Building separate iOS and Android codebases doubles your timeline and engineering budget. We build high-performance mobile apps on React Native that feel completely native, launch to both app stores simultaneously, and cut long-term maintenance costs in half.
Single Codebase for iOS & Android • 60fps Native Smoothness • Guaranteed App Store Approval
Groooh engineers complete cross-platform mobile apps for iOS and Android using React Native, the New Architecture (Fabric and TurboModules), and modern cloud backends. Deliverables include offline SQLite data sync, push notification pipelines, in-app subscriptions via RevenueCat, and end-to-end App Store and Google Play deployment, shipping in 4 to 8 weeks at 20% below traditional agency pricing.
Cross-Platform Core
Scope
Writing unified TypeScript codebases that compile directly to native iOS (UIKit) and Android (View) hierarchies, delivering 60fps gesture handling and platform-specific styling.
Best For
Startups and growth companies looking to launch on both major app stores with one agile team.
New Architecture
Scope
Building with React Native's modern C++ JSI bindings, the Fabric renderer, and TurboModules, completely eliminating legacy asynchronous bridge latency.
Best For
High-performance applications requiring synchronous native calls, complex gestures, and rapid rendering.
Codebase Migration
Scope
Migrating fragmented native iOS and Android codebases or migrating away from Flutter into a unified, high-velocity TypeScript React Native codebase with zero downtime.
Best For
Companies tired of maintaining two separate native teams or seeking unified web and mobile development.
Offline-First
Scope
Implementing local SQLite/WatermelonDB storage, optimistic UI updates, and background conflict-resolution syncing when network connectivity drops.
Best For
Field service apps, productivity tools, and healthcare applications used in low-connectivity areas.
Hardware & Monetization
Scope
Integrating native camera scanners, Bluetooth Low Energy (BLE), background GPS, biometric Face ID, and RevenueCat subscription paywalls.
Best For
Connected health, logistics, on-demand delivery, and subscription-driven consumer mobile apps.
EAS & Store Release
Scope
Setting up Expo Application Services (EAS) cloud build pipelines, instant Over-the-Air (OTA) bug fixes, privacy manifests, and managing App Store and Google Play approvals.
Best For
Shipping critical fixes directly to user devices in seconds without waiting for app store review delays.
Building separate iOS and Android codebases doubles your timeline and engineering budget. We build high-performance mobile apps on React Native that feel completely native, launch to both app stores simultaneously, and cut long-term maintenance costs in half.
We build strictly on the New Architecture with C++ JSI. UI events and native modules execute synchronously without JSON serialization bottlenecks.
A single unified codebase means bug fixes, feature iterations, and backend integrations are written once and deployed simultaneously to both Apple and Google users.
Deploy JavaScript updates, copy tweaks, and hotfixes directly to users' devices in seconds using Over-the-Air updates, bypassing store review delays.
We handle privacy manifests, permissions justifications, and test account provisioning to ensure your application passes store reviews on the first submission.
Scoping native device requirements, offline database schemas, backend API contracts, and developer account setup.
Configuring the Expo EAS pipeline, Hermes compiler, authentication, and primary tab navigation with live TestFlight builds.
Engineering primary workflows, offline sync, push notifications, native hardware integrations, and weekly interactive builds.
60fps frame rate profiling, memory leak audits, production store review submission, and live OTA deployment.
Traditional consultancies charge $80,000 to $150,000 across 6 to 9 months for separate iOS and Android builds. Our modern cross-platform engineering ships in 4 to 8 weeks at roughly 20% below standard agency benchmarks:
Cross-Platform Mobile MVP (4 to 6 weeks): $18,000 to $36,000 (unified iOS & Android app, auth, core user workflows, API integration, App Store submission)
Production Mobile Platform (6 to 9 weeks): $36,000 to $68,000 (push notifications, RevenueCat in-app subscriptions, offline SQLite sync, real-time chat)
Native Codebase or Flutter Migration (4 to 7 weeks): $24,000 to $48,000 (migrating fragmented Swift/Kotlin or Flutter apps into a clean React Native codebase)
Performance Audit & 60fps Optimization Sprint: $3,500 to $7,500 (fixing memory leaks, dropped frames, and cold startup delays in existing apps)
Fixed deliverables, full EAS build configurations, complete GitHub repository ownership, and 30 days of post-launch monitoring.
| Architecture Layer | Stack & Specifications |
|---|---|
Core Framework | React Native 0.76+ (New Architecture, Fabric, TurboModules), React 19, TypeScript |
Build & Tooling | Expo SDK 52+, Expo Application Services (EAS), Custom Dev Builds (CNG) |
Native Languages | C++ (JSI), Swift (iOS), Kotlin (Android) |
Storage & Sync | WatermelonDB, SQLite, MMKV high-speed key-value cache, TanStack Query |
Monetization & Push | RevenueCat, Apple StoreKit 2, Google Play Billing, OneSignal, Firebase Cloud Messaging |
Yes, 100%. React Native compiles directly to genuine native platform components (UIKit on iOS, Views on Android). Scrolling, haptic feedback, and fluid 60fps animations are indistinguishable from apps written in pure Swift or Kotlin.
Our rates run roughly 20% below traditional agency benchmarks because building a single cross-platform codebase eliminates duplicate native engineering. A focused mobile MVP costs $18,000 to $36,000 (4 to 6 weeks); a full-featured commercial app costs $36,000 to $68,000 (6 to 9 weeks).
Most mobile MVPs launch on the Apple App Store and Google Play in 5 to 8 weeks. We provide TestFlight (iOS) and Internal Track (Android) builds each week so you can test features on your physical phone as we build.
Yes. We manage privacy manifests, permission disclosures, Apple review guidelines, and test credentials. If either store requests modifications during review, we resolve them immediately at no extra cost.
Yes. We engineer offline-first data architectures using local SQLite databases and optimistic UI updates, automatically syncing changes to the cloud once connectivity restores.
Yes. With Expo EAS Over-the-Air (OTA) updates, JavaScript bug fixes, copy revisions, and styling updates deploy directly to users' phones in seconds, bypassing store review delays for non-native changes.
React Native uses TypeScript and React, the largest developer talent pool globally. It renders authentic native operating system components rather than drawing simulated widgets on a canvas like Flutter, ensuring superior platform compliance and accessibility.
Yes. Codebase unification is a core specialty. We migrate existing fragmented apps into a single, clean React Native codebase, drastically cutting your future maintenance expenses.
We integrate RevenueCat and Apple StoreKit 2 / Google Play Billing, providing rock-solid receipt verification, paywall A/B testing, and cross-platform subscription syncing.
You own 100% of the GitHub repository, build pipelines, and store deployment keys from day one. You maintain root ownership of your Apple Developer and Google Play accounts.
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