It’s called “Bill & Subscription Manager”. You have to pretty much spell out the whole name when searching for it in the App Store and then it’s still not near the top of the list, so look for this icon:
It’s free, of course, and there are no ads or in-app purchases.
I’ve been using it myself and find it very useful. I would love it if folks on this forum would give it a try and let me know what you think.
I got tons of help from the CWC community and for that I offer my heartfelt thanks.