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A mobile app development agency is a company that designs, builds, and launches mobile applications for iOS, Android, or both platforms. Services typically include UI/UX design, front-end development, backend API integration, App Store submission, and ongoing maintenance. A full-service agency like BillionX Software also handles post-launch growth — including performance marketing and app store optimisation.

Mobile app development typically costs $15,000–$80,000+ depending on scope, platform, and complexity. A basic MVP app with core features costs $15,000–$25,000. A fully featured production app with backend integration, payment processing, and admin panel costs $35,000–$80,000+. BillionX Software provides fixed-scope quotes within 48 hours — no hourly billing, no surprise invoices.

An MVP mobile app takes 6–10 weeks from scoping to App Store submission with an experienced development agency. A full-featured production app typically takes 3–6 months. BillionX uses an AI-augmented development workflow that cuts average build time by 30–40% versus traditional agency timelines.

For most startups and scaling businesses, React Native cross-platform mobile app development is the right choice — one codebase deploys to both iOS and Android, reducing cost by 40–60% versus building two separate native apps. React Native delivers 90%+ of native performance for the vast majority of app types. Native iOS (Swift) or Android (Kotlin) development is only recommended when your app requires deep platform-specific hardware access — advanced AR, custom camera pipelines, or ultra-high-performance gaming.

Yes. BillionX Software builds iOS apps, Android apps, and cross-platform apps using React Native. We handle App Store (Apple) and Google Play submission, rejection resolution, and ongoing updates. Most clients choose React Native so both platforms ship simultaneously from one codebase.

Yes. MVP development for funded startups is one of BillionX's core specialisations. We define a scope-locked MVP in the first week — only the features that test your core hypothesis — and ship a testable build within 6–10 weeks. Fixed price. Fixed timeline. Investors and early users can interact with a real product, not a prototype.

BillionX Software is based in Mandi, Himachal Pradesh, India, and is a registered Indian company. We serve clients in the USA, UK, Europe, and Australia — all project communication happens in your timezone, and all deliverables meet Western market standards. We are Upwork Top Rated with a 10-year verified history of working with US and UK clients.

After launch, BillionX provides ongoing development support, OS update management, bug fixes, and feature additions on a retainer basis. We also offer post-launch performance marketing — including App Store Optimisation (ASO), Meta Ads, and Google Ads — to drive downloads and user growth. Most app making companies stop at launch. We don't.

Yes. BillionX provides white-label mobile app development services for US and UK agencies whose clients need iOS and Android apps. We deliver under your brand — from design through to App Store submission. You own the client relationship. We own the delivery. Contact us to discuss a white-label partnership.