Creating a Business Mobile App

1. Does your business really need a mobile app?

Before talking budget and technology, let's ask the uncomfortable question: is a mobile application really necessary for your business? The honest answer is often "not necessarily". And a good service provider will tell you that before charging you anything.

In 2026, over 60% of web traffic is mobile. But that doesn't mean every business needs a dedicated app. A well-designed responsive website covers most needs. A mobile application is justified when you need features that the web cannot provide, or when the user experience must be significantly superior to what a browser allows.

The most common pitfall: developing a mobile application because "everyone has one", without verifying that the use case justifies it. Result: a budget of 30,000 to 60,000 EUR spent on an app that generates 200 downloads and ends up being abandoned.

2. Native app, responsive website or PWA: when each option makes sense

The choice between these three approaches depends on your use case, your budget and the frequency of use by your customers or employees. Here's a simple framework to decide.

The responsive website: for 80% of SMBs

A responsive website automatically adapts to all screen sizes. It's the most economical and fastest solution to deploy. It's perfectly suited for showcases, blogs, product catalogs and simple web applications. No store submission, no updates to push, just one codebase to maintain.

The PWA: the best of both worlds

The Progressive Web App is a website that behaves like an application: installable on the home screen, partial offline functionality, push notifications (on Android). It's the most relevant choice for most SMBs that want a mobile presence without the budget of a native app.

PWA limitations: restricted hardware access on iOS, no presence on the Apple App Store (except through wrappers), and lower performance than native apps for complex interfaces.

The mobile application: when the experience must be flawless

The mobile app is necessary when you need a smooth user experience, complete access to phone hardware, optimal performance or presence on stores. This is the case for business applications used daily, marketplaces, delivery applications or field tools.

3. The 5 types of mobile applications

If you've determined that a mobile application is the right strategy, it remains to choose how to develop it. There are five approaches, each with its advantages, limitations and pricing.

1. Native iOS (Swift/SwiftUI)

An application developed exclusively for iPhone and iPad, using Apple's language and tools. It's the benchmark for performance and user experience in the Apple ecosystem. The app exploits 100% of the system's capabilities: smooth animations, complete access to Apple APIs (HealthKit, ARKit, etc.), native integration with the ecosystem (Apple Watch, AirDrop, Siri).

Major drawback: the code only works on iOS. If you also want Android, you need a second complete development.

2. Native Android (Kotlin)

The equivalent for Google's ecosystem. Kotlin has been the official language for Android since 2019. Native Android applications have access to all platform APIs and offer the best performance on Android devices, which account for approximately 75% of the global market (and about 30% in France).

3. Cross-platform: React Native

React Native, developed by Meta, allows you to create an iOS and Android application from a single JavaScript/TypeScript codebase. The framework compiles into native components, which offers performance close to native for the vast majority of use cases.

It's the most popular approach in 2026 for SMBs and mid-market companies: it cuts development costs by almost half compared to double native, while maintaining high-quality user experience. Instagram, Discord, Shopify and Bloomberg use React Native.

4. Cross-platform: Flutter

Flutter, developed by Google, uses the Dart language and a custom rendering engine (Skia then Impeller). The approach is different from React Native: instead of compiling into native components, Flutter draws each pixel on the screen, allowing complete control over the interface and extremely smooth animations.

Flutter excels for applications with a strong visual component: fintech, media, design-focused e-commerce. It also offers the best multi-platform support (iOS, Android, web, desktop) from a single codebase. Google Pay, BMW and eBay Motors use it in production.

5. Hybrid (Ionic, Capacitor)

The hybrid approach wraps a web application (HTML/CSS/JavaScript) in a native container. It's the least expensive solution for getting presence on stores, but performance and user experience are significantly inferior to other approaches.

4. Cost by approach: the real prices in France in 2026

The prices below correspond to ranges observed on the French market in 2025-2026, for an application of medium complexity (authentication, a few main screens, API connection, push notifications). Very simple applications can cost less, complex applications much more.

PWA: 5,000 - 15,000 EUR

The Progressive Web App is the most accessible option. In the lower range (5,000 - 8,000 EUR), you get a simple PWA with a few screens, basic offline mode and installation on the home screen. In the higher range (10,000 - 15,000 EUR), expect a more elaborate interface, data synchronization, and push notifications.

Average timeframe: 2 to 6 weeks. Key advantage: no store submission fees and instant updates.

Cross-platform (React Native / Flutter): 15,000 - 60,000 EUR

This is the sweet spot for most businesses. A single development produces a quality iOS and Android application. In the lower range (15,000 - 25,000 EUR), you get a functional application with 5 to 10 screens, authentication, and API connection. In the higher range (35,000 - 60,000 EUR), expect an advanced interface, integrated payment, geolocation, and custom backend.

Average timeframe: 2 to 4 months. Typical savings: 30 to 40% compared to double native.

Native iOS or Android: 20,000 - 80,000 EUR

Native development for a single platform. The budget is higher than cross-platform because the code is not reusable. In return, you get the best performance and complete access to all features of the target platform.

Average timeframe: 2 to 5 months. Choose if: your audience is 90%+ on a single platform, or your technical needs are specific to iOS or Android.

Double native (iOS + Android): 40,000 - 150,000 EUR

Two teams, two codebases, two maintenance cycles. This is the most expensive option, but also the one that offers the best experience on each platform. Justified for mass-market applications with high volume (millions of users) or very demanding technical applications.

Average timeframe: 3 to 6 months (parallel development). Note: annual maintenance will also be doubled.

5. The development process: from idea to App Store

Creating a mobile application is a project structured in 8 distinct phases. Understanding these steps allows you to better evaluate quotes, ask the right questions to providers and anticipate real deadlines.

Phase 1: Scoping and specifications (1-2 weeks)

This is the most critical phase. We define the functional scope, user personas, key journeys and technical constraints. Good scoping prevents 80% of budget overruns. The deliverable is a functional requirements document that will serve as a reference throughout the project.

Phase 2: UX Design (1-3 weeks)

The UX designer creates wireframes (low-fidelity mockups) that define information architecture and user journeys. This step is often underestimated, but it determines the usability of the final application. Budget 2,000 to 8,000 EUR for this phase.

Phase 3: UI Design (1-3 weeks)

The UI designer transforms wireframes into high-fidelity mockups: colors, typography, icons, animations. This is the visual identity of your application. Mockups are usually created in Figma and submitted for validation before development.

Phase 4: Technical architecture (1 week)

Developers define the project architecture: framework choice, code structure, API, database, hosting. This phase includes setting up the development environment and CI/CD tools (continuous integration and deployment).

Phase 5: Front-end and back-end development (4-12 weeks)

The longest phase. Developers code the application according to validated specifications and mockups. Work is done in 2-week sprints with regular demos to validate progress. Front-end (user interface) and back-end (server, database, API) are developed in parallel.

Phase 6: Testing and QA (1-3 weeks)

Functional testing, performance testing, compatibility testing (different devices and OS versions), security testing. A rigorous QA phase is essential: bugs not detected at this stage will cost 5 to 10 times more to fix after launch.

Phase 7: Store submission (1-2 weeks)

Submission to the App Store (Apple) and Google Play Store requires preparing product listings (screenshots, description, keywords), complying with each platform's guidelines, and passing review. Apple is notoriously more demanding than Google: expect 1 to 7 days for Apple review, versus 1 to 3 days for Google.

Phase 8: Launch and post-launch follow-up (ongoing)

Launch is just the beginning. The first weeks are crucial for fixing bugs reported by real users, analyzing usage metrics and iterating quickly. Budget for post-launch support of at least 1 month in your contract.

6. Common features and their impact on the budget

The cost of your mobile application depends directly on the features you integrate. Here are the most requested modules and their impact on the total budget.

Authentication and account management: +2,000 - 5,000 EUR

Sign-up, login, forgot password, user profile. If you add social login (Google, Apple, Facebook), budget an additional 1,000 to 2,000 EUR. Biometric authentication (Face ID, fingerprint) is generally included in native SDKs and adds little additional cost.

Push notifications: +1,500 - 4,000 EUR

Push notifications are a powerful engagement lever, but their implementation is more complex than it seems. You need to manage permissions, tokens, audience segmentation and open rate tracking. The higher range includes a system of scheduled and personalized notifications.

Integrated payment: +3,000 - 8,000 EUR

Integrating a payment system (Stripe, Mollie, or Apple/Google In-App Purchases) requires special attention to security. Note: Apple and Google take a commission of 15 to 30% on in-app purchases, which can significantly impact your business model.

Geolocation: +2,000 - 6,000 EUR

Interactive maps, point of interest search, routing, geofencing. Cost depends mainly on map complexity and provider choice (Google Maps, Mapbox, OpenStreetMap). Be careful with Google Maps API costs that can quickly add up at high volume.

Offline mode: +3,000 - 10,000 EUR

Offline functionality is one of the most complex features to implement correctly. You need to manage local storage, data synchronization, conflict resolution and edge case handling (intermittent connection). It's an investment justified for field applications or areas with poor network coverage.

Camera and image processing: +2,000 - 8,000 EUR

Photo capture, document scanning, barcode/QR code recognition, filters. The range varies greatly depending on complexity: a simple QR code scan costs 2,000 EUR, while a document recognition system with OCR can reach 8,000 EUR or more.

7. App Store Optimization: making your app visible

Publishing an application to stores is not enough: it needs to be found. App Store Optimization (ASO) is the SEO of app stores. It's a free and often neglected lever that can make the difference between 100 and 10,000 organic downloads per month.

Essential ranking factors

An initial ASO budget of 1,000 to 3,000 EUR for initial optimization (texts, visuals, keyword strategy) is a highly profitable investment. It's often the most overlooked item for SMBs launching an app, yet it has the best cost/impact ratio.

8. Maintenance costs: what to budget for each year

This is the budget line that SMBs underestimate the most. A mobile application is never "finished": operating systems evolve (iOS and Android release a major update each year), third-party APIs change, users discover bugs, and market expectations progress.

Basic rule: budget 15 to 20% of initial development cost per year for maintenance. This budget covers:

9. Complete comparison: PWA vs Cross-platform vs Native

This table summarizes the differences between the three major families of approaches. It allows you to quickly cross-reference the criteria that matter most for your project.

10. 5 questions to determine the best approach

Rather than choosing a technology upfront, answer these five questions. Your answers will naturally guide you toward the right approach.

11. JAIKIN: cross-platform expertise, native quality

At JAIKIN, we made the strategic choice of cross-platform with React Native and Flutter. This choice is based on a conviction: for 90% of mobile projects in SMBs and mid-market companies, cross-platform offers the best quality/cost/time ratio without perceptible compromise in user experience.

Why React Native and Flutter?

These two frameworks are the undisputed leaders in cross-platform in 2026. React Native is ideal for teams already working in JavaScript/TypeScript and projects that require deep integration with native modules. Flutter excels for visually rich interfaces and projects targeting more than two platforms (mobile, web, desktop).

Our team masters both technologies and recommends the most suitable for your context. We never force a tool: technology choice always serves the project, not the other way around.

Our approach: from audit to deployment

12. Frequently asked questions

Sources and references