EFY

EFY allows you to customize the design of your html based apps or websites from an UI sidebar menu and combine billions of possible patterns. You can also create, share or import json themes for easier access. All apps that use efy can share the same theme or individual themes.

You control things like the colors, gaps, radius, shadows, background, borders, sounds, transparency, accessibility, etc on all major platforms, browsers & devices, online & offline.

And as a designer or developer you can create a default theme in a css config file that users will see if nothing else is set, but from the menu they will be able to create or import their own. There's also a few free components like a multiple color picker, select menu, timer, clock or notifications that you can add to your apps.

All efy preferences are stored locally in your browser (localStorage and indexedDB) in order to improve the user's privacy and keep it offline.