I think "vibe coding" will not replace developers in the short term, but it will be the strongest competition for such simple systems. I asked a few LLMs to make apps like these (plain HTML with embedded JS), and they got it right after a few edits. They are also visually more appealing [1].
[1] https://claude.ai/public/artifacts/bb451732-9559-401a-8000-b...
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