Becky Hansmeyer:

YarnBuddy is a project tracker and a row counter. That means its primary job is to help you keep track of all the knitting or crochet projects you’re working on (or have worked on in the past) as well as where exactly you left off on each one. Its secondary job is to help you keep an inventory of all the yarn you’ve acquired (there’s always so. much. yarn. 😅).

I don't knit of crochet, so this app isn't made for me, but it looks really nice, so I had to share it in case you fall directly in that target market. This app looks great!