UX (User Experience) design focuses on how the app works — the user journey, information architecture, navigation patterns, task flows, and the structural decisions that determine whether users can accomplish their goals easily. UI (User Interface) design focuses on how the app looks — visual design, colours, typography, iconography, and the aesthetic presentation of the interface. Both are essential: great UX without UI polish feels unfinished; great UI on poor UX is beautiful but frustrating to use. Our mobile app design work covers both, treating them as inseparable aspects of the same design challenge.

iOS and Android have distinct design conventions and interaction patterns — tab bars vs bottom navigation, back gesture handling, typography scales, native component styles — and users of each platform have expectations shaped by those conventions. For most app budgets, we design a single experience that is "platform-aware" — following conventions where they significantly affect usability but maintaining a consistent visual identity across platforms. This is more efficient than fully separate designs and most users accept minor deviations from strict platform conventions in well-designed apps.

We use Figma as our primary design and prototyping tool — industry-standard for mobile app design with excellent collaboration features, component library support, and developer handoff capabilities. For specific needs, we also work with Sketch, Adobe XD, and Principle for advanced animation prototyping. All tools we use produce design specifications and assets in formats that development teams can implement in iOS (Xcode), Android (Android Studio), React Native, and Flutter projects.

Mobile screen sizes vary from small phones to large tablets. We design using a responsive approach — defining the design at primary iPhone and Android sizes and specifying how layouts adapt for other sizes. For apps that must work on tablets as well as phones, we design tablet-specific layouts that take advantage of the additional screen real estate rather than simply scaling up the phone layout. We test designs across multiple device sizes during the design phase using device frames in Figma.

An interactive prototype is a clickable simulation of the app — built in the design tool — that allows users and stakeholders to navigate between screens and experience key interactions without writing any code. Prototypes are valuable for: user testing (presenting real interaction scenarios to test users); stakeholder review (enabling non-technical stakeholders to experience the design); developer reference (showing how interactions and transitions should work); and investor demonstrations. We recommend interactive prototyping for all mobile app design projects — catching usability issues before development is far cheaper than discovering them after.

We conduct moderated usability testing with 5–8 representative users — presenting prototype tasks ("find and add a product to your cart", "change your account settings") and observing whether users can complete them without assistance. We record screen and audio, note points of hesitation or confusion, and analyse patterns across sessions. Unmoderated testing (users complete tasks independently with screen recording) is an efficient alternative for gathering broader input. We conduct at least one round of testing before final design sign-off and after significant design iterations.

A complete developer handoff package includes: all screen designs in the agreed tools (Figma files with organised layers and components); a design system/component library documenting all reusable UI components with their states (default, hover, active, disabled, error); interaction specifications documenting transitions, animations, and gesture behaviours; spacing and sizing specifications (pixel measurements, safe areas, scroll behaviour); colour and typography tokens; and exported assets (icons, illustrations, images) in the formats required for iOS, Android, and web. Complete handoff documentation is essential for accurate implementation — we treat it as a primary deliverable, not an afterthought.