What a UI agency costs and how the pricing works
UI agencies price in three main ways: a fixed price for a defined scope, a monthly retainer, or time-boxed sprints. Few publish their rates, so the useful work for a buyer is understanding what drives a quote and how to compare two of them. This page covers the models, the cost drivers and one published reference point.
How UI agencies price their work
Almost every proposal you receive will use one of four models, or a mix. None is cheaper by nature. Each moves risk between you and the studio in a different way.
| Model | How it works | Fits when | Watch for |
|---|---|---|---|
| Fixed scope | One price for an agreed list of screens, flows and deliverables | The product is well defined and the screen list is stable | Change requests. Ask what a change costs before you sign |
| Monthly retainer | A reserved team, or a set number of days, each month | You have a live product with a steady stream of interface work | Unused days. Check whether they roll over |
| Design sprints | Time-boxed blocks, often one or two weeks, each with a stated goal | Scope is still moving, or you want to test the studio before a larger commitment | A sprint buys time and focus, not a guaranteed outcome |
| Time and materials | Days billed at agreed rates as they are used | Discovery work and open-ended collaboration with your own team | It needs a budget cap and weekly reporting |
What drives the cost of UI design
Two quotes for the same product can differ by a wide margin because the studios counted different things. These are the variables that move the number most.
- Unique screens and states. Forty screens that share ten layouts cost far less than forty one-off designs. Empty, loading and error states belong in the count.
- Platforms. Web, iOS and Android each follow their own conventions, even when they share a design language.
- Design system depth. A tidy Figma library is a different job from tokens, coded components and documentation.
- Motion and interaction. Prototyped transitions and micro-interactions add specialist time.
- Brand work. If the identity has to be created or reworked before the interface, expect a separate phase.
- Seniority and location. Senior-only teams and studios in high-cost cities charge more per day, and often need fewer days.
- Build. Some studios stop at design files. Others ship production front-end code, which changes the size of the contract.
One published reference point
Most studios on our list keep prices private. Sparkbox is an exception. It states that a typical engagement uses a team of two to four people and costs between $150,000 and $250,000 per quarter.
That figure is for design system work at organisational scale. Treat it as a marker for the specialist end of the market, not as the going price for a small product. Smaller studios working on a single product generally quote below that level, and multi-market agency programmes can exceed it.
What a good quote itemises
A one-line price tells you nothing. Ask for a quote that lists the following, so you can compare studios on the same basis.
- The number of flows or screens, including states
- Revision rounds included in the price
- Named team members and the days allocated to each
- Deliverables: Figma files, prototype, component library, specifications, code
- The accessibility target, for example WCAG 2.2 AA
- Handover and support after delivery
- Ownership of files, plus licences for fonts, icons and illustration
How to keep the budget under control
Start with the smallest piece that proves the direction: one core flow, designed and prototyped to finished quality. It shows how the studio works and gives both sides a reference for pricing the rest.
Agree the component inventory early. Reuse is the main lever on cost, and it only works when everyone can see the list.
If the same team could build the interface, ask for design and build in one quote. Splitting them between two suppliers tends to hide the cost of handover and rework. Design-plus-build studios, BlackCard among them, price this way by default.
Common questions
Why do so few UI agencies publish prices?
Scope varies too much for one number to be honest. A five-screen marketing site and a 200-screen B2B platform are both called UI design. Agencies that do publish, such as Sparkbox, tend to sell one well-defined kind of engagement.
Is a retainer cheaper than a fixed-price project?
Not by itself. A retainer usually has a lower day rate in exchange for commitment, but you pay for the capacity whether or not you use it. It pays off when you have a continuous backlog of interface work.
Should design and development be in one contract?
For small and mid-size products, usually yes. One contract means one team is accountable for the result on screen. Separate contracts make sense when you already have a strong in-house engineering team that only needs design input.