Langchain UI for Mac - does this exist?

Just checking before I re-invent the wheel

I would like to use LangChain to summarize PDFs on my Mac

I have read the LangChain docs and also have found some articles with suggested starter scripts - such as Build an AI-Powered PDF Summarizer with LangChain and OpenAI 🤖📝 | by shub.codes | Medium

Has anyone created a Mac app - either commercial or open source - with a nice UI to handle file selection, running LangChain, and displaying/storing the output?

Or do I need to do that part myself?