Check out our continuously improved developer playground.
We offer two different projects:

Utility test pageUtility skeleton
UIStyledNot styled
PurposeClone this repository to test your Utility configurationFork this repository to build your own user interface

To get started just clone the repository, install dependencies and start the project.

git clone utility-test-page
cd utility-test-page
npm install
npm start
git clone utility-skeleton
cd utility-skeleton
npm install
npm start

PS: If you don't want to clone the repository to test Whal3s, check out the Demo page.