From the Logojoy How it Works page.

    The last step isn’t actually AI – it’s a genetic algorithm. As you ‘favorite’ logos, we apply a natural selection type process to generate more accurate logos as you scroll. Each logo is made up of hundreds of ingredients (ie ‘funky font’, ‘bold color’, ‘logo has a symbol’, etc.) – these are called traits in the context of genetic algorithms.

As others in the thread have already mentioned, the AI referenced in the previous steps seems more like a rules-based algorithm.

I don't know about Logojoy in particular, but every AI begins with some variation of rand(). :)

From https://news.ycombinator.com/item?id=13067481

> Yeah, the ML is still in it's infancy... To address that, I built in some more randomness into the algorithm so the initial logo designs can just get the user thinking and then we can get a better sense of their taste as they favorite logos. Without that randomness, the algorithm tries and fails horribly at creating logos.

Some variation of rand() indeed!

Not sure why you were downvoted, in this case that's a real possibility. It's hard to beat rand() for MVP.