This is going to be harsh, but I'm in the mood:
I don't think there is a strong correlation between the age at which somebody spells his first words and later academic success.
I guess if you put in the time you can teach any reasonably smart three year old a trick or two, but wouldn't they be able to learn that more quickly at the age of 6 or 7?
One of the things that helped me a lot during my studies was the ability to mentally vizualize complex topological situations. I don't think that's a skill you get from educational apps or from being able to spell your name at 8 months.