The terms get used interchangeably, but a UI/UX design agency and a web design agency are genuinely different animals. Knowing which is which will save you from hiring the wrong one.

A web design agency builds websites. That's the core of it. They're good at making visually attractive, functional pages using tools like WordPress, Webflow, or Squarespace, and they usually bundle design and development together so you walk away with a live site. What you typically don't get is much digging into how your users actually think or behave.

A UI/UX design agency works differently. Before anyone touches a design tool, they want to understand your users. what those people are trying to do, where they get frustrated, what assumptions they bring with them. That means stakeholder interviews, user research, persona development, journey mapping, and information architecture work, all before wireframes or prototypes enter the picture. It's slower up front, and deliberately so.

The outputs are different too. A web design agency gives you a finished website. A UI/UX agency gives you research reports, user personas, journey maps, wireframes, high-fidelity prototypes, interaction specs, and design systems. Lots of those assets work across multiple products and platforms, not just a single site.

Scope is another real difference. Web agencies mostly stay in website territory. UI/UX agencies work across mobile apps, SaaS platforms, enterprise software, e-commerce, and products with complicated multi-touchpoint flows where getting the experience wrong is expensive.

That said, the gap is closing. Plenty of web agencies have started weaving UX practices into their process, which is genuinely good news. But when you're evaluating anyone, ask them directly: what does your research process look like? How do you validate design decisions? Do you run usability testing? A web shop that added a UX step to its checklist will answer those questions very differently than an agency where that work is the whole point.