TL;DR — Belov Digital develops native iOS apps (Swift, SwiftUI), native Android apps (Kotlin, Jetpack Compose), and React Native cross-platform apps (Expo) for US companies. We handle App Store and Google Play submission, in-app purchases (Apple/Google billing + Stripe/RevenueCat), push notifications, and ongoing maintenance. Mobile apps ship in 12–24 weeks from $40,000. Talk to a senior mobile engineer on the first call.
Mobile app development services we offer
- Native iOS app development — Swift, SwiftUI (or UIKit for legacy support), Combine, Core Data / SwiftData, HealthKit, ARKit, Apple Pay, In-App Purchase, App Tracking Transparency.
- Native Android app development — Kotlin, Jetpack Compose (or XML layouts for legacy), Coroutines + Flow, Room, Hilt for DI, Google Pay, Play Billing.
- React Native cross-platform development — React Native with Expo for fastest iteration, or bare React Native for deeper native integration. Best when iOS + Android need the same core feature set with shared logic.
- Mobile app modernization — rewriting legacy Objective-C / Java apps to modern Swift / Kotlin, or migrating Cordova / Ionic apps to React Native or native.
- Backend for mobile — we build the API + backend that powers your app: Node.js / Next.js API routes, Firebase, AWS Amplify, Supabase, or custom GraphQL.
- App Store and Play Store submission — we handle the whole submission process: App Store Connect setup, screenshots, metadata, App Privacy questionnaire, review responses, Play Console setup.
- Push notifications and deep linking — APNs, FCM, OneSignal, Branch.io / Adjust for deep linking and attribution.
- Ongoing app maintenance — SDK upgrades, iOS/Android version compatibility, bug fixes, feature additions, App Store re-submissions.
Native vs React Native vs PWA — which to pick
| Approach | Best for | Cost | Timeline |
|---|---|---|---|
| Native iOS + Native Android (two codebases) | Performance-critical apps, deep OS integration, AR/ML/Camera-heavy, healthcare, finance | $80K–$300K | 16–30 weeks |
| React Native + Expo (one codebase, two stores) | Most consumer + B2B apps where 90%+ feature parity needed | $40K–$150K | 12–20 weeks |
| Native iOS only (Swift) | Premium consumer apps with iOS-first audience | $50K–$200K | 14–24 weeks |
| Progressive Web App (PWA) | Apps that don’t need App Store presence, simpler distribution | $25K–$80K | 8–14 weeks |
| Flutter (cross-platform, Dart) | When client specifically prefers Flutter ecosystem | $45K–$160K | 14–22 weeks |
Our mobile tech stack
- iOS: Swift 6, SwiftUI, Combine, SwiftData / Core Data, async/await concurrency, XCTest. UIKit when legacy support is required.
- Android: Kotlin 2.x, Jetpack Compose, Coroutines, Flow, Hilt (DI), Room, Retrofit + OkHttp, JUnit/Espresso.
- React Native: React Native 0.74+, Expo SDK 50+, TypeScript, React Query / Zustand, React Navigation, Reanimated, Skia for high-perf graphics.
- Backend: Node.js (Next.js API routes, Hono, Fastify), Postgres, Prisma, Redis. Firebase for rapid MVPs, AWS Amplify for enterprise.
- Auth: Sign in with Apple, Google Sign-In, Auth0, Firebase Auth, custom OAuth.
- Payments: Apple In-App Purchase + Google Play Billing for digital goods, Stripe for physical goods, RevenueCat for subscription management across both stores.
- Notifications: APNs + FCM via OneSignal or custom server, Branch.io for deep linking.
- Analytics & crash reporting: Firebase Analytics, Mixpanel, PostHog, Sentry for crashes, Datadog Mobile.
- CI/CD: GitHub Actions or Bitrise for build pipelines, Fastlane for App Store / Play Store deploys, TestFlight + internal Play tracks for QA.
When to pick Belov Digital for mobile
- You need an app that ships and gets approved — App Store / Play Store rejection is common with amateur teams. We handle review-cycle issues from day one.
- You want the right architecture for the right use case — native vs React Native vs PWA decisions made by engineers, not by what we happen to know.
- You need backend + mobile under one roof — we build the API that powers your app, not just the app itself.
- You need US-time-zone communication — not a 12-hour async loop with offshore teams.
- You need ongoing iteration post-launch — new iOS/Android versions break apps every September; we maintain compatibility.
Typical mobile app project costs in 2026
| App type | Typical cost | Timeline |
|---|---|---|
| Simple utility / brand app (React Native) | $40,000–$80,000 | 10–16 weeks |
| Mid-complexity consumer app (RN or native) | $70,000–$180,000 | 14–22 weeks |
| Premium native iOS + Android (two codebases) | $120,000–$350,000 | 20–32 weeks |
| B2B / enterprise mobile app (native, SSO, complex) | $150,000–$500,000 | 24–40 weeks |
| Companion app for existing web platform | $50,000–$150,000 | 12–20 weeks |
| Ongoing mobile maintenance retainer | $3,000–$15,000/month | continuous |
Frequently asked questions
Should I build native or React Native?
React Native if iOS + Android need the same core feature set (most consumer + B2B apps). Native if you need deep OS integration (HealthKit, ARKit, custom camera, advanced background processing) or if performance is a hard requirement (3D games, real-time video). We’ll recommend honestly based on your use case.
How long does App Store review take?
Apple: usually 24–48 hours for standard submissions in 2026, longer for first submissions or apps in regulated categories. Google Play: usually a few hours to 3 days.
Will I own the codebase?
Yes, fully. Code lives in your GitHub from day one. Apple Developer + Google Play accounts are in your name, not ours.
Do you build the backend too?
Yes — the API + backend that powers your app. Node.js (Next.js / Hono), Postgres, Redis. Or we integrate with your existing backend if you have one.
Do you handle App Store / Play Store submission?
Yes — full end-to-end. App Store Connect setup, screenshots, metadata, App Privacy questionnaire, review responses, beta testing via TestFlight, public release.
What about Flutter?
We build in Flutter when the client specifically prefers it. We default to React Native + Expo because the JavaScript ecosystem is larger and easier to hire for; Flutter is technically excellent but a smaller talent pool.
Building a mobile app? Get a scoped proposal from Belov Digital within 48 hours →