# Mobile Apps > iOS and Android mobile apps, native or cross-platform. Polished UX, optimal performance and full support through store publishing. Page: https://eldev.fr/en/services/mobile-apps/ · Version française: https://eldev.fr/services/applications-mobiles/index.md · [Home](https://eldev.fr/en/index.md) We develop mobile applications for iOS and Android that deliver smooth user experiences and optimal performance. Native with Swift or Kotlin, or cross-platform with [React Native](https://eldev.fr/en/technologies/react-native/index.md) and Flutter, we choose the approach best suited to your project and budget. From idea to App Store and Google Play publishing, we support you at every stage: [UX design](https://eldev.fr/en/services/ui-ux-design/index.md), development, testing, deployment and [post-launch updates](https://eldev.fr/en/services/maintenance/index.md). ## Capabilities ### Cross-platform Single codebase for iOS and Android with React Native or Flutter. Reduce development costs while delivering a native experience on both platforms, with faster time-to-market. ### Native apps Maximum performance with Swift (iOS) and Kotlin (Android) for demanding applications. Full access to phone features: camera, GPS, sensors and secure local storage. ### Push notifications User engagement through targeted and personalized notifications. Segment your audience, automate sends and boost retention with relevant messages at the right time. ### Store publishing Full support for App Store and Google Play listing. Store listing optimization, screenshots, guideline compliance and monitoring during the first weeks after launch. ## Who is this service for? You need a mobile app that ships and holds up, not a prototype that stalls halfway. From [healthcare](https://eldev.fr/en/sectors/healthcare/index.md) to logistics, the constraints are the same: stability, store approval and long-term upkeep. - [Startup](https://eldev.fr/en/sectors/startups-saas/index.md) aiming to launch an iOS + Android MVP in 6 to 8 weeks to validate the market - Business extending an [existing web service](https://eldev.fr/en/services/web-development/index.md) to a proper native mobile experience - Internal tool for field teams, logistics staff or back-office, not a public-facing app - Aging app that needs a full rewrite on a modern stack (React Native, Flutter or native) ## How it works. We start with UX design for your app: user journeys, wireframes and mockups. Development follows an agile cycle with regular test builds. We then handle store publishing and post-launch support. ## What makes the difference. Smooth, high-performing apps tested on real devices. We don't stop at publishing: we support you with updates and the ongoing evolution of your app. ## Frequently asked questions. ### React Native / Flutter vs native: which should I choose? React Native and [Flutter](https://eldev.fr/en/technologies/flutter/index.md) target iOS and Android from a single codebase, the right call for an MVP or a tight budget, with results indistinguishable from native for most use cases. Native (Swift / Kotlin) makes sense for highly graphical apps, complex animations or heavy hardware access. We recommend the right approach at kickoff based on your timeline and budget. ### How much does a mobile app cost? Mobile app cost varies a lot depending on the platform (cross-platform or native), number of screens, API integrations and back-office requirements. Every project is quoted after a free scoping session, [reach out](https://eldev.fr/en/contact/index.md) for an estimate within 12 hours. ### How long until we go live on the App Store and Google Play? A well-scoped MVP is submitted to both stores in 6 to 10 weeks. Apple review averages 1 to 3 days (sometimes up to 2 weeks if rejected), Google Play approves in 24 to 72 hours. We prepare store listings, screenshots and descriptions that meet guidelines to maximize first-submission approval. ### Do you handle App Store and Google Play submission? We manage the full process: developer account setup or configuration for Apple ($99/year) and Google ($25 one-time), build submission, review response and post-publish monitoring. For the visual side of store listings, we pair with [UI/UX design](https://eldev.fr/en/services/ui-ux-design/index.md) to deliver screenshots and an icon that convert. ### Can you take over and modernize an existing app? Yes. We audit the existing code, architecture, dependencies, performance, and propose a partial or full rewrite plan. Whether your app is on aging React Native, Cordova or unmaintained native code, we identify what to keep and what to rebuild. Ongoing [post-launch maintenance](https://eldev.fr/en/services/maintenance/index.md) is then available to keep your app current with new iOS and Android releases. ## Technologies & industries - [Freelance Flutter Developer](https://eldev.fr/en/technologies/flutter/index.md): Freelance Flutter developer: one codebase for iOS and Android, fluid interface, notifications, offline mode, store publication. Free quote within 12 hours. - [Freelance React Native Developer](https://eldev.fr/en/technologies/react-native/index.md): Freelance React Native developer: iOS and Android apps with Expo, code shared with your React web app, store publication and follow-up. Free quote within 12 hours. ## Other services - [Web Development](https://eldev.fr/en/services/web-development/index.md): Custom sites & apps - [E-commerce](https://eldev.fr/en/services/e-commerce/index.md): Stores that convert - [Artificial Intelligence](https://eldev.fr/en/services/artificial-intelligence/index.md): Automation & chatbots - [UI/UX Design](https://eldev.fr/en/services/ui-ux-design/index.md): Memorable interfaces - [WordPress & CMS](https://eldev.fr/en/services/wordpress-cms/index.md): Content management - [Desktop Apps](https://eldev.fr/en/services/desktop-apps/index.md): Cross-platform desktop - [Hosting & Infra](https://eldev.fr/en/services/hosting-infra/index.md): Servers & deployment - [Maintenance](https://eldev.fr/en/services/maintenance/index.md): Ongoing support - [ERP & Consulting](https://eldev.fr/en/services/erp-consulting/index.md): Integrated management & audit - [Website Repair](https://eldev.fr/en/services/website-repair/index.md): Emergency, picked up within 2 hours ## Contact [Contact form](https://eldev.fr/en/contact/index.md) (HTML page: https://eldev.fr/en/contact/) · Email: contact@eldev.fr · First chat is free. Response within 12 hours on business days.