User interface is the most important thing when we talk about the beautiful part on front-end, and choose the right package for your project is very important too, and according to the project that currently you are working is important to set a list of features you need, could be features like dark mode, components to handle calendar dates, the freedom to customizing it or simply cause the library likes you and that's it

Next UI

Mantine

Radix UI

All of them have pro features like:

• Dark mode
• fully customizable
• Open source