UI UX design agency: the short answer
A UI UX design agency designs how a digital product works and how it looks. UX covers structure, flows and usability; UI covers the visual system built on top. A good agency runs research, wireframes, a design system and usability tests, then hands over something buildable. Expect roughly €5,000 to €15,000 for a full UX engagement in the Netherlands.
That last sentence is the one almost nobody publishes. Search this topic and you get seven pages explaining that UX is the architect and UI is the interior designer, and not a single euro figure. The metaphor is fine. It just does not help you evaluate a quote.
5.0 ★
Viralistic's Google rating across 30 reviews
€120/hr
median Dutch UX agency rate (uxagencies.com, 249 agencies)
12 weeks
typical duration of a focused UI/UX engagement
Herengracht
Amsterdam base, working with Dutch and international brands
What a UI UX design agency actually does
A UI UX design agency turns an ambiguous business problem into a specific, testable interface. That is the whole job. Everything else, the workshops, the personas, the moodboards, is either in service of that or it is theatre you are paying for.
The work splits across two disciplines that are constantly confused with each other, including by the people selling them.
UI vs UX: the difference in one table
| UX design | UI design | |
|---|---|---|
| Core question | Does this work, and does it get someone where they wanted to go? | Does this look right and feel right? |
| Activities | User research, flows, information architecture, wireframes, usability testing | Colour, typography, icons, components, states, motion |
| Output | Sitemap, user flows, wireframes, clickable prototype, test findings | Design system, screen designs, component library |
| Fails when | People drop out, or call you with questions the product should have answered | The brand reads cheap, or nobody can find the next action |
| Measured by | Conversion, task completion, drop-off per step, support volume | Brand perception, consistency, recognisability |
Figma puts it plainly: UI is a specialised part of UX, not a parallel discipline. In practice most agencies staff hybrid UX/UI designers, and for the majority of projects that is the right call. Splitting the roles pays off once the product gets genuinely complex, a portal, a configurator, a SaaS application with real state.
The UI UX design services worth paying for
Agency websites list a dozen service names. Only some of them change your numbers. Here is what belongs in a serious scope, and what tends to be padding.
Interviews with your customers, your sales team and your analytics. Usually the shortest line on the quote and the one that prevents the most expensive mistakes. Skip it only when the product is genuinely simple.
The sitemap and the flows. This is where redundant pages die and where the structure your search visibility will later rest on gets decided. Design and SEO share this artefact whether anyone admits it or not.
Greyscale layouts, no brand, no colour. They force the conversation onto hierarchy and content instead of the shade of blue. Cheap to make, cheaper to throw away when they are wrong.
Not a set of pretty screens but components with states, spacing rules and tokens. This is the difference between a build that matches the design and a developer inventing the other 60 percent alone.
Five people, real tasks, no coaching. Jakob Nielsen's finding still holds: five testers surface most of the serious problems. This is the line agencies quietly drop to look cheaper than the competition.
Annotated files, a component inventory, and a designer who stays reachable during the build. Without it you get a beautiful file and a website that resembles it from a distance.
Two more belong on the list and rarely appear. Accessibility, because since 28 June 2025 the European Accessibility Act applies to many commercial digital services in the EU, and contrast, focus order and keyboard operation are UX work by any definition. And performance budgets, set during design rather than discovered after launch.
Why UX is a conversion lever, not decoration
UX design pays for itself through behaviour, not taste. Every step you remove from a form, every ambiguity you resolve, every second you shave off load time changes how many people reach the end. That is arithmetic, not a design philosophy.
The honest distinction: UX and conversion rate optimization overlap but are not the same thing. UX work fixes structural problems, the ones you cannot A/B test your way out of because the entire flow is wrong. CRO then optimises within that structure. Run CRO on a broken flow and you are testing which of two bad options is less bad.
Speed belongs in this conversation and is almost always filed under engineering instead. Google now measures experience explicitly through Core Web Vitals: how fast the largest element paints, how quickly the page responds to input, and whether the layout shifts under someone’s thumb. Those are UX failures with technical causes. A design handed to a developer only after it is finished loses points here by default.
When you need a dedicated UX design agency, and when you do not
Not every project justifies a UX engagement, and any agency claiming otherwise is selling hours. The honest split comes down to how many decisions a user has to make.
A brochure site, a services page, a portfolio. Linear content, one clear action, a pattern visitors already recognise. The wins here come from clarity, speed and copy rather than research. A six-week discovery phase rarely pays for itself on work like this.
A booking flow, a configurator, a customer portal, an ecommerce journey with real choice. The moment there is a sequence that can break, research earns its fee back before the build starts.
There is a third case people rarely name. You already have a site, it looks perfectly good, and it still does not convert. A redesign is usually the most expensive answer to the wrong question. Start with five usability tests and your analytics. The culprit is often one form field, one missing price anchor, or one page that never answers the question buyers actually have.
What a UI UX design agency costs
Indicative market ranges, not a quote
The figures below come from published 2026 market data, not from a Viralistic price list. Use them to sanity-check proposals you receive. Scope, research depth and whether a design system is delivered drive most of the variance.
| Engagement | Indicative range | Source |
|---|---|---|
| Standalone UX audit | €1,500 to €5,000 | stuurlui.nl (2026) |
| Full UX engagement via a freelancer | €3,000 to €10,000 | stuurlui.nl (2026) |
| Full UX engagement via an agency | €5,000 to €15,000 | stuurlui.nl (2026) |
| Research-backed audit with analytics and moderated tests | €8,500 to €13,000 | uxagencies.com, Dutch median |
| Full redesign | €15,000 to €75,000 and up | uxagencies.com (249 agency rates) |
Hourly, Dutch freelance UX rates run from about €50 for a junior to €125 for a lead, according to Freelapp’s analysis of 12,835 live assignments. The median Dutch agency rate sits near €120 per hour on uxagencies.com’s index, placing the Netherlands between Germany at €115 and France at €130, and well below Denmark at €175.
International benchmarks run higher because the projects are bigger. Clutch, working from verified client reviews, puts the average UX agency project at roughly $85,000 across about ten months. Agencies like Musemind publish a starting point of $5,000. Onething quotes eight to twelve weeks for a focused engagement and sixteen weeks or more for enterprise platforms. If a quote lands far outside these bands in either direction, ask what is in it, or what is missing.
How to vet a UI UX design agency
Portfolios are the least reliable signal in this market, because a portfolio is a set of images and images are easy. Ask these instead.
- Can you show me three live URLs I can open right now, not case-study renders?
- Who does the actual work, and will that person be in the kick-off and the handover?
- How many usability tests are in this quote, with how many participants?
- Do I receive a design system with components and states, or flat screen files?
- How many revision rounds are included, and what triggers a change order? Two to three rounds is the Dutch market standard.
- Who builds it, and how does design stay involved during development?
- What happens to accessibility and Core Web Vitals in your process?
- What will you measure after launch, and who reports on it?
An agency that answers all eight without hedging is worth more than one with a prettier Dribbble profile.
Design, build and SEO under one roof
The usual arrangement is a design studio that delivers screens, a developer who interprets them, and an SEO party bolted on afterwards. Every handover costs quality. The design system gets half-rebuilt, load time creeps up, the heading structure the designer liked turns out to be invisible to search, and three parties point at each other.
Viralistic works differently, which is usually why clients come to us rather than to a pure web design agency in Amsterdam. We design, build and optimise on one line. The flow that tests well is the flow that gets built. The design system becomes real components rather than pictures. And the information architecture the UX designer settles on is the same structure that carries organic visibility, including into AI answer engines, where buyers increasingly compare vendors before they ever reach a website.
SilverDrive shows what that looks like in practice: an Amsterdam chauffeur service that grew into an internationally operating brand running entirely on organic findability. Joshua Faerber of SilverDrive put it plainly, in Dutch: “Viralistic begeleidde SilverDrive naar een internationaal gericht bedrijf dat volledig draait op organische vindbaarheid. De website en alle systemen besparen ons enorm veel tijd.” Translated: Viralistic guided SilverDrive into an internationally focused company running entirely on organic findability, and the website and systems save the team an enormous amount of time. That result did not come from beautiful screens. It came from a flow that works, a site that is fast, and a structure search engines understand.
The same discipline runs through our design principles and our premium web design work, and the full build scope is broken down under custom website development.
Frequently asked questions
What is UI and UX design?
UI refers to the look, feel and interactivity of a screen: colour, typography, buttons, icons and motion. UX covers a person’s entire experience with the product, including structure, flows, content, speed and what happens after they submit a form. UI is a specialised part of UX rather than a separate discipline beside it.
What exactly does a UI/UX designer do?
A UI/UX designer researches what users need, maps how they move through a product, draws wireframes, designs the visual system, and tests the result with real people. The output is a set of decisions made visible before they get expensive to change: flows, wireframes, a clickable prototype, a design system, and findings from usability tests.
How much does a UI/UX design project cost?
In the Netherlands, a full UX engagement typically runs €5,000 to €15,000 at an agency and €3,000 to €10,000 with a freelancer, with a standalone audit at €1,500 to €5,000 and a full redesign from €15,000 upward. Internationally, Clutch puts the average UX agency project near $85,000 over roughly ten months. Scope and research depth drive the difference.
How long does a UI/UX design project take?
A focused engagement usually takes eight to twelve weeks; enterprise platforms run sixteen weeks or more. Agencies quoting fifteen days are describing a visual refresh, not a UX process, which can be perfectly appropriate if that is what you need. Ask what happens in each week, because timeline is the fastest way to see whether research and testing are real.
Is UI/UX being replaced by AI?
AI replaces production work, not design decisions. Generating screens, producing variants and writing out components is now fast and cheap. Deciding which problem to solve, which step to remove and what makes a user hesitate remains human work. The practical effect is that the floor has risen sharply while the ceiling has not moved.
Is UI/UX a hard job?
The tools are learnable in months; the judgement takes years. The difficult part is not Figma, it is holding a position on what should be removed while stakeholders argue for additions, and reading behaviour honestly when the data contradicts your own design. That is also exactly what clients are paying an experienced UX design agency for.
What is a UI/UX designer salary?
Rates vary by market and seniority rather than by job title. Dutch freelance UX rates run roughly €50 to €65 per hour for juniors, €65 to €85 for mediors, €85 to €110 for seniors and €95 to €125 for leads, based on Freelapp’s analysis of 12,835 assignments. Designers with research skills consistently sit at the top of those bands.
Weighing up a UI/UX partner?
We design, build and optimise on one line, so the flow that tests well is the one that ranks and converts. Tell us where your current product loses people and we will say honestly what is needed, and what is not.
