Hi I'm Chris, one of the creators of the Starling. Here's a link to the Stanford research on early childhood language processing if you or anyone else is interested:

https://web.stanford.edu/group/langlearninglab/cgi-bin/publi...

There's more from other research institutions, but Anne Fernald from Stanford's Language Learning Lab is has been an advisor of ours since the beginning.

On affordability, it's not lost on us that the Starling costs less than a single day's tuition at Stanford. We hope to make it more affordable still.