Bubble

Building a web application without writing code is the job Bubble takes on. You assemble the app in a visual editor, which makes it a no-code platform for people who want a working product quickly and have no developer on hand.

The category tags point to chatbots, AI characters and roleplay, so one use is putting together a chat-style app around those ideas.

Bubble is built for rapid application development, and you can customize it heavily.

Hosting is scalable, and a large community and plugin ecosystem gives you ready-made pieces and people to ask when you get stuck.

Bubble can get complex once your use case turns advanced, and performance can be a concern for very large applications.

You also depend on Bubble's platform, so the app lives there rather than on infrastructure you control.

For prototypes and small to mid-sized products, that tradeoff is often acceptable.