Mobile App Development Services for iOS, Android and Cross-Platform

If your app needs deep platform features, sustained 60 fps animations or hardware integrations, we go native with Swift and Kotlin. For content-heavy apps with shared business logic, React Native or Flutter halve the cost without hurting UX.

Plan for 24 to 72 hours per submission. We pre-flight every release against current store guidelines, including DSA, EU Digital Markets Act and tracking transparency rules, so first-time rejections are rare.

Yes. We routinely take over legacy iOS or Android apps, stabilize them, and run a parallel rewrite. Users keep getting fixes while the new build matures behind a feature flag and a phased rollout.

We use native consent dialogs, IDFA and AAID handling per platform rules, region-locked analytics (EU-only for EU traffic, US-region for US traffic), and no SDKs that phone home before consent. DPAs are signed for every third-party SDK in the bundle. CCPA / CPRA opt-out flows for US users.

Mobile apps are fixed-scope and tiered by product maturity, all-in and quoted in USD. An MVP runs from $3,500 (4–8 weeks: one core flow on iOS and Android with store release); a production app from $5,800 (several features, mobile backend, offline persistence, analytics); a full product from $9,200 (multiple modules, roles, external integrations, CI/CD, real-device QA); and a complex app from $11,500 (offline-first sync, native modules, in-app payments, scale, A/B). The exact number depends on the number of features and surfaces, integration count, offline-first complexity and compliance scope. You see the line-item budget after a free scope assessment and sign off before any code is written — no recruitment markup, no tool surcharges, and App Store, Play and cloud fees run on your own accounts.

Yes. On-device AI (Apple Intelligence, Gemini Nano, Core ML, LiteRT) lets us add private, offline, instant features with no per-request cost, escalating to the cloud only when a request genuinely needs it. See our 2026 guide to on-device AI in mobile apps.

Budget 15 to 25% of the initial build cost per year, with the first year usually higher as the app stabilises. Full breakdown in our guide to mobile app maintenance cost in 2026.

Cross-platform (React Native, Flutter, Kotlin Multiplatform) typically saves 30 to 45% of combined build cost with one codebase; native (Swift, Kotlin) wins for performance-critical and deeply integrated apps. We help you decide in native vs cross-platform app development.

For FinTech and HealthTech we default to native Swift and Kotlin. These platforms give direct access to hardware-backed Keystore and Secure Enclave for cryptographic key custody, BiometricPrompt and Local Authentication for biometric flows, and platform attestation APIs (Play Integrity, DeviceCheck) that regulators and card networks expect to see in a security assessment. Cross-platform frameworks can work in regulated contexts, but they add an abstraction layer between your app and the hardware security module, which has to be justified to your compliance team and sometimes to the regulator. For lower-sensitivity EdTech or LegalTech products, Flutter and React Native are viable and save meaningful budget.

On iOS, we design around the actual Background App Refresh budget: APNs silent pushes wake the app for short data-fetch windows, Background Tasks (BGTaskScheduler) handle deferred processing, and VoIP pushes are used only for genuine real-time call flows to avoid App Store policy violations. On Android, we use WorkManager for deferrable jobs that survive Doze mode and App Standby, and foreground services with a visible notification only for tasks — GPS streaming, audio, media downloads — that genuinely require continuous execution. We test on real devices under Doze, App Standby Bucket constraints, and per-OEM battery optimizer profiles (Samsung, Xiaomi, OnePlus, Huawei) because these vary significantly from stock Android behavior and are the leading cause of background task failures in production.

Yes, this is our most common starting point. We design the mobile layer to consume your existing API, building a mobile-optimized BFF (Backend for Frontend) where needed to aggregate over-fetched REST endpoints or replace them with a GraphQL layer shaped for mobile payloads. If your backend does not yet have the right endpoints for offline sync, push, or deep-link routing, the same team extends the backend — we do not hand you a mobile client that requires a separate backend group to unblock it. We also wire authentication, token refresh, and certificate pinning on top of your existing identity provider without re-architecting your backend.

Store compliance for regulated apps requires more than a clean binary. On the App Store, HealthTech apps that collect or transmit health data trigger the Health & Fitness entitlement review and must have a clear Privacy Nutrition Label for Health & Fitness data types. FinTech apps with card-on-file or lending flows must comply with Apple's financial services guidelines, including clear disclosure of rates and terms. On Google Play, the Data Safety form must accurately reflect every SDK that touches health or financial data, restricted permissions (MANAGE_EXTERNAL_STORAGE, READ_CALL_LOG, AccessibilityService) must be justified with a Permissions Declaration Form, and apps in the Financial Services category face enhanced review. We pre-flight every submission, write the review notes, and handle rejection responses — first-time approval is our standard, not our goal.

Post-launch support covers crash and ANR triage against a 99.5% crash-free session SLO, annual targetSdk upgrades to stay within Google Play's one-year policy window, iOS SDK and Swift concurrency updates, store review monitoring, and a backlog for platform changes from Apple and Google. Most clients run a maintenance retainer at 15 to 25% of build cost per year, with the first year typically higher as the app stabilizes post-launch. Phased rollouts on Play Console (1% → 5% → 20% → 100%) and TestFlight staged releases allow us to detect regressions with a small user cohort before they reach the full audience. If a release introduces a critical regression, we can issue a hotfix and revert the staged rollout within hours.

Third-party SDKs are audited at discovery: we check the SDK's last update, open CVE count, App Store Privacy Manifest (mandatory since May 2024) and Play Data Safety mapping, and whether the vendor provides a signed DPA for GDPR purposes. Payment SDKs (Stripe, Adyen, ЮKassa for RU-market) are integrated in a PCI-scoped data flow so cardholder data never touches the app server. Maps use MapKit (iOS), Google Maps SDK (Android), or Here Maps for logistics projects requiring real-time traffic data. Analytics use Mixpanel, Amplitude, or Firebase Analytics with user ID hashing and IP anonymisation configured on day one.

Post-launch support runs in three tiers: crash-and-regression cover (Sentry / Firebase Crashlytics monitoring, fix within SLA, OTA update for JS-bundle apps), maintenance sprints (quarterly SDK upgrades, targetSdk bump, App Store / Play policy change response), and growth iteration (new feature development in 2-week sprints, A/B testing via Firebase Remote Config). We handle Apple Developer Program and Google Play Console renewals, store metadata updates, and App Store Connect / Play Console submissions as part of the engagement. SLAs are written into the contract and include an escalation path to the original development team — not a separate support tier with no context.

Both. For greenfield products we build the full stack: mobile client, REST or GraphQL API (Node.js, Python Django/FastAPI, or Go), infrastructure on AWS / GCP / Azure, and CI/CD pipeline with Fastlane. The same team owns client and backend, which eliminates the API contract negotiation overhead that plagues split teams and means we can fix a data problem at the source rather than working around it on the mobile side. For existing backends we integrate the mobile layer via the existing API, write any missing endpoints the product needs, and document the interface for future maintenance.

Timeline follows the same logic as cost: most mobile apps take 3 to 6 months from discovery to first public launch. A simple MVP (one core flow, one platform) typically takes 2 to 3 months. A production app with multiple features, backend integrations, and a dual-platform release takes 4 to 6 months. A complex regulated product (payments, HIPAA, multi-role) takes 6 to 12 months or more. Discovery adds 2 to 4 weeks at the start but compresses the build phase by avoiding mid-sprint scope ambiguity. We release to TestFlight and internal Play tracks at the end of every sprint so you see working software every two weeks, not at the end of the project.

Yes. We start with a code audit: architecture review, dependency scan for outdated packages and known CVEs, Play / App Store policy compliance check, and performance profiling to identify regressions. The audit deliverable is a prioritised remediation list with effort estimates so you can decide what to fix before handing over the roadmap. Common legacy handovers we have completed: Java-to-Kotlin migrations, UIKit-to-SwiftUI rewrites, RxJava-to-Coroutines modernisations, and cross-platform consolidations where a separate iOS and Android codebase was unified in Flutter or React Native. We do not require a rewrite unless the audit finds fundamental architectural debt that makes incremental improvement uneconomical.