https://DNDEmail.com is do not disturb for your Gmail.
We use Python on Google App Engine. Google's NDB datasource.
The Chrome Extension is written in JavaScript.
Wordpress on wpengine.com for the front-end brochure website.
I've written about how to simplify your MVP stack[https://dndemail.com/2018/01/30/how-to-simplify-your-app-pla...] to speed up launching.