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Can AI Copy It?

Can AI copy

Craigslist

Classified ads, in blue underlined text, largely unchanged since the last century.

Nice try
Verdict
Nice try
Time to copy
you won't
Category
◎ Marketplaces & community
Source
Proprietary

The prompt

Written to be pasted straight into an agent with no editing. It describes the whole job, including the parts that will go wrong.

Build a geographic classifieds site. City subdomains, a category tree, free text posting with images, search with filters by price and distance, listing expiry after 30 days, and community flagging. Keep the markup plain and the pages under 50KB. Do not add a recommendation algorithm.
Open inClaude ↗Terminal agents take it from the clipboard.

What copies cleanly

  • The entire front end, in about twenty minutes, including the parts people mock.
  • Categories, search, posting flow, expiry, flagging. None of it is hard.
  • It is arguably the least technically impressive site of its size on the internet.

Where it stops

  • You will finish the copy and stare at an empty city.
  • A classifieds site with no listings is not a worse product than Craigslist. It is not a product.
  • Every listing is worth something only because a buyer might see it, and buyers only arrive because listings exist.

What actually protects them

  • A two-sided network, per city, built over twenty-five years.
  • Habit so deep that the ugliness reads as trustworthiness.
  • Nobody has beaten it by building a nicer one, and many have tried with real money.

Editor's note

The single clearest demonstration on this index that copyable and beatable are unrelated properties. You can have the whole codebase. You cannot have the sellers.

Go and look at the original

We would rather you formed your own opinion than took ours. They built the thing; we only measured it.

craigslist.org ↗

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