Mobile App Design Services for iOS and Android
Mobile app design for flows that must work in one hand
We design focused iOS, Android, and cross-platform product flows around real devices, interruptions, permissions, accessibility, and engineering constraints. This specialist page should ultimately merge into the broader UX/UI design service: mobile delivery changes the design checks, but not enough of the buying decision to justify a separate long-term URL.
Bring the problem, the current workflow, or the existing code. We reply with a practical next step within one business day.
The brief
Start with what is not working.
Good software decisions begin with the constraint, not a list of features or a preferred technology.
Desktop wireframes have been compressed into small screens without resolving navigation, keyboard, permission, gesture, or offline states?
Product and engineering teams disagree about native conventions, shared components, accessibility, and what must be tested before build?
Plain answer
Mobile app design turns a defined user journey into accessible, testable iOS and Android interfaces. RaftLabs scopes one critical flow, prototypes it on representative devices, tests interaction and edge states, then prepares an engineering-ready design system and acceptance notes. A focused engagement starts at $20,000 and usually takes six to ten weeks.
The happy path fit the phone. The real day did not.
A field user lost signal after entering a long form. The app returned to an empty screen, while the desktop prototype had never represented a keyboard, interruption, or offline state.
Mobile design starts where the tidy frame stops.
Mobile design is a constraint set, not a smaller canvas
A useful mobile experience accounts for reach, attention, keyboards, permissions, operating-system behaviour, assistive technology, variable networks, backgrounding, and small moments of uncertainty. It also respects product rules and the limits of the planned build.
This page addresses design evidence and interaction specification. UX/UI design covers the broader product-design decision, while mobile app development covers production architecture, implementation, release, and operation. Because buyers often need both together, this specialist URL is a MERGE candidate rather than a separate permanent offer.
A bounded design decision before a larger build
- Critical journey first
- 1
- One audience, measurable question, and representative device context
- Indicative design weeks
- 6-10
- After users, product rules, and technical constraints are available
- Starting investment
- $20K
- Fixed after research, platforms, states, and handoff scope are known
These are engagement parameters, not evidence that a design will increase conversion, retention, ratings, or revenue. Results depend on the proposition, traffic, production quality, performance, support, measurement, and decisions made after launch.
Use focused mobile design when one interaction decision blocks confident delivery.
Use the wider product-design or development engagement when the problem includes positioning, service design, architecture, or the whole release.
A specific mobile journey has material usability, accessibility, operational, or commercial risk.
The team can provide representative users, current evidence, product rules, technical owners, and timely reviewers.
There is budget to implement, test, measure, maintain, and improve the resulting design after handoff.
The request is a visual reskin with no user, task, evidence, content, or technical context.
Stakeholders expect a prototype to prove market demand or replace production accessibility and quality assurance.
The product scope, platform choice, data rules, or core proposition are still unresolved and need broader discovery.
Focused scope
What the mobile design engagement can resolve
- 01
Journey and information structure
Define the task, entry points, navigation, hierarchy, progressive disclosure, form sequence, confirmation, and recovery. Keep each screen accountable to a user decision rather than filling a template with features. - 02
Platform and device behaviour
Account for iOS and Android conventions, safe areas, screen sizes, keyboards, rotation where relevant, permissions, deep links, notifications, biometric prompts, and supported device capabilities without inventing parity. - 03
States accessibility and content
Design loading, empty, error, disabled, offline, timeout, interruption, and destructive-action states. Specify focus, target size, contrast, text scaling, labels, feedback, reduced motion, and concise interface language for review. - 04
Prototype evidence and handoff
Test the riskiest flow with representative participants, document observations and open questions, then give engineers components, behaviours, tokens, assets, acceptance notes, and access to design review during implementation.
Choose the smallest design path that answers the decision
| Approach | Best fit | |
|---|---|---|
| Focused mobile design | Research, prototype, and specify one critical app journey | A bounded interaction risk must be resolved before build. |
| Product UX/UI design | Shape connected journeys, service rules, and a wider design system | The decision spans web, mobile, operations, and product strategy. |
| Design inside app development | Design and engineer one release through a shared delivery team | Scope and technical direction are clear enough to build iteratively. |
| Internal design team | Own continuous discovery and product evolution | The organisation has stable demand, leadership, research access, and capacity. |
Prototype fidelity should match the question
A rough flow is enough to test terminology, order, and whether people know what to do next. A realistic prototype is useful when gestures, transitions, permissions, content density, or trust cues affect the decision. Neither is production software. We state what the prototype can and cannot demonstrate.
Testing also needs a decision rule. Five sessions are not automatically sufficient, and a polished screen is not automatically usable. Recruitment quality, task realism, observed behaviour, accessibility coverage, and the cost of a wrong conclusion determine the method. Where regulated or safety-sensitive tasks are involved, qualified specialists and a broader verification plan remain necessary.
Delivery
From risky journey to tested mobile handoff
Four phases connect user evidence, device constraints, product rules, and implementation ownership.
- Phase 101
Frame the mobile decision
Define the user, critical journey, business rule, platform targets, device conditions, evidence, accessibility needs, technical constraints, and success question.
- Phase 202
Map states and interaction
Design information structure, navigation, permissions, input, feedback, interruption, empty, error, loading, offline, recovery, and cross-device states.
- Phase 303
Prototype and test on devices
Build a realistic prototype, run focused sessions on representative devices, record observable friction, and revise the riskiest decisions.
- Phase 404
Specify and transfer the system
Deliver approved screens, components, tokens, assets, behaviour notes, accessibility expectations, edge cases, and a review loop with engineering.
Design boundaries
Decisions to settle before implementation
- Platform consistency
- Decide which patterns should remain shared and which should follow iOS, Android, device, or assistive-technology conventions. Shared code does not require identical interaction.
- Accessibility responsibility
- Define target standards, user needs, test methods, content ownership, engineering acceptance, and release review. Design annotations alone do not establish conformance.
- Data and permissions
- Name the purpose, minimum data, consent or other authority, operating-system permission, denial path, retention, security, and accountable owner for each sensitive capability.
- Measurement and change
- Agree events, baselines, quality signals, rollout, experiment limits, support feedback, ownership, and how evidence will change the product after release.
Engagement model
Start with one mobile journey whose risk is worth measuring.
Starting investment
Work with us
Which mobile moment cannot afford a wrong tap?
Bring the target users, critical flow, current evidence, platform targets, device constraints, business rules, technical context, accessibility needs, and release decision.
- Scope and cost agreed before work starts. No surprises. No obligation.
- Working prototype within 3 weeks of kickoff.
- Pay by milestone. You see progress before each invoice.
- 60-day post-launch warranty. Bug fixes, UI tweaks, and deployment support. No retainer.
- All conversations are NDA-protected.
Common questions
Separate it when the team needs evidence before choosing the build, the interaction model is uncertain, or several engineering partners will price the same specification. Keep design inside development when the product team, technical constraints, and release scope are already aligned. Discovery should still include engineering so the design does not depend on unavailable APIs, unsupported gestures, or unrealistic offline behaviour.
Yes. We can design for native iOS or Android and for shared products built with technologies such as React Native or Flutter. The design does not assume that every screen should be identical. We identify where platform conventions, device capabilities, accessibility services, navigation, keyboards, payments, permissions, and store rules require different behaviour. Technology selection and store acceptance remain separate engineering and platform decisions.
We test the critical task, navigation, comprehension, input effort, feedback, recovery, and representative accessibility needs with agreed users and devices. We also review loading, no-data, validation, permission-denied, network-loss, backgrounding, and resumed-session states. A usability test reduces uncertainty; it does not prove that every user will succeed or that the production app will meet commercial, accessibility, or store outcomes.
A typical handoff includes the approved journey, responsive mobile frames, reusable components and states, design tokens where relevant, exportable assets, interaction notes, content guidance, accessibility expectations, and acceptance examples. Engineering joins before handoff and during implementation review. Source files are not a substitute for product rules, API contracts, analytics definitions, security requirements, or production quality assurance.
A focused, single-role mobile flow starts at $20,000 and commonly takes six to ten weeks. Multiple roles, both platform-specific variants, a new design system, extensive research recruitment, tablet layouts, regulated review, hardware interaction, localisation, or a large legacy redesign add scope. The proposal separates research incentives, travel, development, third-party tooling, content production, legal review, and ongoing design support.