Probably not exactly what you are looking for (and not maintained anymore) but this app allows you to set up your subscriptions (like phone plan, internet, streaming services, etc.) and it reminds you once the subscription is about to be renewed. You could set different time intervals for your different tasks.

I’m using GPodder with AntennaPod on my smartphone and Kasts on my PC. Works good if you don’t switch between smartphone and PC very often (it syncs every x minutes with the server, so it can get out of sync if you start using your other device and sync hadn’t happened yet)