I'm pretty sure I found this app listed by a reputable resource.
Here's why it's not yet worthy of accolades...
The app is easy to get, but you also need to pay an annual access fee. It's something like $4.99, be warned, if that is mention in the app description, it could be easy to overlook. ADDING STUDENTS: to add students, you have to add each individually; fine if you have one class, but an inconvenience if you have more. The objective is to track your assignments and use of Common Core Standards. Adding an assignment does not include the ability to write a description of the assignment; it does not allow you score by a rubric; it does not allow you add comments. A lot of work still needs to be done.
12 minute video about English shifts that need to happen to meet the Common Core. David Coleman was one of the architects of the common core and is now president of College Board.
One school districts work aligning information fluency with the new Common Core Learning Standards. Lots of work done here. Are you facing a similar project?
This is a livebiners presentaion from Carolyn Jo Starkey that presents detailed resources on how the Common Core Standards relate to school library media studies.