Show HN: Vibe coded React based flashcard app

I wanted to test vibecoding in a less familiar territory. I have never worked with ReactJS and have limited experience with TypeScript. Therefore, trying out a small frontend-only application seemed like a good choice.

I have a Claude subscription, so I went with Claude Code. Always wanted to create a flashcard application with my own ideas.

Learning so far:

- Use whatever chatbot (Claude/ChatGPT/Gemini) to assemble a specification (if possible with wireframes, I used PlantUML). This will save considerable time.

- If possible, choose a language that supports type checking. Tools like Claude Code can fix errors in an iterative fashion.

- Have a solid testing strategy prepared and vibecode the tests as well. Checking everything manually will consume too much time.

Here is a German course for testing the app: https://charstorm.github.io/repeatrom/?course_name=German+Ba...