Mobile

iOS, Android, and cross-platform apps — built to last.

Mobile app development — native Swift & Kotlin or Flutter & React Native. 30+ apps shipped, 4.7+ store ratings, <0.1% median crash-free rate.

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MyApp · iOS 18 · Pixel 9

live

Crash-free user rate

Cold start412 ms
Time to interactive1.1 s
Crash-free users (7d)99.93%
Daily active27,402
Store rating4.8 / 5

Day-7 retention since v3+38%

Building withFlutterReact NativeSwift / SwiftUIKotlin / Jetpack ComposeFirebaseSupabaseFastlane

Overview

Mobile is a long game. The teams who keep their app rating above 4.7 in year three aren't the ones who shipped fastest at launch — they're the ones who shipped with clean architecture, real test coverage, a release pipeline they can drive without the original developer, and a crash dashboard they actually open. We design and engineer for that team. 30+ apps shipped to production, 4.7+ average store rating, sub-0.1% median crash-free user rate, and an AI-native mobile practice that handles streaming responses, on-device inference, voice input, and graceful offline fallbacks.

The stack choice is honest: Flutter when you want visual polish and consistent rendering across iOS and Android, React Native when you already have a React team or heavy web reuse, native Swift / SwiftUI for App Store-driven polish or deep OS integration, native Kotlin / Jetpack Compose for Android-first builds with serious longevity. App Store and Play Console setup, CI/CD pipelines (Fastlane), crash reporting (Sentry), analytics (Mixpanel) — wired from day one, not as a phase 2 cleanup. Six-week target from kickoff to a working v1 on one platform; ten weeks for native iOS + Android shipped together.

Outcomes

30+
mobile apps shipped to production
<0.1%
median crash-free user rate after launch
4.7+
average store rating across our shipped apps

Quick definition

What does a mobile app development company do?

A mobile app development company designs, engineers, ships, and maintains iOS and Android applications — choosing between cross-platform (Flutter, React Native) and native (Swift, Kotlin) stacks based on the product roadmap, performance needs, and the team that will own the app long-term. A good mobile partner wires release pipelines, analytics, and crash reporting from day one — not after launch.

What we deliver

What you actually get.

Cross-platform Flutter

Single codebase, native performance, pixel-perfect across iOS and Android. Best fit for fast-moving consumer or B2B apps.

Cross-platform React Native

When you already have a React team or want maximum reuse with your web codebase. Architecture and native modules done properly.

Native iOS (Swift)

For apps that need deep OS integration, peak performance, or App Store-driven polish. SwiftUI-first, MVVM, modern toolchain.

Native Android (Kotlin)

Jetpack Compose, coroutines, modular architecture. Built for the long-term Android maintainer, not just launch day.

AI-native mobile

Streaming responses, on-device inference, voice input, multimodal capture, and graceful offline fallbacks.

Backend, DevOps & release

API design, App Store/Play Console setup, CI/CD pipelines, crash reporting, and analytics wired from day one.

How it fits together

A picture of the whole system.

The shape of every engagement — three lanes from data to delivery, with the parts most teams skip already wired in.

Client

Flutter / RN / Native

type-safe SDKs

Offline-first

Drift · Realm

Auth + biometric

secure enclave

API

GraphQL / tRPC

type-shared

Realtime

WebSocket · SSE

Push + notifications

APNs · FCM

Ops

Fastlane CI/CD

auto submit

Crashlytics · Sentry

auto-attached

Mixpanel · GA4

behavioural

Proof

A real build we shipped.

EdTech · Series A

Mockinto

47%

lift in user completion rate

Featured case · EdTech · Series A

An AI interviewer that actually adapts to the candidate.

A multi-turn interview agent that adjusts difficulty in real time, scores answers against a rubric, and gives structured feedback in under two seconds.

Claude SonnetRAGFlutterStreaming

Read the full case

“

Our voice agent went from prototype to handling 4,000 calls/day in six weeks. Aiinfox owned the whole stack.

Head of Operations

Insurance, EU

Tools

The stack we wield.

FlutterReact NativeSwift / SwiftUIKotlin / Jetpack ComposeFirebaseSupabaseFastlaneSentryMixpanelGraphQL

FAQ

Questions teams actually ask.

Flutter or React Native — which should we choose?

Flutter for visual polish, consistent rendering across platforms, and a fast iteration cycle. React Native if you have a React team, heavy web reuse, or existing native modules to integrate. We recommend based on your team and roadmap — not what's trending.

Do you build native iOS and Android apps?

Yes. Native Swift / SwiftUI for iOS-first builds needing deep OS integration or App Store-driven polish. Native Kotlin / Jetpack Compose for Android-first builds. We pick native when cross-platform would compromise the product — not by default.

How long does mobile app development take?

Six weeks for a working v1 on one platform (iOS or Android, or one cross-platform build). Ten to twelve weeks for native iOS and Android shipped together. Pilots and internal-track releases ship in three to four weeks.

Do you handle App Store and Play Store submission?

Yes — account setup, metadata, screenshots, app review responses, and post-launch update releases. We can ship under your accounts or ours during testing. We also handle Apple's privacy nutrition labels and Google's data safety form.

How much does mobile app development cost?

Fixed-price scopes. A focused v1 on one platform typically lands between $35,000 and $90,000. Cross-platform Flutter v1 is usually $55,000 to $120,000. Native iOS + Android shipped together is $80,000 to $200,000 depending on complexity.

What about ongoing maintenance after launch?

Optional retainer for OS version compatibility (iOS / Android annual releases), SDK upgrades, App Store and Play policy changes, incident response, and crash investigation. Most clients keep us on a one-day-per-week retainer for the first six months post-launch.