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
- 1
Design the flow
Week 1Every screen drawn and tapped through as a prototype
Figma · prototype · user flow
- 2
Build once
Weeks 2–7One codebase becomes the iPhone and Android apps
Flutter or React Native · API
- 3
Test on real phones
Weeks 7–8Real devices, real networks, before anyone else sees it
TestFlight · Play testing · automated tests
- 4
Publish & grow
LaunchLive 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.
- 01
The screens
InterfaceEverything 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
- 02
The brain
App logic & serverThe 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
- 03
The phone's powers
Device featuresEverything 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
- 04
The stores
Release & updatesHow 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
TrendingThe language behind Flutter. Easy to read, fast to run, and one codebase reaches iPhone, Android and more.
- Use it for
- Flutter apps
TypeScript
TrendingJavaScript 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 standardGoogle'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 standardApple'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
SteadyThe older Android language, still found in many existing apps and in large company back ends.
- Use it for
- Maintaining existing Android code
C# (.NET)
SteadyMicrosoft'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
TrendingGoogle'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
TrendingBuilds 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 standardNative 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 standardNative 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
TrendingShare 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
SteadyWrap 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
SteadyMicrosoft's cross-platform toolkit for iPhone, Android, Windows and Mac in C#.
- Use it for
- .NET teams building for several systems
Progressive web apps
SteadyA 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 standardGoogle'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
TrendingA 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 standardA 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 standardThe 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 standardWebSockets and live databases push updates instantly: messages, order status, live locations.
- Use it for
- Chat, live maps and shared screens
Cloud storage & CDN
Industry standardPhotos, videos and files stored cheaply and delivered quickly from a location near each user.
- Use it for
- Uploads, media and downloads
Serverless functions
TrendingSmall 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 standardA 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 standardMessages 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
TrendingSign 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 standardTake 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 standardShow 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 standardThe 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 standardSell 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
SteadyConnect to nearby devices, tap to pay or tag, and read data from watches and sensors.
- Use it for
- Hardware companions and health apps
Deep links & sharing
Industry standardLinks that open the right screen inside the app, and easy sharing to other apps.
- Use it for
- Marketing campaigns and referrals
Widgets & live activities
TrendingGlanceable 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 standardBoth 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 standardPrivate 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 standardFastlane, Expo's EAS, Codemagic and GitHub Actions build, test and upload every version automatically.
- Use it for
- Calm, repeatable releases
Over-the-air updates
TrendingSend 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 standardFirebase 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 standardFirebase, PostHog or Mixpanel show which screens people use and where they drop off.
- Use it for
- Deciding what to improve next
Automated testing
TrendingTools 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 standardApple'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
TrendingA 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
TrendingPoint 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
TrendingSmall 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 standardSpeech-to-text and text-to-speech for hands-free use and for accessibility.
- Use it for
- Dictation, voice notes and assistants
Payments
Industry standardStripe, Razorpay, Apple Pay, Google Pay and UPI for quick, safe checkout.
- Use it for
- Shops, bookings and subscriptions
Languages & accessibility
Industry standardSeveral 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
SteadyScreens 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 watchingA 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 "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 →01Discover
1–3 daysA call about your goals, audience and scope. You get a fixed price and timeline before any commitment.
- Discovery call
- Scope document
- Fixed quote
02Story & Design
1–2 weeksWe map the story your product tells, then design every screen and turn it into a clickable prototype.
- Story map
- Wireframes
- UI design
- Prototype
03Build
2–6 weeksClean, fast engineering with a live demo every week, so you see progress instead of waiting for it.
- Weekly demos
- Staging link
- Clean code
04Test
~1 weekReal devices, real browsers. We test speed, security and every flow, and automate the tests.
- Device testing
- Speed audit
- Automated tests
05Launch & Grow
OngoingWe 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 [email protected] 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
Building something else?
Most products need more than one of these. We build them together, with one team and one plan.
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