Mobile UX strategy
We define the app goal, user roles, first session, recurring jobs, platform expectations and what the first release must prove.
Service · Mobile App Design
Mobile app design for iOS, Android and cross-platform products.
99 Francs® designs mobile app UX/UI for startups, SaaS products, AI apps, marketplaces and MVPs that need clear flows, premium screens and a prototype that can move into development.
Mobile app design from $4,500 (MVP, 8–12 screens).
Web product
Secondself
Mobile app
Digsdy
Search tool
Open Company Search
150+
shipped projects
$32M+
raised by clients
9,000+
tasks delivered
Direct answer
99 Francs provides mobile app design services for teams that need a clear, polished and build-ready app experience.
The service covers app UX strategy, user flows, wireframes, interactive prototypes, iOS and Android UI screens, mobile design systems, App Store visual direction and handoff for React Native, Flutter or Swift development.
What you get
Mobile design that makes the app usable before it becomes code.
The goal is not only a good-looking screen set. It is a mobile experience with a clear first session, reliable states and enough product logic for development to move confidently.
User flows and prototypes
We map onboarding, sign-in, permissions, navigation, core tasks, empty states, errors and high-risk moments before visual UI expands.
iOS and Android UI design
You get polished mobile screens for iPhone, Android and cross-platform apps, including states, components and responsive behavior.
Design handoff and app visuals
We prepare components, interaction notes, design system rules, export-ready assets and App Store visual direction when needed.
Best fit
Use mobile app design when the product needs better flow, trust and platform clarity.
The app idea is not clear enough yet
We turn a rough feature list into a mobile app flow with hierarchy, navigation, screens and a prototype that users, investors or engineers can understand.
The product needs to feel native
We design around iOS and Android expectations: gestures, tab bars, forms, permissions, states, density and platform-specific behavior.
The app is a SaaS or AI product
We design mobile dashboards, AI workflows, chat-like interfaces, task flows and product states that stay clear on small screens.
The development team needs clean handoff
We package mobile components, states, spacing rules, responsive behavior and interaction notes so React Native, Flutter or Swift implementation is not guesswork.
Process
From mobile idea to prototype-ready app design.
We keep the design work close to the product outcome: what users need to understand, which screen comes next and what developers need to build.
Audit the app idea
We review the concept, target users, platform constraints, product requirements, monetization or activation goal and existing materials.
Map the critical flows
We define onboarding, navigation, core actions, account states, permissions, notifications and the flows most likely to affect adoption.
Design the mobile interface
We create high-fidelity screens, states, components, prototype behavior and platform-ready UI for iOS, Android or cross-platform apps.
Prepare for build
The final handoff includes app structure, screen specs, component logic, asset guidance and notes for mobile app development.
Related work
Product and mobile interface work for apps, SaaS, AI products and MVPs.
The same product-design discipline applies to mobile apps: reduce cognitive load, make the next action obvious and keep the UI credible.
Mobile App · iOS, Android, Mac, Watch
Timeslide our own world clock
Our own world clock where every city is a card: drag one sideways and a single shared time moves across all of them, with the weather for that hour. Built natively for iPhone, Android, Mac and Apple Watch, with widgets, GPU weather shaders and 8 languages. On the App Store and Google Play.
iOS App · Widgets
My Chess Rating our own iOS app
Our own iPhone app and home-screen widget that puts Chess.com and Lichess ratings in one place and explains why they move: tilt check, best hours, openings that cost points, goals and a Sunday report. SwiftUI, WidgetKit and StoreKit 2 on a Node and Postgres backend, designed, shipped and run by 99 Francs.
Mobile app design
Litrol fuel app
Mobile app UX/UI redesign for a fuel and energy app: balance, savings, payments, navigation, transactions, referral entry points and launch landing page.
Mobile app design sprint
If the mobile app needs to earn trust before it is fully built, design the experience first.
UX strategy · iOS UI · Android UI · Prototype · App handoff
Start app design→Mobile app design FAQ
Questions teams ask before designing a mobile app.
Mobile app design services include UX strategy, user flows, wireframes, interactive prototypes, iOS and Android UI screens, app navigation, states, components, design system rules and developer-ready handoff.
Yes. 99 Francs designs iOS, Android and cross-platform mobile app experiences, including platform-aware navigation, forms, gestures, permissions, empty states and visual UI.
Yes. If the scope is focused, the design work can continue into mobile app development using React Native, Flutter or Swift.
Mobile app design starts at $4,500 for an MVP with 8–12 screens. The price moves with screen count, flow complexity, platforms covered and how many states and prototypes are in scope. Design runs in fixed-price phases with no upfront payment — see how we work.
Yes. A polished mobile prototype can make the product easier to explain to investors, partners and early users before the team commits to full development.
You do. Every screen, flow and design file from a paid phase is yours to keep and hand to any development team — ours or otherwise.