Do you design and also build the app?

Design here; build on Android, iOS, Flutter or React Native pages. Same team available.

What do developers get besides Figma?

Specs, tokens, behaviour notes and hit areas. They should not guess.

Is Dark Mode included?

If scoped. It is not free — it is a second pass on colour, elevation and imagery.

How long does app UI take?

A core loop plus system can be weeks to a couple of months, depending on platforms and flows.

Can you redesign an existing app?

Yes. Audit first — then kits. We will not reskin a broken information model.

Do you design for accessibility on mobile?

Dynamic Type, contrast, labels, hit targets. Required for serious products.

Does UI affect store review?

Permission UX is part of design. Greedy prompts fail reviews. Timing and copy are in the kit.

Flutter or native — does it change the design?

Yes. Shared tokens where honest; navigation models still differ. We design to the stack.

Do you design the app icon and store screenshots?

Yes. They are part of the product, not an afterthought the night before submit.

What does mobile app UI cost in London?

Depends on iOS vs Android vs both, stack and core-loop complexity. Share those for a proposal.

Will you QA on real devices?

Yes. We hold the phones — including mid-range Android, not only the newest iPhone.

150+ projects delivered for UK and international brands

Mobile App UI Design in London

A London mobile app UI studio designing iOS and Android interfaces — thumb-first navigation, platform chrome and kits developers can build without guessing hit areas.

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Mobile app UI design for London products — iOS and Android patterns, gestures, type, and components engineering can implement in Swift, Kotlin, Flutter or React Native.

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App UI that respects thumbs and OS conventions

Mobile app UI designed for one-handed use and store review

Design Dev designs app interfaces for UK products: navigation, tabs, sheets, permissions, empty states. We design to Human Interface and Material where it helps, and we spec platform differences instead of pretending one artboard is both stores.Tap targets, keyboards, interruptions, offline — the medium is the constraint. We will not deliver a web layout in a WebView costume.

iOS & Android passes

Two pattern languages, one product. We show the deltas instead of faking one UI.

Thumb-zone navigation

Primary actions where people actually reach. One-handed use is the default.

Components for engineers

Tokens, states, spacing and hit areas. Developers should not guess.

Permission & store UX

Prompts that will not fail review for being greedy. Timing matters.

Our mobile app UI process — from flows to platform kits

Jobs on a phone

What v1 does in a queue or on the sofa. Interruptions and one hand.

Flows

Auth, core loop, settings, empty. The paths that can fail review or drop-off.

OS-specific UI

Navigation and controls per platform. Shared tokens where it is honest.

Prototype gestures

The risky ones — sheets, swipe, permissions — not every settings row.

Dev handoff

Two kits if two OS. Design QA on real devices, not a desktop simulator only.

Mobile app UI is not a shrunk website

Tap targets, keyboards, interruptions, offline — the medium is the constraint. Design Dev delivers platform-aware UI, not a web layout in a WebView costume.Thumb reach, Dynamic Type, safe areas and keyboard avoidance are in the spec. Permission copy is a design deliverable. Store screenshots are too — not an afterthought the night before submit.

Thumb reach
System fonts / Dynamic Type
Safe areas
Keyboard avoidance
Permission copy
Empty states
Haptics/motion with restraint
Dark Mode if in scope

Complete mobile app UI capabilities

Platform-aware app interfaces — iOS, Android and cross-platform kits ready for native or Flutter/RN build.

iOS UI Kits

HIG-aware navigation, type and components.

Android UI Kits

Material-aware patterns, not a stretched iPhone layout.

Cross-platform Kits

Flutter/RN with honest OS passes.

Motion

Meaningful, cheap. Haptics with restraint.

Onboarding UI

Short, skippable, not a five-screen TED talk.

App Icon & Store Art

Part of the product. Screenshots are a deliverable.

Gesture Prototypes

The flows that can fail — sheets, swipe, permissions.

Device QA

We hold the phones. Mid-range Android included.

Permission UX

Copy and timing that survive store review.

Empty & Offline States

The majority of real use, not the happy-path mock.

Dark Mode

If scoped. It is not free.

Existing App Redesign

Audit first. Then kits. See also Android/iOS build pages.

Ready for app UI that is not a desktop layout squeezed down?

Speak with Design Dev about iOS/Android UI kits, thumb-first navigation and handoff for your stack.

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Mobile app UI across key industries

Industry focus

Healthcare

Clinic, patient and product UX with clarity over decoration — booking, portals and content that people can finish when they are stressed.

Patient journeys
Booking UX
Accessible UI
Clinic sites

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Why Design Dev

A London app-design team that specs both operating systems

Design Dev designs mobile UI as a platform craft. Thumbs, OS conventions, permissions and device QA — not a single artboard for “the app”. Partner with a London mobile app UI studio that will show the iOS/Android deltas.

150+

Projects delivered

Years experience

UK+

London & worldwide

Start Your Project

A London app-design team that specs both operating systems

Strategy, design and engineering for brands that need a website that performs.

Research before pixels

Users, jobs and constraints are mapped before a pretty screen exists.

Systems, not one-offs

Components and patterns that survive the next ten pages or screens.

Built to be built

Specs developers can implement without guessing spacing and states.

Support after launch

Design QA and iteration once the product is in real use.

Technologies we work with

Figma

React

Android

iOS

Flutter

HTML5

CSS3

JavaScript

Firebase

Kotlin

Swift

Canva

What clients say

Design Dev transformed our e-commerce platform. Their team was efficient, responsive, and delivered a stunning layout that doubled our conversion rate within a month.

Sarah Jenkins

Vauxhall Marketing - Shopify Development

An absolute pleasure to work with. They understood our brand identity perfectly and designed a clean, user-friendly SaaS platform that our clients love.