Mobile App Development Company for iOS & Android
We design and engineer production-grade iOS, Android, and cross-platform apps with millisecond touch-latency, offline-first sync, and enterprise hardware security. From zero to top-10 App Store rankings.
Built for Mobile Scale & Flawless UX
We replace sluggish web-wrapper apps with high-velocity mobile engineering built for offline resilience, hardware security, and high app store ratings.
Offline-First Local Sync & Conflict Resolution
We build with SQLite and WatermelonDB local vaults. Users never stare at loading spinners: writes happen instantly with optimistic UI mutations and sync seamlessly when connectivity restores.
Native 120Hz ProMotion & Jitter-Free Rendering
Zero frame drops. We leverage Metal hardware acceleration, Reanimated 3 worklets running directly on the UI thread, and pre-compiled shaders to deliver smooth 60–120 FPS interactions.
Hardware Security & Biometric Keychain
Bank-grade mobile defense: Apple Secure Enclave, Android KeyStore hardware backing, TLS certificate pinning, payload AES-256 encryption, and jailbreak/tamper detection.
Automated Store Compliance & Zero-Downtime OTA
100% App Store and Google Play guideline compliance. Automated Fastlane CI/CD pipelines, privacy manifests, and Over-The-Air (OTA) updates for instant zero-review bug hotfixes.
Native Performance Across Every OS
Whether you need pure Swift/Kotlin performance or high-velocity React Native shared code, we architect your mobile stack for longevity, zero-lag rendering, and instant responsiveness.
Pixel-Perfect, Zero-Overhead Swift & SwiftUI Builds
We build native iOS applications leveraging Swift 6 concurrency, SwiftUI declarative state, Metal hardware rendering, and CoreML. Designed exclusively for iOS, iPadOS, and watchOS to take full advantage of Apple Silicon.
import SwiftUI
import StoreKit
struct CheckoutView: View {
@StateObject private var vm = OrderViewModel()
var body: some View {
VStack(spacing: 20) {
FaceIDBiometricButton {
Task { await vm.processSecurePayment() }
}
.clipShape(Capsule())
.sensoryFeedback(.success, trigger: vm.isSuccess)
}
}
}The 5-Layer Mobile Engineering Stack
Every production app we build is backed by clean separation of concerns, offline persistence, and enterprise security standards.
Gesture, UI & Motion Pipeline
60–120 FPS hardware-accelerated animations using Metal (iOS), RenderThread (Android), and Reanimated 3 C++ worklets with zero frame drops.
Deterministic Reactive State
Clean Architecture separation ensuring pure business logic is decoupled from presentation. Predictable unidirectional state flows with offline replay.
Offline-First Engine & Local Vault
Local-first persistence via SQLite, MMKV and WatermelonDB. Automatic background sync queues, conflict resolution (CRDTs), and optimistic mutations.
Zero-Trust Mobile Security
Defense-in-depth protection: Secure Enclave biometric authentication, TLS 1.3 certificate pinning, payload encryption, and jailbreak/root detection.
Telemetry, CI/CD & OTA Updates
Automated continuous delivery pipelines via Fastlane and GitHub Actions with real-time crash diagnostics, ANR alerts, and instant Over-The-Air code pushes.
The 4-Sprint Mobile Engineering Lifecycle
A structured, sprint-based delivery cycle taking your concept from interactive Figma UX to validated, reviewed App Store & Google Play distribution.
Architecture & Interactive Figma UX
We architect the technical foundation, map user interaction flows, design tokenized mobile components, and define local-first database schemas.
Core Native Engine & Offline Sync
We build native scaffolding, integrate SQLite / MMKV local persistence, implement reactive state management, and connect backend REST/GraphQL streams.
Hardware Integration & Automated Testing
We hook into device hardware (biometrics, CameraX, push notification APNs/FCM, Apple Pay) and run automated Maestro E2E test suites across 20+ device profiles.
App Store Submission & Production Telemetry
We manage end-to-end Apple and Google Play reviews, configure Fastlane release pipelines, and deploy Sentry crash reporting with Datadog RUM.
Engineered for Demanding Mobile Verticals
From high-concurrency fintech ledgers to real-time telehealth video, we build apps that perform where downtime or crashes mean lost revenue.
High-Throughput Fintech & Banking
Banking-grade security with real-time transaction ledgers, biometrics, Apple/Google Pay, and multi-factor hardware tokens.
On-Device Edge AI & Voice Models
Embed machine learning directly into your mobile app using CoreML and TensorFlow Lite for zero-latency, private offline inference.
Offline-First Field & Enterprise Apps
Built for field operations and enterprise teams in low-connectivity zones. Automatic background syncing when connection restores.
High-Conversion Mobile Commerce
Frictionless shopping experiences with 1-tap checkout, personalized AI recommendation carousels, and smart retention push triggers.
Telehealth & Secure Healthcare Apps
Medical-grade mobile software featuring end-to-end encrypted video consultations, vitals tracking, and encrypted patient vaults.
Legacy App Re-Architecture & Rebuilds
Revitalize sluggish legacy apps or slow hybrid web wrappers into modern, fluid React Native or native Swift/Kotlin architectures.
How Different Mobile Approaches Compare
Choosing the right stack balances developer speed, runtime smoothness, and budget.
| Performance Metric | React Native (New Arch) | Native iOS (Swift) | Flutter (Impeller) | Hybrid WebView Wrapper |
|---|---|---|---|---|
| Rendering Engine | Fabric C++ Direct JSI | Metal CoreAnimation | Vulkan Impeller | DOM WebKit Engine |
| Frame Rate (FPS) | Steady 60–120 FPS | Steady 120 FPS | Steady 60–120 FPS | Frequent Drops (30–45 FPS) |
| Code Sharing | 90% – 95% Across iOS & Android | 0% (iOS Exclusive) | 90% – 95% | 100% |
| Over-The-Air (OTA) Updates | Instant via EAS / CodePush | Requires Store Review | Limited Code Push | Instant but Slow UX |
| Time-to-Market | 2x Faster Time-to-Market | Standard (2 Sprints) | 2x Faster | Fast but Poor UX |
Production Mobile Case Studies
Explore flagship mobile applications engineered by Amethyst Developers for iOS and Android.
Tika — Video Platform & Live Stream
60 FPS vertical video feed, native video caching, and interactive creator engagement built with Flutter.
JACO — Low-Latency Live Streaming
WebRTC real-time broadcast engine, interactive live gifting, and audience chat running at sub-200ms latency.
eTaka — Digital Banking & P2P Wallet
Biometric Secure Enclave authentication, QR merchant checkout, and instant ledger balance synchronization.
Frequently Asked Questions
Everything you need to know about engineering, timelines, and store approvals.
It depends on your product scope. If you require deep Bluetooth hardware drivers, custom GPU rendering, or heavy 3D graphics, Native Swift and Kotlin provide direct hardware access. For most modern digital businesses, React Native and Flutter offer 60 FPS performance, shared business logic across iOS and Android, and a faster time-to-market. We evaluate your feature roadmap and recommend the optimal stack during architecture discovery.