LangUI

LangUI costs nothing, and that covers personal and commercial projects alike. It is an open source library of Tailwind CSS components built for AI and GPT interfaces, the kind of chat screens and prompt layouts you would otherwise assemble by hand.

If you build with Tailwind, LangUI is a practical shortcut for getting an AI front end on screen quickly.

The components are responsive and customizable, and they support both dark and light mode.

LangUI has zero dependencies, so adding it to an existing Tailwind CSS project should not pull extra packages into your build.

You copy what you need and adjust the styling with the utility classes you already know.

The collection is smaller than what some paid component libraries offer, so you may hit gaps if your interface goes beyond typical AI chat patterns.

You also need to be comfortable with Tailwind CSS, because customizing anything means working directly with its classes.

For developers who want free, no-strings building blocks for a GPT project, that trade is reasonable.

Teams that want a huge catalog will likely outgrow it.