And according to Hobbi's description on the Apple App Store:
"Hobbi wants to help you document and remember the things you love to do. You can save photos of the projects you're working on and the activities you love to do, whether it's cooking, baking, DIY, arts & crafts, fitness or home decor. You can then organize your photos into visual collections in order to see the progress you're making over time. You might just surprise yourself with how much you have done."
TechCrunch also points out that while Hobbi is like Pinterest in that you can pin DIY hobbies, it's also not as it's more about tracking personal progress to track development.
You can check out the app here.