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Apps · Android & iOS

Mobile apps people keep, for Android and iPhone.

A good app is smooth, works on weak networks, and earns its place on the home screen. We design and build Android and iPhone apps from one plan, publish them under your own store accounts, and keep improving them after launch. Below is what we build, what is inside an app, and every technology we use, in plain words.

iOS + Android
from one codebase
Your name
on the store listings
100%
code is yours
From idea to both app stores
  1. 1

    Design the flow

    Week 1

    Every screen drawn and tapped through as a prototype

    Figma · prototype · user flow

  2. 2

    Build once

    Weeks 2–7

    One codebase becomes the iPhone and Android apps

    Flutter or React Native · API

  3. 3

    Test on real phones

    Weeks 7–8

    Real devices, real networks, before anyone else sees it

    TestFlight · Play testing · automated tests

  4. 4

    Publish & grow

    Launch

    Live on the App Store and Google Play, then improved

    App Store · Google Play · analytics

✓ You see a working app on your own phone every week, long before launch day.

What we build

Mobile apps, six ways.

Apps come in many shapes. Find the kind closest to your idea, and we will shape it from there.

  • Shop & marketplace apps

    Browse, pay and track orders: carts, wallets, UPI and cards, and push offers that bring people back.

    Good for
    Retail, direct-to-consumer brands, marketplaces
    Typical
    8–14 weeks
    Built with
    Flutter or React Native · Firebase · Razorpay
  • Booking & on-demand apps

    Book a service, watch it arrive on a live map, pay and rate it: the pattern behind taxis, deliveries and home services.

    Good for
    Salons, clinics, home services, delivery
    Typical
    10–16 weeks
    Built with
    React Native · Node · PostgreSQL · maps
  • Health & fitness apps

    Plans, tracking, reminders and wearable data, designed to build a habit and to protect private information.

    Good for
    Gyms, coaches, clinics, wellness brands
    Typical
    8–14 weeks
    Built with
    Flutter or native · HealthKit · Health Connect
  • Field & team apps

    Private apps for your staff: tasks, checklists, photos and signatures that work with no signal and sync later.

    Good for
    Operations, logistics, inspections
    Typical
    6–10 weeks
    Built with
    Flutter · SQLite · sync API
  • Community & social apps

    Profiles, feeds, chat and notifications that give people a reason to open the app every day.

    Good for
    Communities, creators, events, education
    Typical
    10–16 weeks
    Built with
    React Native · Supabase · push
  • AI & companion apps

    Assistants, camera-and-AI scanners, and phone companions for your hardware or web product.

    Good for
    Products that need a presence on the phone
    Typical
    6–12 weeks
    Built with
    Flutter or React Native · FastAPI · AI models

What's inside an app

Four layers. Every app has them.

An app looks like one thing on the screen, but four layers do the work. Knowing them makes every quote, every choice and every conversation with us easier.

A simple content app needs a light brain and few phone features. A booking or marketplace app needs all four to be strong. We size each layer to your goal, so you never pay for what you do not need.

  1. 01

    The screens

    Interface

    Everything people see and touch: screens, buttons, swipes and animation. It has to feel smooth at 60 frames a second on an ordinary phone.

    What this layer does

    • Feels natural on iPhone and on Android
    • Responds instantly to touch and gestures
    • Adapts to every screen size, light and dark mode

    We use

    • Flutter
    • React Native
    • SwiftUI
    • Jetpack Compose
  2. 02

    The brain

    App logic & server

    The rules behind the screens: accounts, orders, payments and notifications. Part runs in the app, part on a server in the cloud.

    What this layer does

    • Keeps accounts and payments safe
    • Applies your rules the same way every time
    • Talks to your other systems and services

    We use

    • Dart
    • TypeScript
    • Kotlin
    • Swift
    • Node.js
    • Python
  3. 03

    The phone's powers

    Device features

    Everything a phone can do that a website cannot: camera, location, push notifications, Face ID, Bluetooth, and working without a signal.

    What this layer does

    • Sends push notifications that matter
    • Uses camera, GPS and biometrics
    • Keeps working offline and syncs later

    We use

    • Push (APNs · FCM)
    • Camera
    • Biometrics
    • SQLite
  4. 04

    The stores

    Release & updates

    How the app reaches people: the App Store and Google Play, the review process, the test versions, and the updates that follow.

    What this layer does

    • Passes store review the first time
    • Tests with real users before launch
    • Ships updates and fixes after launch

    We use

    • App Store
    • Google Play
    • TestFlight
    • Fastlane

The full toolbox

Every language and tool, explained.

47 technologies in 6 groups, in plain words: what each one is, what we use it for, and where it has limits. Tags show which are rising right now.

  • Trendinggaining momentum now
  • Industry standardthe safe default
  • Steadyproven, not changing fast
  • Worth watchingpromising, not yet mainstream

Languages

The language follows the framework. What matters is how fast the app feels and how easily we can keep improving it.

Nothing in this group is trending right now. Switch the filter off to see everything.

  • Dart

    Trending

    The language behind Flutter. Easy to read, fast to run, and one codebase reaches iPhone, Android and more.

    Use it for
    Flutter apps
  • TypeScript

    Trending

    JavaScript with types, so many mistakes are caught while we write. It powers React Native apps and the servers behind them.

    Use it for
    React Native apps and API servers
    Trade-off
    A little more typing up front, far fewer bugs later.
  • Kotlin

    Industry standard

    Google's preferred language for Android, concise and safe. It can also share logic with iPhone through Kotlin Multiplatform.

    Use it for
    Native Android apps and shared logic
  • Swift

    Industry standard

    Apple's language for iPhone, iPad, Watch and Mac, with first-class access to every Apple feature.

    Use it for
    Native iPhone apps and Apple-only features
  • Java

    Steady

    The older Android language, still found in many existing apps and in large company back ends.

    Use it for
    Maintaining existing Android code
  • C# (.NET)

    Steady

    Microsoft's language, used for apps with .NET MAUI and for strong back ends.

    Use it for
    Teams that already work in .NET

App frameworks

The framework decides how many apps we have to build, how they look and feel, and how much it all costs.

Nothing in this group is trending right now. Switch the filter off to see everything.

  • Flutter

    Trending

    Google's toolkit that draws every pixel itself, so the app looks and runs the same on iPhone and Android, and can reach web and desktop too.

    Use it for
    Custom-designed apps with rich animation
    Trade-off
    Apps are a little larger, and the ecosystem is Dart-only.
  • React Native & Expo

    Trending

    Builds real native screens using JavaScript and TypeScript. Expo adds build and update tools that make shipping quicker.

    Use it for
    Teams that also build for the web
  • Swift + SwiftUI

    Industry standard

    Native iPhone and iPad apps, with the newest Apple features first and the best polish.

    Use it for
    iPhone-first apps that must feel perfect
  • Kotlin + Jetpack Compose

    Industry standard

    Native Android apps with Google's modern toolkit, with the best polish and access to everything.

    Use it for
    Android-first apps and deep device features
  • Kotlin Multiplatform

    Trending

    Share the rules and data code between Android and iPhone while keeping fully native screens.

    Use it for
    Native quality with less duplicated work
  • Ionic & Capacitor

    Steady

    Wrap a web app in a native shell so it can live in the stores and use the camera and other features.

    Use it for
    Turning an existing web app into an app
  • .NET MAUI

    Steady

    Microsoft's cross-platform toolkit for iPhone, Android, Windows and Mac in C#.

    Use it for
    .NET teams building for several systems
  • Progressive web apps

    Steady

    A website that installs to the home screen and can work offline. No store needed, but fewer phone features.

    Use it for
    Simple tools and quick launches

Back end & cloud

Most apps need a server for accounts, data and notifications. We choose the lightest option that will still grow with you.

Nothing in this group is trending right now. Switch the filter off to see everything.

  • Firebase

    Industry standard

    Google's ready-made back end: sign-in, database, file storage, push messages and crash reports in one place.

    Use it for
    Launching fast, small teams
    Trade-off
    Great to start, so we plan the exit route early.
  • Supabase

    Trending

    A ready-made back end built on PostgreSQL, with sign-in, files and live updates.

    Use it for
    Apps that want a real SQL database from day one
  • Custom API

    Industry standard

    A server built to your needs in Node.js, Python (FastAPI) or Go, when ready-made services are not enough.

    Use it for
    Complex rules, large scale or special integrations
  • REST & GraphQL

    Industry standard

    The standard ways an app asks a server for data and saves it.

    Use it for
    Every app that talks to a server
  • Real-time & chat

    Industry standard

    WebSockets and live databases push updates instantly: messages, order status, live locations.

    Use it for
    Chat, live maps and shared screens
  • Cloud storage & CDN

    Industry standard

    Photos, videos and files stored cheaply and delivered quickly from a location near each user.

    Use it for
    Uploads, media and downloads
  • Serverless functions

    Trending

    Small pieces of server code that run only when needed, so you pay only for what you use.

    Use it for
    Notifications, payments hooks and light back ends
  • Admin dashboard

    Industry standard

    A web panel for your team to manage users, orders and content without touching code.

    Use it for
    Running the app day to day

Phone features

These are the reasons people want an app instead of a website. We use the ones that help your goal and skip the rest.

Nothing in this group is trending right now. Switch the filter off to see everything.

  • Push notifications

    Industry standard

    Messages that reach people on their lock screen through Apple's and Google's systems.

    Use it for
    Order updates, reminders and re-engagement
    Trade-off
    Used well they help, used badly people turn them off.
  • Passkeys & biometrics

    Trending

    Sign in or approve payments with a look or a touch (Face ID, fingerprint), and passkeys replace passwords altogether.

    Use it for
    Secure, quick sign-in
  • Camera, QR & scanning

    Industry standard

    Take photos, scan QR codes and barcodes, and read documents with the phone's camera.

    Use it for
    Check-in, payments, inventory and KYC
  • Location & maps

    Industry standard

    Show where things are with Google Maps, Mapbox or Apple Maps, and react to where the user is.

    Use it for
    Delivery, booking and nearby search
  • Offline mode

    Industry standard

    The app keeps data on the phone, so it works on a train or in a basement and syncs when the signal returns.

    Use it for
    Field work and weak networks
  • In-app purchases & subscriptions

    Industry standard

    Sell digital goods and subscriptions through Apple and Google. RevenueCat helps manage them across both stores.

    Use it for
    Subscription and premium apps
    Trade-off
    The stores take a share of digital sales.
  • Bluetooth, NFC & wearables

    Steady

    Connect to nearby devices, tap to pay or tag, and read data from watches and sensors.

    Use it for
    Hardware companions and health apps
  • Widgets & live activities

    Trending

    Glanceable info on the home screen and lock screen, such as order status or a timer.

    Use it for
    Staying useful without opening the app

Quality & release

A great app that fails review or crashes on one phone model is a bad app. This is how we make sure it ships and stays healthy.

Nothing in this group is trending right now. Switch the filter off to see everything.

  • App Store & Google Play

    Industry standard

    Both stores review every app and update. We prepare listings, screenshots and privacy answers so review goes smoothly.

    Use it for
    Publishing under your own developer accounts
    Trade-off
    Apple charges a yearly developer fee and Google a one-time fee, both in your name.
  • TestFlight & test tracks

    Industry standard

    Private beta versions that you, your team and early users install on real phones before launch.

    Use it for
    Feedback and safe launches
  • CI/CD

    Industry standard

    Fastlane, Expo's EAS, Codemagic and GitHub Actions build, test and upload every version automatically.

    Use it for
    Calm, repeatable releases
  • Over-the-air updates

    Trending

    Send small fixes straight to phones without waiting for store review, where store rules allow (Expo EAS Update, Shorebird).

    Use it for
    Fast fixes after launch
  • Crash & performance monitoring

    Industry standard

    Firebase Crashlytics and Sentry report crashes and slowdowns as they happen, on which phone and which version.

    Use it for
    Fixing problems before reviews suffer
  • Product analytics

    Industry standard

    Firebase, PostHog or Mixpanel show which screens people use and where they drop off.

    Use it for
    Deciding what to improve next
  • Automated testing

    Trending

    Tools like Flutter's test kit, Maestro, Detox, XCTest and Espresso tap through the app like a person, every time we change it.

    Use it for
    Catching bugs before launch
  • Privacy & permissions

    Industry standard

    Apple's privacy labels and Google's data-safety form, plus clear permission requests that people trust.

    Use it for
    Passing review and earning trust

AI & extras

The newest layer: features that make an app smarter, more personal and more useful in the moment.

Nothing in this group is trending right now. Switch the filter off to see everything.

  • AI assistants

    Trending

    A chat or voice assistant inside the app, powered by AI model APIs such as Claude, GPT and Gemini.

    Use it for
    Support, guidance and personalisation
    Trade-off
    Needs guardrails and a human hand-off.
  • Camera + AI

    Trending

    Point the camera and the app understands: reads a bill, identifies a product, checks a document.

    Use it for
    Scanners, onboarding and inspections
  • On-device AI

    Trending

    Small models run right on the phone with Core ML, ML Kit or LiteRT, so they are fast, private and work offline.

    Use it for
    Private, instant features such as text and image recognition
  • Voice & speech

    Industry standard

    Speech-to-text and text-to-speech for hands-free use and for accessibility.

    Use it for
    Dictation, voice notes and assistants
  • Payments

    Industry standard

    Stripe, Razorpay, Apple Pay, Google Pay and UPI for quick, safe checkout.

    Use it for
    Shops, bookings and subscriptions
  • Languages & accessibility

    Industry standard

    Several languages, large text, VoiceOver and TalkBack support, so everyone can use the app.

    Use it for
    Reaching more people and passing review
  • Tablet & foldable layouts

    Steady

    Screens that adapt to iPad, Android tablets and folding phones instead of just stretching.

    Use it for
    Apps used on larger screens
  • Apple Watch & Wear OS

    Worth watching

    A small companion on the wrist for glances, quick actions and health data.

    Use it for
    Fitness, alerts and quick controls

About the tags: they are our judgement from public developer surveys, such asState of JS 2025and theStack Overflow Developer Survey 2025, plus what we see in real projects. They shift every year, and a tool that is not trending can still be exactly the right one.

Which stack for which project

Pick the project. See the stack.

Choose a kind of app and watch the plan appear: the tools we would use, and why each one earns its place.

~/shroytech — plan

$shroytech plan "shop app"

✦ Matching your goal to a stack…

App
Flutter or React Native
→ one codebase for iPhone and Android
Back end
Supabase or Firebase
→ accounts, orders and live stock
Payments
Stripe · Razorpay
→ cards, UPI and wallets
Alerts
Push (FCM + APNs)
→ offers and order updates
Admin
Web dashboard (Next.js)
→ manage products and orders

✓ Plan ready · first version in 8–14 weeks

$shroytech plan "booking app"

✦ Matching your goal to a stack…

App
React Native + Expo
→ fast to build, easy to update
Server
Node.js + PostgreSQL
→ bookings, availability and pricing
Live
WebSockets + maps
→ see the provider arrive in real time
Payments
Stripe · Razorpay
→ pay and tip in the app
Alerts
Push + WhatsApp / SMS
→ reminders and confirmations

✓ Plan ready · first version in 10–16 weeks

$shroytech plan "health app"

✦ Matching your goal to a stack…

App
Flutter or native Swift/Kotlin
→ smooth charts and animation
Health data
HealthKit + Health Connect
→ steps, sleep and heart rate
Reminders
Local notifications
→ work even with no signal
Privacy
Encrypted, consent-based
→ health data is sensitive
Back end
PostgreSQL + API
→ plans, progress and coaching

✓ Plan ready · first version in 8–14 weeks

$shroytech plan "field app"

✦ Matching your goal to a stack…

App
Flutter
→ one app, iPhone and Android
Local data
SQLite
→ works with no signal
Sync
Background sync API
→ uploads when online
Capture
Camera + signatures
→ proof of work on site
Server
FastAPI + PostgreSQL
→ reports and an admin view

✓ Plan ready · first version in 6–10 weeks

$shroytech plan "community app"

✦ Matching your goal to a stack…

App
React Native or Flutter
→ feeds and chat that feel instant
Live
Supabase realtime
→ messages and notifications
Media
Object storage + CDN
→ fast photos and video
Safety
Report, block, moderate
→ required by the stores
Alerts
Push notifications
→ bring people back

✓ Plan ready · first version in 10–16 weeks

$shroytech plan "ai assistant app"

✦ Matching your goal to a stack…

App
React Native or Flutter
→ streaming replies that feel instant
Back end
FastAPI (Python)
→ the home of AI tooling
Model
Claude · GPT · on-device
→ chosen for quality, cost and privacy
Knowledge
pgvector (RAG)
→ answers from your own content
Safety
Guardrails + hand-off
→ a person steps in when needed

✓ Plan ready · first version in 6–12 weeks

Built in, not bolted on

Every app gets these.

Whatever the technology, these six things are part of every app project, and we show you how each one is checked.

  • Smooth and quick

    The app opens fast, scrolls without stutter and does not drain the battery.

    How we check

    We profile start-up time, frame rate, memory and battery use on mid-range phones, not only on the newest ones.

  • Store-ready

    It follows Apple's and Google's rules, so review is smooth and the app is not pulled later.

    How we check

    We check the store guidelines, privacy labels and permission texts before every submission, and handle review feedback for you.

  • Works on weak networks

    People use apps on trains, in lifts and on slow data. The app should not fall over.

    How we check

    We test on throttled networks and in airplane mode, with offline storage and sensible retries where it matters.

  • Private and secure

    Accounts, payments and personal data stay protected, on the phone and on the server.

    How we check

    Secure storage (Keychain and Keystore), encrypted connections, biometric sign-in, and only the data we truly need.

  • Accessible

    People using large text, screen readers or one hand can use it too.

    How we check

    We test with VoiceOver and TalkBack, dynamic text sizes, colour contrast and large touch targets.

  • Yours to keep

    No lock-in. You own what you paid for.

    How we check

    The apps are published under your own Apple and Google developer accounts, and after final payment you own the source code and designs.

How we work

No mystery. Just a clear path from idea to launch.

Five steps, the same every time. You always know what's happening, what's next, and when it's done.

Start with step 01 →
  1. 01Discover

    1–3 days

    A call about your goals, audience and scope. You get a fixed price and timeline before any commitment.

    • Discovery call
    • Scope document
    • Fixed quote
  2. 02Story & Design

    1–2 weeks

    We map the story your product tells, then design every screen and turn it into a clickable prototype.

    • Story map
    • Wireframes
    • UI design
    • Prototype
  3. 03Build

    2–6 weeks

    Clean, fast engineering with a live demo every week, so you see progress instead of waiting for it.

    • Weekly demos
    • Staging link
    • Clean code
  4. 04Test

    ~1 week

    Real devices, real browsers. We test speed, security and every flow, and automate the tests.

    • Device testing
    • Speed audit
    • Automated tests
  5. 05Launch & Grow

    Ongoing

    We ship it, watch the numbers and keep improving it with you after launch.

    • Go-live
    • Analytics
    • Support
    • Iterations

Apps FAQ

App questions, answered.

Still curious? Write to hello@shroytech.com and a real person replies within 24 hours.

Do you build one app for both iPhone and Android?

Usually, yes. With Flutter or React Native one codebase becomes both apps, which saves time and money. If your idea depends on deep, platform-specific features, we may recommend building natively instead, and we will explain why.

Flutter, React Native or native: which will you choose?

It depends on your design, your team and your plans. Flutter suits custom, animated interfaces. React Native suits teams that also build web products. Native suits apps built around one platform's special features. You get the reasons in writing.

Will you publish the app on the App Store and Google Play?

Yes. We publish under your own developer accounts, so the app and its listing belong to you. Apple charges a yearly developer fee and Google a one-time registration fee, which are paid by you directly and listed in your quote.

How long does store review take?

It varies. Often it is a day or two, and sometimes longer, especially for a first submission. We prepare everything to avoid common rejections, and we plan a buffer in your launch date because the stores set the timing, not us.

Will the app work without internet?

It can. We keep data on the phone, so key features work offline, and the app syncs when the signal returns. We decide with you which features need to work offline.

Can you add push notifications and payments?

Yes. We use Apple's and Google's push systems and payment tools such as Stripe, Razorpay, UPI, Apple Pay and Google Pay. Digital goods and subscriptions sold inside the app go through the stores' own billing, which we set up correctly.

How do updates work after launch?

New versions go through the stores like the first one. For small fixes we can often use over-the-air updates, where store rules allow, so changes reach phones within hours. After the first 30 days, a care plan covers updates and monitoring.

Can you build for iPad, tablets or watches too?

Yes. We can adapt layouts for iPad, Android tablets and foldable phones, and add an Apple Watch or Wear OS companion when it genuinely helps.

More from ShroyTech

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