Digital subscriptions ( e.g. newspaper, shutterstock, etc ) manager ?

I have experienced the same problem. After a little more research I've found there already exist a couple of alternatives ( they even have some marketing posts on important magazines https://www.pcmag.com/how-to/how-to-track-and-manage-your-paid-subscriptions ) so I guess the concept works. Perhaps if I dumb it down to doing one thing very good ( perhaps only reamind of free trials or something ) and make it easier to use there could be something there to explore