Method

What is being measured

One thing only: how much of a product a competent coding agent reproduces in a single working session, given a good prompt and someone paying attention. Not whether the result is legal. Not whether it is a business. Not whether you should.

This is a narrow question and the narrowness is deliberate. Almost every interesting product scores well on it and still cannot be taken, and the gap between those two facts is the only thing here worth reading.

The three verdicts

• One shot

  One prompt, one session, a copy you would actually use.

• Skin deep

  You will clone the interface and then meet the wall.

• Nice try

  The moat was never the code.

How an entry is written

1. Use the product properly, not for five minutes.
2. Write the prompt first, before forming a view. If the prompt is hard to write, that is already the answer.
3. Actually run it. The wall list comes from watching where the output breaks, not from imagining where it might.
4. Separate what broke because agents are imperfect from what broke because the problem is genuinely hard. Only the second belongs in the wall.
5. Name the moat plainly, including when the honest answer is that there isn't one.

Where we stand on copying

Reimplementing an idea is how software has always advanced. Copying someone's code, brand, copy or interface is a different act, and this site does neither the second thing nor recommends it.

Every prompt here describes a category of product, not a reproduction of a specific one. Every word of every entry is written from scratch. Nothing here contains anybody's source, assets or page copy, and where a product publishes its own source we link to it and say so rather than quietly absorbing it.

If you are going to build one of these, build it for yourself, or build it better and compete honestly. Shipping a pixel copy of someone's product with the names changed is not a business, and the index is fairly consistent about why: the part you copied was never the part that was worth anything.

Corrections

Verdicts are opinions about engineering scope and they are sometimes wrong. If you have built one of these and the wall was somewhere else, that is the most valuable thing you could send us — open a pull request and say so.