Signed up but I haven't done anything with it. I'm curious to read what others write.

I checked it out yesterday. It looked like the lessons I saw were for older grades.

I just found www.learnzillion today. It looks more promising!

www.learnzillion.com

I will check out Learnzillion. Thanks! I was intrigued with Sophia because it looked fairly simple to add your own content. I will have to play more!

Yes, I have attended LearnZillion webinars, and I like what's developing there.