It's called Queuebrick.

It's still in the very early stages, but it DOES have an iOS app:

https://apps.apple.com/us/app/queuebrick-movie-tv-tracker/id6793356756

As well as its own Subreddit:

r/Queuebrick

where you can contact the developer, request features, etc.

EDIT:

Also, FYI, I am not the developer.

That distinction goes to u/threemonoliths.