Show HN: Podium, presentation rehearsal with coaching

I'm horrible at presenting, so it (Claude) built a simple application to practice it with. Hearing myself, a mumbling crowd, rehearsing and discussing the content with the agent, while adapting the presentation seems useful to me. Didn't try the other personas yet. Feel free to try: https://code.garage44.eu/jeroen/podium (needs an openai api key)