What Is AI Slop? A Plain-English Guide for Builders

AI slop is low-quality digital content made with AI, usually in bulk, that nobody asked for and nobody cared enough to check. In 2025, Merriam-Webster chose "slop" as its Word of the Year and Macquarie Dictionary chose "AI slop". For a builder, the useful part is that slop describes missing care, not the tool you used.

Maybe someone called your app slop, or you met the word online and wondered whether it applies to you. This guide gives the definition, the history, and what the word means when the thing in question is a website or web app. If you want to check your own site, our 20-minute self-check walks you through it.

What does AI slop mean?

2 dictionaries picked a slop word for 2025, and they define it a little differently.

Merriam-Webster chose plain "slop". It defines the word as digital content of low quality that is "produced usually in quantity by means of artificial intelligence" (page dated 14 December 2025 in its metadata, read 5 October 2026, Merriam-Webster).

Macquarie Dictionary chose "AI slop". It describes low-quality content created by generative AI, often containing errors, and "not requested by the user" (page dated 24 November 2025, read 5 October 2026, Macquarie Dictionary).

Put those together and you get 4 ideas:

• Low quality. It is weak, wrong, or empty.
• Volume. There is a lot of it, usually made in quantity.
• Unrequested. Nobody asked for it.
• Unchecked. Nobody reviewed it before it went out.

The first 3 come from the dictionaries. The fourth comes from Simon Willison, who we meet below, and it is the idea that makes the word useful to a builder.

Where did the word slop come from?

The word is old. The newer meaning is recent. Here is the timeline, using only what the sources say:

• 1700s. Merriam-Webster says the original sense of "slop" was "soft mud".
• 1800s. It came to mean "food waste" (as in "pig slop"), and then more generally "rubbish" or "a product of little or no value" (same Merriam-Webster page).
• 8 May 2024. Programmer Simon Willison blogged about a tweet from @deepfates that described "slop" becoming a term of art for unwanted AI-generated content (Simon Willison's Weblog, posted 8 May 2024, read 5 October 2026). He said he was very on board with it, and called sharing unreviewed AI-generated content with other people rude.
• 24 November 2025. Macquarie Dictionary named "AI slop" its 2025 Word of the Year.
• 2025. Merriam-Webster's human editors named "slop" its 2025 Word of the Year. The page's metadata lists 14 December 2025 as its publication date.

Notice what changed. A word for mud and food scraps became a word for a feeling about screens, and the feeling is about care.

Is slop the same as spam, or just sloppy work?

Not quite. The spam comparison comes from the tweet Willison quoted and endorsed. It said "slop" was becoming the term for unwanted AI-generated content the way "spam" became the term for unwanted email. Willison added a limit of his own: not all promotional content is spam, and not all AI-generated content is slop. His test for slop was content that is mindlessly generated and thrust upon someone who did not ask for it.

So spam is about being unwanted. Slop, on Willison's test, needs 2 things at once: nobody thought about it, and somebody got it anyway.

"Sloppy" is a different thing. It is an ordinary word for careless work of any kind. A hand-built site with a broken footer is sloppy, but it is not slop in the dictionary sense, because no AI or mass production is involved. They meet in a builder's life because the cause is often the same: nobody looked.

Does building with AI make something slop?

No. Willison's own line is that not all AI-generated content is slop. Google's guidance on generative AI content says something close for search. It says generative AI can be useful for researching a topic and adding structure to original content. But using AI tools to generate many pages without adding value for users may violate its spam policy on scaled content abuse. It also says to manually fact-check and review AI-generated content for accuracy before publishing (page updated 1 October 2026, read 5 October 2026, Google Search Central).

Both point at the same dividing line. It is not the tool. It is whether a person added something real and checked the result.

Is My App Slop is made for that situation: a site or app built with Lovable, Bolt, Replit, or another AI tool, then put in front of real visitors.

What does slop look like in a website or web app?

For a product, we define slop more narrowly: work that looks generated instead of made. The default template, the vague headline, the button that goes nowhere.

We turn that into six areas, and every app is scored on the same ones:

• Clarity and Promise. Does the headline say what this is in one sentence, and does the rest of the page agree with it?
• Craft and Design Integrity. The tells that a build never got a design pass, such as stock photos, mismatched corner radii, and default icon sets.
• Trust and Legitimacy. The signals a customer checks before paying: a real way to contact you, a current footer year, and actual legal pages.
• Flow and Usability. What happens after someone signs up, clicks buy, or hits a dead end, not just whether the buttons work.
• Mobile and Access. Whether the main action is visible on a real phone screen, without scrolling, pinching, or guessing.
• Conversion and The Ask. Whether the price is shown before the ask, and whether the call to action asks for something specific.

None of these proves a site was made with AI. Plenty of hand-built sites fail the same questions. What our audit looks for is missing care and unexamined defaults. That is a practical stand-in for the word, not a test of how a site was made.

What does slop look like side by side?

Hypothetical example: picture a made-up meal-planning app. Here are 2 versions of the same page.

The first version works. Nothing is broken. It just never says anything a visitor could use or act on. The second is not fancier. It is specific, and someone clearly looked at it as a visitor would.

Why does the word matter to a builder?

Because it moves the question. "Did I use AI?" is the wrong one, and the answer is usually yes. "Did I look at this the way a first-time visitor would?" is the better one, and you can act on it.

It also puts your name on the line. Willison wrote that he is happy to use language models for plenty of things but will not use them to produce slop, because he attaches his name to what he publishes. A site or app works the same way. Whatever you ship is yours, however the first draft got made.

And it is good news in one respect. Slop is a lack of review and specificity, not a lack of talent, and review is something you can add. Our guide on design tips for a vibe-coded app is a good place to start with the visual side.

Is slop a yes-or-no label?

No, and we built our report that way on purpose. Each of the six areas gets its own What works, Slop tells, and ranked fixes, so a strong area and a weak one can sit side by side in the same report. The report also gives a Verdict, a score out of 100, and a Where to start section that names the first fix worth making.

The Slop tells field is where we list the specific problems that signal missing care or a generic default. The point is to give you something to fix, not a label to wear.

If you want to see how those fields read before you decide anything, the sample report is free to read. To see what scanning tools can and cannot tell you, read our guide to AI slop detectors.