Some of what people call UX is presentation — readability, hierarchy, tap targets, focus states — and that generates well. The rest is research about your users, and no tool has access to it.
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UX covers both what a product does and how it presents itself. The second half is largely mechanical and automates well; the first depends on knowing your users and doesn't. Conflating them is how tools in this category oversell.
The half that generates well
Text large enough and spaced enough to read. Contrast that holds up outside a dark office. Tap targets big enough for a thumb. Visible focus states for keyboard users. Layouts that reflow rather than requiring horizontal scrolling. A visual hierarchy that puts the primary action where the eye goes first.
These have known-good answers and don't depend on who your users are, which is exactly why generation handles them reliably.
The half that doesn't
Whether your checkout has one step too many. Whether the term you use for your product is the term your customers search for. Which objection stops people converting. What people expected to happen when they clicked.
These require talking to users or watching them. No generator has that information, and copy that implies otherwise is selling you something.
Doing the first half first is still rational
Presentation problems obscure behavioural ones. Session recordings on a page with poor hierarchy mostly show people struggling to read it, which tells you little about your flow.
Fixing the mechanical layer cheaply, then researching, is a better sequence than researching a page that's hard to use for reasons you could have removed in an afternoon.
Common questions
Can AI do a UX audit?
It can address the mechanical issues an audit would flag — contrast, text size, hierarchy, focus states. It cannot tell you what your users are trying to do, which is the substance of a real audit.
Will a UX redesign improve conversion?
Readability and hierarchy plausibly help. Whether they help on your page is a measurement question, and anyone quoting you a percentage is guessing.
Do I still need user research?
For anything about flows, terminology or objections, yes. Generation doesn't substitute for it.
Does the output meet accessibility standards?
It addresses several common failures — contrast, text size, focus visibility, labelled fields. Conformance to a standard requires testing your whole site, including behaviour a generator doesn't control.
Fix the mechanical layer this afternoon, then spend your research budget on the questions that need it.