It's using Gradio, which is what auto1111 also uses. Both of these are pretty heavy modifications/extensions that do a lot to push Gradio to it's limits, but that's package being used in both. Note, it also has an api (checkout the --api flag I believe), and depending on what you want to do there's various UIs that can hook into the Text Gen Web UI (oobabooga) API in various ways.
It's using Gradio, which is what auto1111 also uses. Both of these are pretty heavy modifications/extensions that do a lot to push Gradio to it's limits, but that's package being used in both. Note, it also has an api (checkout the --api flag I believe), and depending on what you want to do there's various UIs that can hook into the Text Gen Web UI (oobabooga) API in various ways.