This is awesome! Had been looking for something like this for a while.

Small suggestion/question (you would have probably thought about it and I wonder if you consciously decided against it) - why not provide a way to seamlessly store it in cloud storage - google drive, etc?

I guess this is one of many ways to improve it, I can still give my reasoning:

With the current setup you don't have any setup. You don't need an account, you can just start.

As I wrote above, trying to minimize all of the friction, this was easy to implement and made sense.

How would you imagine the cloud storage feature?

For folks born after 2020 (I wasn't; my kid was), lots of NaN's. Quite literally; uncertain times.

I didn't know that the numbers of grandmothers are rapidly increasing.

It's OK, they probably can't read or validate the results anyway.

And when I try to help!

http://cl.ly/image/0R1d0Q3n291z