3–5 days
Flow and behaviour audit
We review existing flows and components and list every missing state, inconsistent transition and unclear feedback message.
Interaction design agency
An interaction design agency for products that feel effortless
Flows, micro-interactions, states, and motion that make every action clear, responsive, and satisfying to use.
Trusted by teams at
- Senior designers only
- NDA before the first call
- Reply within 1 business day
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In shortAn interaction design agency defines how a digital product responds to every user action through user flows, micro-interactions, user interface (UI) states and motion design. Our interaction design engagement takes 4–8 weeks, costs $25,000–$60,000, and ends with an interactive prototype and motion specifications for developers.
Definition
What is interaction design?
Interaction design is the discipline that defines how a digital product responds to user input, including the triggers, feedback, states and transitions of every control. Interaction designers specify what happens on tap, click, hover, drag, error and loading, and how long each transition lasts.
Interaction design differs from visual design in focus: visual design sets colour, type and layout, while interaction design sets behaviour over time. An interaction design agency works inside a wider product team, for example alongside digital product design services for a new product, and sizes targets with Fitts's law.
- Timeline
- 4–8 weeks
- Investment
- $25,000–$60,000
- Deliverables
- 6 included
What's included
What does an interaction design agency include?
Our interaction design agency services include 6 deliverables: interaction flows, a micro-interaction library, UI states, a motion system, an interactive prototype and developer motion specifications.
Interaction flows
Flow diagrams map every trigger and response, for example form submission, undo and multi-step checkout.
Micro-interaction library
Each micro-interaction is defined by trigger, rules, feedback and loops, for example a like button, a toggle and pull-to-refresh.
UI states
Every component gets a full set of UI states, for example default, hover, focus, pressed, disabled, loading, empty and error.
Motion system
Duration and easing tokens standardize transitions, for example the Material Design 3 short durations of 50–200 ms for small feedback and medium durations of 250–400 ms for larger transitions.
Interactive prototype
A high-fidelity prototype in Figma or ProtoPie shows real behaviour, for example conditional logic, variables and gesture input.
Developer motion specifications
Lottie or Rive files and timing tables go to engineering, for example exact duration, easing curve and delay per transition.
Process
How does the interaction design process work?
The interaction design process takes 4–8 weeks (20–40 working days) and runs in 5 steps, from flow audit to developer handoff.
5–10 days
Interaction flows and states
Designers map triggers and responses for each flow and define the UI states of every component in Figma.
5–10 days
Micro-interactions and motion system
Designers define duration and easing tokens and design each micro-interaction with a reduced-motion variant for users who set prefers-reduced-motion.
4–10 days
Prototype testing
5 users per round complete tasks in the interactive prototype, and designers adjust timing and feedback after each round.
3–5 days
Developer handoff
We hand over motion specifications, Lottie or Rive files and state documentation in Storybook, then review the built interactions with engineers.
Benefits
What are the benefits of interaction design?
Interaction design has 4 benefits: it increases task completion rate, improves perceived responsiveness, reduces development rework time and develops consistent product behaviour.
Increases task completion rate
Clear feedback on every action shows users what happened and what to do next, which increases the share of users who finish each task.
Improves perceived responsiveness
Visible feedback within 100 ms of each tap or click improves the sense that the product reacts instantly.
Reduces development rework time
Exact duration, easing and state specifications reduce the time engineers spend guessing behaviour and reworking animations.
Develops consistent product behaviour
A shared micro-interaction library develops consistent behaviour across teams, so the same control reacts the same way on every screen.
Comparison
Interaction design vs design systems
Interaction design defines how components behave; a design system packages components, design tokens and governance rules so teams reuse the components. Interaction design output, for example motion tokens and UI states, feeds directly into the design system.
| Criterion | Interaction design | Design system |
|---|---|---|
| Focus | Behaviour, feedback and motion | Reusable components and tokens |
| Main output | Interactive prototype and motion specifications | Component library, tokens and documentation |
| Owner after handoff | Product designers and engineers | Design system team |
| Timeline | 4–8 weeks | 8–16 weeks |
| Price on this site | $25,000–$60,000 | $60,000–$180,000 |
Related:design system servicesdigital product design services
Pricing
How much does interaction design cost?
Interaction design costs $25,000–$60,000 and takes 4–8 weeks. The price depends on 4 factors: the number of user flows, the number of components, the number of platforms and the number of prototype testing rounds.
An interaction design project for 1 platform, 3–4 user flows and 20 components sits near $25,000. A web and mobile project with 10 user flows, 60 components, a full motion system and 2 testing rounds sits near $60,000. Gesture-heavy iOS and Android work runs through mobile app UI UX design services.
Typical investment$25,000–$60,0004–8 weeks
- Interaction flows
- Micro-interaction library
- UI states
- Motion system
When to hire
When should a product team hire an interaction design agency?
A product team should hire an interaction design agency in 5 situations:
- Users report that the product feels slow, if load times already meet the performance target.
- Users tap buttons twice, if buttons and forms show no feedback.
- Engineers build animations by guesswork, if no motion specifications exist.
- Components behave differently across screens, if each team designed its own states.
- An accessibility review flags motion issues, if animations ignore Web Content Accessibility Guidelines (WCAG) 2.2 success criterion 2.3.3.
Not sure where your design problems actually start?
Book a 45-minute UX audit session. We review your product and identify the top three friction points.
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We design UI and UX for SaaS, Healthcare, Gaming and AI products.
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Send us your project. A design lead reviews it and schedules a call within one business day. We sign an NDA before the first technical discussion if you prefer.
FAQ
Interaction design FAQs
These answers cover the 5 questions buyers ask most about an interaction design agency.
Still have a question?
A design lead answers every message within one business day.
Talk to a design leadDoes an interaction design agency design animations?
Yes. An interaction design agency designs micro-interactions and screen transitions and delivers each animation as a Lottie or Rive file with a timing table.
Is interaction design the same as UX design?
No. Interaction design is one part of user experience (UX) design: UX design also covers research, information architecture and content, while interaction design covers behaviour, feedback and motion.
Can motion design meet accessibility requirements?
Yes. Motion design meets WCAG 2.2 when every non-essential animation has a reduced-motion variant triggered by the prefers-reduced-motion setting.
Which tools does an interaction design agency use?
An interaction design agency uses Figma for flows and UI states, ProtoPie for advanced prototypes, and Lottie or Rive for production animations.
How long does an interaction design project take?
An interaction design project takes 4–8 weeks, which equals 20–40 working days, from flow audit to developer handoff.