I suggest to change the title to something like "Taku: a better way to communicate with users" or "Taku: a widget to communicate with yours users".

I don't understand how it can be a widget in the webpage and in the app. Are you shipping two versions? Which framework do they use?

Email has the advantage that it can be send to people that didn't visit your site and perhaps forgot about it, in spite they may mark it as spam.

It's usually better to wait to post it here until it's available, and it looks like you are only building a waiting list. But IIUC the thing of the right is a live demo, so it's not yout vaporware or an idea without any implementation.

What happens if I press the button "Subscribe to Launch"?