Read Up - look up a book’s reading level

Good idea in theory, but I have never been able to get it to work, despite following the troubleshooting steps.

This extension was great for the first year I used it but now it won't work at all. I've followed all the directions to stop it from continually loading to no avail.

I was really excited to use this resource because another popular website has a very limited catalog even though it is free for users. I took a while for the extension to begin working on amazon, so I decided to try another site. In no time, it was up and running successfully. I was happy because I was able to label about 4 titles that I was unable to find previously. However, I came across leveling information that was obviously inaccurate for one of the titles in my collection. The book title is "I'm A Leprechaun" by Mallory C Loehr. The Read Up information labeled it as having a Guided Reading FP of U! This book is for preschoolers and there is no way that a book with its characteristics can have such a high guided reading level; especially with using the Fountas and Pinnell system. I was disappointed because it made me questions the results I received for the four previous titles that I was able to level on using the app. Overall, if the information can't be trusted, it becomes less convenient and helpful than what it's advertised as being.