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Mobile apps

iOS and Android apps that hold up on real phones.

iOS and Android apps built once with React Native or Flutter, or natively when it matters, and shipped to both stores.

  • React Native
  • Flutter
  • Swift
  • Kotlin
Service overview

iOS and Android apps that stay fast on real phones and real networks.

What it is

  • A booking app with payments and reminders
  • iOS and Android apps, cross-platform or native
  • Flutter, React Native, Swift and Kotlin
  • Back end, admin panel and store launch included

The problem it solves

  • Slow sign-up and failed verification codes
  • Payments that fail at the last step
  • Screens that freeze on older phones
  • Apps that break when the network drops

Who needs it

  • Startups that need an MVP
  • Companies with an app to fix or take over
  • Businesses taking their app to users abroad
  • Agencies that need a delivery partner

Why it matters

  • Customers book, buy and pay on their phones first
  • Users decide within the first minute
  • Store review and privacy rules keep changing
  • Lost users are hard to win back
The problem

Why so many apps lose their users.

These are the problems that usually lead a business to look for app developers.

  • Slow, crashing or dated apps

    Screens freeze on older phones, the app crashes after an OS update or it looks years behind competitors. Reviews drop and people uninstall.

  • Login and payment failures

    Verification codes that don’t arrive and payment sheets that fail lose people at the exact moment they were ready to sign up or buy.

  • Stuck with the original developer

    The person who built the app has moved on, the code is undocumented and nobody knows whether the store accounts, back end or source code are really yours.

  • Two apps, twice the work

    Separate iOS and Android codebases drift apart, so features ship on one platform first and every fix costs double.

What it costs the business

  • Customers who uninstall rarely come back.
  • Poor reviews make new users skip your app in the store.
  • Orders and bookings fall back to calls, messages and manual work.
  • Store rejections delay launches and updates.

You probably need this if

  • Your app store rating is falling, or reviews mention crashes.
  • Customers still phone or message to book, order or check status.
  • Your field team fills in paper forms or spreadsheets.
  • A new iOS or Android version broke something in your app.
  • You can’t reach the developer who built your app.
  • Your competitors have an app and you don’t.
What’s included

iOS and Android app development services we offer.

  • 01

    Cross-platform apps

    One codebase for iOS and Android with Flutter or React Native, so both versions ship together and stay in step. It suits most business, e-commerce, booking and content apps, and costs less to maintain than two separate apps.

  • 02

    Native iOS and Android apps

    Swift for iOS and Kotlin for Android when you need the last bit of performance or close access to platform features such as Bluetooth devices, background location, widgets or heavy camera work.

  • 03

    MVPs for startups

    A focused first version with the few features that prove your idea, built to test with real users before you invest further.

  • 04

    Back end, APIs and admin panels

    Authentication, databases, push notifications, payments through Stripe, Apple Pay, Google Pay, PayPal or Razorpay and UPI, and the APIs that connect them, built on Firebase or Node.js. We can host the back end in a region near your users, such as the EU, the US, the Middle East or India, and add a web admin panel so staff can manage users, orders and content.

  • 05

    App Store and Play Store launch

    Store listings, screenshots, privacy details, review guidelines and release management for both stores, in each country you launch in.

  • 06

    App maintenance and updates

    Updates for new iOS and Android versions, crash monitoring, dependency and security updates, and new features after launch. We also take over existing apps from other developers, starting with a written review of the code.

Everything we do

Apps for every platform and purpose.

Native or cross-platform, consumer or business, from a first version to a full product with its own back end and admin panel.

Platforms

  • Cross-platform apps with Flutter
  • Cross-platform apps with React Native
  • Native iOS apps (Swift, SwiftUI)
  • Native Android apps (Kotlin, Jetpack Compose)
  • Progressive web apps
  • Tablet, wearable and TV apps

App types

  • E-commerce and shopping apps
  • Booking and on-demand service apps
  • Food delivery and restaurant apps
  • Fintech and payment apps
  • Health, fitness and wellness apps
  • Education and e-learning apps
  • Social and community apps
  • Field-team and enterprise apps

Features

  • Login with OTP, email or social accounts
  • In-app payments and subscriptions
  • Push notifications
  • Maps, location and tracking
  • Chat, voice and video calls
  • Offline mode and sync
  • AI features and chatbots

Back end and admin

  • APIs and back end
  • Web admin panels
  • Firebase and Supabase set-up
  • Analytics and crash reporting

Launch and growth

  • App Store and Google Play publishing
  • App store optimisation (ASO)
  • App install campaigns
  • Maintenance, updates and OS upgrades
  • Taking over and fixing existing apps
What you gain

What a well-built app does for your business.

An app people keep on their phone becomes a direct line to your customers.

  • A direct channel to your customers

    Your business sits on the customer’s home screen, with push notifications and in-app offers that don’t depend on ads or algorithms.

  • Lower cost to build and maintain

    One Flutter or React Native codebase for iOS and Android means both apps ship together and every update is made once.

  • More orders, bookings and repeat use

    Quick sign-up, saved details and in-app payments and subscriptions make it easier to buy again, book again and come back.

  • Less manual work for your team

    Bookings, orders, payments and field reports flow straight into your back end and admin panel instead of being typed in from calls and paper.

  • An app your users enjoy using

    Fast screens, clear flows, offline mode where it matters and support for their language make the app easy to use on any phone.

How it runs

From idea to an app live in both stores.

An MVP typically takes four to eight weeks; a full app, eight to sixteen. You install test builds on your own phone as the work progresses, so you are never waiting until the end to see it.

  1. 1

    Days 1–3

    Discovery

    We go through your idea, your users, the countries you are launching in and the screens they need. You get a feature list for the first release.

  2. 2

    Within 7 working days

    Scope and proposal

    A written scope with features, platforms, back end, timeline, price and what is out of scope. An NDA is signed before the first call, so you can share your idea openly.

  3. 3

    Week 1–3

    UX and UI design

    User flows and wireframes first, then full screen designs in Figma with a clickable prototype. You approve how the app looks and works before development starts.

  4. 4

    Week 3 onward

    Build and test builds

    We build the app and its back end in short cycles. You get new builds through TestFlight on iPhone and Play Store internal testing on Android, try them yourself and send feedback when it suits you. We test on older phones and slow networks as well as new devices.

  5. 5

    Launch weeks

    Store launch and handover

    We submit the app to the App Store and Play Store under your developer accounts and handle the review process. Source code, admin panel access, documentation and every login are handed over to you.

Who it’s for

Who our app development is for.

Our app work is set up for four kinds of client, and each needs something different from us.

  • Startups in the US, UK, Gulf and Australia

    You need a working app in users’ hands quickly, built by senior developers at Indian rates rather than local agency prices. We scope a lean MVP, build it cross-platform and set up analytics so you can see what people actually use.

  • Agencies that need a delivery partner

    You win app projects but don’t have the developers to build them. We work as an offshore, white-label partner under NDA, delivering to your standards while you keep the client relationship.

  • Companies with an existing app

    Your app is slow, crashes, gets poor reviews or the original developer has moved on. We audit the code, fix what is urgent, update it for current store requirements, and then maintain or rebuild it, depending on what the review shows.

  • Indian businesses going international

    Your app works at home and you want users abroad. We add international payments, multiple languages including right-to-left Arabic, accessibility for markets that expect it, and back-end hosting closer to your new users.

What you get

Deliverables, in writing.

Every engagement starts with a written scope that lists these, with dates and a price.

  1. Product scope and flows
  2. UI design
  3. iOS and Android builds
  4. Store submission and handover

Tools

Technologies we build with.

Cross-platform

  • Flutter
  • Dart
  • React Native
  • Expo

Native

  • Swift
  • SwiftUI
  • Kotlin
  • Jetpack Compose

Back end

  • Firebase
  • Supabase
  • Node.js
  • Laravel
  • Python

Services

  • Stripe
  • Razorpay
  • Google Maps
  • OneSignal
  • Twilio
  • Agora
Why Amionyx

Why hire app developers from Amionyx.

  • The app on your phone throughout

    New builds arrive through TestFlight and Play Store internal testing as the app grows, so you judge it by tapping through it yourself instead of looking at screenshots.

  • Flutter, React Native, Swift or Kotlin

    We build cross-platform with Flutter and React Native, or natively in Swift and Kotlin, and explain the trade-off so the choice fits your features, budget and timeline.

  • Tested on the phones your users own

    The developer who builds a screen also tests it on older, cheaper phones and slow connections, because that is where sign-up codes, maps and payment sheets usually fail.

  • The same developers from idea to store

    The person you explain your idea to designs, builds and submits the app, at a lower cost than an app agency in the US or UK. They also answer the store reviewers, so nothing is lost in a handover.

  • Built for your users and markets

    Local payments, languages, right-to-left layouts and store privacy details are planned from the first design. The app, code and store accounts are in your name.

Pricing

How much does it cost to build an app?

The cost of an app depends mostly on its features, the platforms it runs on and what sits behind it, not on the number of screens alone. After a short call we send a written quote, so you know the full cost before anything starts. Apple and Google developer account fees are paid by you directly to Apple and Google, since the accounts belong to you.

Starting from $49

Get a written quote
  • Fixed-price MVP

    For a first version with a clearly defined set of features. One price for the agreed scope, paid in milestones.

  • Fixed-price full build

    For a complete app with its back end and admin panel, scoped in detail up front and delivered in milestones.

  • Hourly or monthly development

    For apps that keep growing after launch. A developer or small team for an agreed number of hours each month.

  • Maintenance plans

    A fixed monthly fee for OS updates, crash monitoring, security updates and a set amount of small changes.

What changes the cost of an app

  • One platform or both iOS and Android
  • Cross-platform (Flutter, React Native) or native (Swift, Kotlin)
  • Back end and admin panel: new, or connecting to an existing system
  • Payments and integrations: Stripe, Apple Pay, Google Pay, PayPal, Razorpay, maps, messaging
  • Offline mode and data sync
  • Languages, including right-to-left Arabic
  • Accessibility, privacy and data residency needs in your markets
FAQ

Mobile app development: questions we’re asked.

Working with us from abroad? Time zones, contracts, payments and NDAs, answered in one place. How we work with international clients

  • Flutter and React Native are widely used in India, so experienced cross-platform developers are easier to find and senior time costs less than at most app agencies in the US or UK. With us you install test builds on your own phone as the app takes shape, and the code and store accounts stay in your name.

  • It depends on the features, whether you need iOS, Android or both, whether the app is cross-platform or native, and how much back end and admin panel it needs. A focused MVP costs far less than a full app with payments, offline mode and several user roles. We send a fixed written quote after a short call, before any work starts.

  • An MVP typically takes four to eight weeks, and a full app eight to sixteen weeks, depending on features and how quickly designs are approved.

  • Flutter and React Native are both solid choices for most apps, and one codebase for both platforms saves time and money. We pick between them based on your features, timeline and any existing team or code. Native Swift and Kotlin make sense when the app depends on heavy platform features or maximum performance, and we explain the trade-off before you decide.

  • Start with the platform most of your customers use, which your website analytics or customer records can usually show. With Flutter or React Native, launching on both adds relatively little, so the question matters most for native apps. We look at your data with you before recommending one.

  • Rejections are common and usually fixable: Apple names the guideline the app breaks, such as missing privacy details, a login the reviewer couldn’t use or in-app payment rules. We fix the issue, reply in App Store Connect and resubmit. We also check the review guidelines before the first submission to avoid the usual causes.

  • It depends on how many features, integrations and third-party services the app has, and how often you want new features. Every app needs updates for new iOS and Android versions, security and dependency updates and crash monitoring, plus back-end hosting that you pay for directly. Our maintenance plans cover the work for a fixed monthly fee, agreed after we have seen the app.

  • Yours. The app is published under your own Apple and Google Play developer accounts, and you pay the account fees directly to Apple and Google. We handle the submission, store listings and review process with access you grant, and you can remove that access at any time.

  • Yes. We build multilingual apps with right-to-left layouts for Arabic (translations supplied by your translator), and connect payments through Stripe, Apple Pay, Google Pay, PayPal or Razorpay and UPI, depending on where your users are. We also consider privacy laws such as GDPR when designing how the app collects and stores data.

  • Yes. We start with a written review of the code, back end and store accounts, telling you what works, what is risky and what needs fixing first. Then we maintain it, or recommend a rebuild only if that would cost less.

Go deeper

  • Start here

    Start here

    A plain guide for founders with an idea: what happens, in what order, and what it costs.

  • For CTOs and technical buyers

    How we build

    Our software development process: code review, tests, CI/CD, environments, security and handover.

  • Industries · SaaS

    SaaS

    MVPs, multi-tenant web apps, billing, AI features and the marketing that brings in sign-ups.

  • For agencies and consultants

    Partners

    White-label development, design, marketing and AI delivery for agencies and consultants.

Related services

Often paired with.

Start a project

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hello@amionyx.com+91 79995 86236WhatsAppBook a callOffice: 201, D15, Shree Ji Valley, Indore, Madhya Pradesh, India
  • Written scope and price
  • Direct access to the team
  • NDA before the first call
  • No lock-in contracts

— The Amionyx founders

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