.
https://upkeepnest.com