Interface and experience are the only parts of your product a user ever touches, which makes app design a conversion engine rather than a cost line. At PBDP we start from behavior: who the user is, where they use the app with one thumb, and which three jobs must work without a tutorial. The output is a complete set of bespoke Figma screens, a clickable prototype and a component library that engineers use directly to build cross-platform apps. The payoff shows up in numbers—lower abandonment, completed checkouts and better store ratings—long before anyone calls it beautiful.

What differs between UI and UX on mobile

UX begins with the problem: information architecture, task hierarchy, core flows and the removal of pointless steps. UI gives those answers a form—grid, typography, color, spacing, iconography and interaction states. Mobile adds physical constraints a desktop designer never meets: a five-inch canvas, thumbs instead of cursors, flaky connections and bright sunlight. We run both layers in parallel so that aesthetics always serve one job, which is getting the user to done with the fewest taps.

Why good design pays for itself

A first session decides whether an app survives; you have roughly three seconds. A long sign-up, a hidden primary button or unreadable small type is where users leave. Solid design also shrinks support load, because “how do I do this?” tickets never appear. The second effect is on engineering: a change made in a design file costs a fraction of the same change made in released code. That is why we spend risk early, on prototypes, instead of late, on hotfixes and emergency sprints.

Platform standards, RTL and accessibility

Android users expect Material and iPhone users expect Human Interface; familiarity is a feature we do not trade away for novelty. We blend those conventions with your brand, and for Persian products we build right-to-left layouts at the level of type, icon direction and motion rather than mirroring a left-to-right file. Contrast ratios, minimum touch targets, dark mode and legibility outdoors sit in our checklist—particularly in iOS app development, where dynamic type and color profiles magnify every small mistake.

Deliverables you receive

• Editable Figma source: every screen, reusable components, styles and a dev-ready view your engineers can inspect.
• Mobile design system: color tokens, Latin and Persian type scales, spacing rules, icons and button states captured as a documented design system.
• Wireframes and clickable prototype: key journeys playable on a real handset for stakeholder and investor review.
• Edge-state design: empty, loading, error, offline and success screens—the ones products usually forget.
• Store assets: screenshots, feature graphics and icons prepared for app store publishing and ASO.
• Developer handoff: interaction specs, motion values and annotated measurements so nothing is guessed in code.

How a design project runs

1. Input and research: analytics, competitor teardowns and a handful of real user interviews to locate the actual friction.
2. Structure: screens, priorities and journey map agreed so scope locks before visual work begins.
3. Visual exploration: two or three art directions, one chosen and expanded across the whole product.
4. Validation: findings from usability testing reshape the design before it becomes engineering debt.
5. Handoff and follow-through: implementation review during launch and through later app updates and redesigns.

Frequently asked questions

How long does app design take?

A focused product with ten to twenty core screens typically runs three to six weeks. The schedule depends less on page count than on decision speed, so reviews sit on fixed calendar days with a written agenda—this is what stops projects stalling in stakeholder loops.

Will the design survive technical implementation?

Yes, because platform conventions and the limits of a complex feature set are considered from day one. Every component ships with named states and measured values, and the final pass is a pixel review with the developers, not a polite assumption.

We already have an app that looks dated. Where do we start?

With an experience audit: usage data, crash reports and user feedback, mapped to the exact points where people drop out. We then recommend a phased redesign so familiar workflows survive and your store rating does not dip while the product changes underneath regular users.

Send us your current app and we will return a short, concrete list of the changes worth making first—explore the service catalogue and talk to our design team.