I have decided that I am going to discontinue Workshelf and remove it from sale. I just updated it one more time to remove the in-app purchases and to enable the full version for free.
If you currently have an active subscription, you do not have to cancel. I have disabled the subscription, so you will not be charged again.
I build Workshelf to respond to a potential market, not because it was something that I really wanted. I stopped development of an app that I was passionate about in order to get Workshelf ready for the release of iOS 11.
I spent a good portion of this summer working on a big 2.0 update to Workshelf that would include more extension points, a better UI, iCloud sync, and iPhone support. However as I worked on it, all I could think about was the other app that I actually wanted to build. I found myself dreading working on it. Since this was a side project and since it had not been too successful, I figured it was time to cut my losses and move on to a project I enjoy more.
If you still want to use a shelf app, I recommend Yoink. I have been using it since I decided to not make Workshelf anymore and I like it quite a bit.
I am back to working on my other project and am loving it. I will have more info about it when I am closer to actually shipping (not even close now).