Two important aspects for developing a good theme are how quickly you can see your changes on the screen and how easy it is to replicate a production environment locally.
Keycloakify provides two ways to test your theme:
Testing Outside of Keycloak
Keycloakify enables you to test your theme without requiring a real Keycloak instance to be involves.
This approach let you preview the pages in different configurations using mock data.
This is great for getting realtime feedback when designing your page and having a quick overview of how your theme looks like as a whole.