First off, welcome to the OpenAI community @julian2001!
You can use any framework that allows you to call the API endpoints, including Flask or Django. I personally have a project going that uses Django as the webserver and uses Celery to initiate tasks that calls the OpenAI API endpoints under each individual user.
I had plans to make it a full-stack business-grade OpenAI instance for everyone to use for free once I get it working, and maybe I still can here soon, but I’ve unfortunately had to put the project on hold for the time being since I have personal matters that have taken precedence currently.
Feel free to reach out to me if you (or anyone else here) plans to use Django for their project. I can certainly help!