Mobile Apps · Paris & France

Your mobile application, designed for usage, built to last

Your current app can't keep up with your business? Outdated user experience, insufficient performance, costly maintenance across two platforms. We design and develop high-performance mobile applications that engage your users and serve your goals.

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The challenge

Why your mobile application is holding back your growth

A mobile app that disappoints means wasted acquisition spend. Users are ruthless: 25% of apps are uninstalled after a single use.

  1. 01 Rating below 4 stars on stores: direct impact on downloads
  2. 02 Declining retention rate: 80% of users leave within the first 3 days
  3. 03 Two native codebases to maintain: 2x costs, feature gaps between iOS and Android
  4. 04 Startup time > 3 seconds: 53% of users leave if the app is too slow
  5. 05 No offline mode: app unusable in the subway, on the go or in dead zones
  6. 06 Poorly targeted push notifications: disabled by 60% of users within a month
  7. 07 UX not adapted to current mobile habits (gestures, navigation, dark mode)
  8. 08 No in-app analytics: zero visibility into user journeys and drop-offs

Solution comparison

Which technology for your application?

Cross-platform or native? The choice depends on your features, performance constraints and budget. We recommend the most suitable approach.

React Native

React Native

Strengths
  • Single codebase for iOS and Android (80-90% shared code)
  • Existing React ecosystem reusable (components, logic)
  • Hot reloading and rapid development
  • Large community, mature libraries, easier hiring
Limitations
  • Slightly lower native performance on complex animations
  • Dependency on native bridges for certain OS features
  • Major updates sometimes disruptive
  • Cross-platform debugging more complex than pure native
Ideal for: B2B/B2C apps with rich UX, existing React team, time-to-market priority
Flutter

Flutter

Strengths
  • High performance thanks to Skia/Impeller rendering engine
  • Pixel-perfect UI identical on iOS and Android
  • Ultra-fast hot reload, high developer productivity
  • Multi-platform ecosystem (mobile, web, desktop)
Limitations
  • Dart less common than JavaScript/TypeScript in teams
  • Larger application size than native
  • Native integrations sometimes more complex
  • Package ecosystem less mature than React Native
Ideal for: Apps with advanced custom design, complex animations, multi-platform (mobile + web)

PWA (Progressive Web App)

Strengths
  • No installation required, accessible via browser
  • Single web codebase for all platforms
  • Instant updates without going through stores
  • Significantly reduced development and maintenance costs
Limitations
  • Limited access to native features (Bluetooth, NFC, health)
  • Lower performance than native apps for heavy processing
  • Limited push notifications on iOS
  • Reduced visibility vs App Store / Google Play presence
Ideal for: Content-oriented apps, mobile e-commerce, constrained budget, no critical native features

Native (Swift / Kotlin)

Strengths
  • Maximum performance and full access to system APIs
  • Perfect native user experience, smooth animations
  • Deep integration with the Apple/Google ecosystem
  • Best performance for AR, on-device ML, image processing
Limitations
  • Two codebases to maintain (iOS + Android), 2x cost
  • Two specialized development teams required
  • Longer time-to-market (everything is developed twice)
  • Complex feature synchronization between platforms
Ideal for: Apps with strong hardware component (camera, sensors), extreme performance requirements
No technology dogma. We recommend the solution best suited to your context, constraints and ambitions. Every choice is documented and justified.

Our methodology

How we deliver

Architects with twenty years behind them, and a delivery process instrumented by AI: scoping, code review, quality and security tooled at every phase. Each step produces concrete deliverables, and we stay through the run.

01
2 to 3 weeks

Mobile Strategy & Scoping

Define your mobile strategy based on your business objectives. Choose the right technical approach, scope the project and align all stakeholders.
Deliverables
  • User needs analysis and priority mobile use cases
  • Competitive benchmark of sector apps
  • Documented technology choice (native, cross-platform, PWA)
  • MVP scope definition (essential features)
  • Integration mapping (API, backend, third-party services)
  • Distribution strategy (App Store, Google Play, enterprise)
  • Budget estimate and macro planning
  • Success KPIs defined (adoption, retention, engagement)
02
3 to 5 weeks

Mobile UX/UI Design

Design the mobile experience following iOS and Android guidelines. Prototype, test with real users, iterate before writing a single line of code.
Deliverables
  • User flows and low-fidelity wireframes for key journeys
  • Mobile design system (components, typography, colors, spacing)
  • High-fidelity mockups for iOS and Android (native patterns respected)
  • Interactive Figma prototypes testable on device
  • User testing on prototypes (5 to 8 testers per cycle)
  • Micro-interactions and animations defined
  • Onboarding and permission screens design
  • Developer handoff with specifications and exported assets
03
3 to 6 months

Development & Integrations

Develop the application through iterative sprints with testable builds at the end of each sprint. Integrate third-party services, backend and native features.
Deliverables
  • Iterative development (2-week sprints, testable builds)
  • Backend API and third-party service integration
  • Push notifications (Firebase Cloud Messaging / APNs)
  • Offline mode and data synchronization
  • Authentication (biometric, SSO, social login)
  • In-app analytics and usage tracking
  • Automated tests (unit, integration, UI, coverage > 75%)
  • Mobile CI/CD pipeline (Fastlane, EAS Build, App Center)
04
2 to 4 weeks

Testing & Optimization

Validate quality before store submission. Performance, security, accessibility testing, and experience optimization across a wide range of devices.
Deliverables
  • Testing on a panel of real devices (20+ iOS/Android models)
  • Performance testing (startup time, memory, battery)
  • Mobile security audit (OWASP Mobile Top 10)
  • Accessibility testing (VoiceOver, TalkBack)
  • Application size optimization
  • Network resilience testing (offline, degraded connection)
  • App Store / Google Play guidelines compliance validation
  • Critical bug fixes and UX optimization
05
Ongoing

Launch, ASO & Growth

Publish on stores, optimize visibility (ASO), monitor performance and engage a continuous improvement cycle based on usage data.
Deliverables
  • Submission and publication on App Store and Google Play
  • App Store Optimization (title, description, screenshots, keywords)
  • Crash reporting and performance monitoring (Firebase Crashlytics)
  • KPI tracking (DAU/MAU, retention, engagement, conversion)
  • Store reviews and ratings management
  • Regular updates (features, fixes, OS compatibility)
  • In-app A/B testing and continuous experimentation
  • Evolution roadmap based on usage data

Business value

What you concretely gain

Expected results

One app, two platforms, one budget

Native performance, smooth experience

Push notifications that engage

  1. 01

    One app, two platforms, one budget

    With React Native or Flutter, 80 to 90% of code is shared between iOS and Android. You cut your development and maintenance costs in half.

  2. 02

    Native performance, smooth experience

    Startup time < 2 seconds, 60 fps animations, optimized memory management. Your users can't tell the difference from a native app.

  3. 03

    Push notifications that engage

    Targeted and personalized notifications that bring your users back to the app. Open rate 3x higher than email.

  4. 04

    Smart offline mode

    Your app remains functional without a connection. Data syncs automatically as soon as the network is available.

  5. 05

    Real-time analytics and usage data

    Understand how your users interact with your app. Optimize journeys and increase engagement with reliable data.

  6. 06

    Continuous updates, zero friction

    Automated mobile CI/CD, over-the-air updates (CodePush/EAS), automated store submission. Your users always have the latest version.

Frequently asked questions

Your questions, our answers

01 Should I choose React Native, Flutter, or native?
It depends on your context. React Native is ideal if your team already knows React and web technologies. Flutter offers the best cross-platform performance and pixel-perfect design. Native (Swift/Kotlin) is justified for apps with a strong hardware component or extreme performance requirements. Our scoping phase helps make the right choice for your situation.
02 How much does mobile application development cost?
A cross-platform MVP (iOS + Android) ranges from 60K to 180K EUR depending on complexity (number of screens, integrations, native features). Cross-platform (React Native/Flutter) reduces the budget by 30 to 40% compared to two separate native developments. The scoping phase refines the estimate with a precise scope.
03 How long does it take to develop and publish an app?
From 4 to 8 months for a functional MVP published on stores. This includes UX/UI design (3-5 weeks), development (3-6 months), testing (2-4 weeks) and publication. Apple review can take 24h to 1 week. We recommend factoring review time into the schedule.
04 How do you handle post-launch updates and maintenance?
We set up a mobile CI/CD pipeline (Fastlane, EAS Build) to automate builds and store submissions. Minor updates (bug fixes, content) can be pushed via over-the-air updates without going through stores. A maintenance contract includes monitoring, crash reporting, and priority fixes.
05 Can the app work offline?
Yes, it's a feature we systematically integrate for apps that require it. Critical data is stored locally and automatically synchronized when the connection returns. The sync strategy (optimistic vs pessimistic, conflict resolution) is defined during the scoping phase.
06 How do you ensure quality across different devices?
We test on a panel of 20+ real devices (no emulators for final testing) covering the most popular models used by your target users. Automated UI tests (Detox, Maestro), performance tests (startup time, memory), and accessibility tests (VoiceOver, TalkBack) are integrated into the CI pipeline.

Ready to launch your mobile application?

Thirty minutes with an architect - the person who will scope your project, and ship it. We analyze your project, your constraints and recommend the most suitable approach - no commitment.

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