App Development — Sirus Infotech
App Development Studio

BUILD
APPS
THAT SHIP

iOS, Android, React Native, Flutter — we design and develop high-performance mobile and web applications that users love, from MVP to enterprise scale.

Native iOS and Android development
Cross-platform React Native and Flutter
App Store and Play Store submission
Backend APIs, Firebase, AWS
Post-launch support and app maintenance
180+Apps Delivered
4.8★Avg App Rating
3M+End Users
2.4K USERS 98% UPTIME 4.9★ RATING
3M+Users Served
4.8 ★Avg Store Rating
iOS Development ◆Android Development ◆React Native ◆Flutter ◆Swift / SwiftUI ◆Kotlin ◆Firebase ◆REST APIs ◆App Store ◆Play Store ◆UI/UX Design ◆Push Notifications ◆ iOS Development ◆Android Development ◆React Native ◆Flutter ◆Swift / SwiftUI ◆Kotlin ◆Firebase ◆REST APIs ◆App Store ◆Play Store ◆UI/UX Design ◆Push Notifications ◆
What We Build

App Development Services

01
iOS App Development

Native iPhone and iPad apps built with Swift and SwiftUI. Pixel-perfect design following Apple Human Interface Guidelines, optimised for every iPhone model and App Store approval.

SwiftSwiftUIXcodeCore Data
02
Android App Development

Native Android apps using Kotlin and Jetpack Compose for modern, high-performance experiences. Optimised for the full Android device ecosystem and Google Play Store launch.

KotlinJetpackAndroid StudioRoom DB
03
React Native Apps

One codebase, two platforms — iOS and Android simultaneously. Ideal for startups and MVPs. Near-native performance with 60–80% cost savings over building two separate native apps.

React NativeExpoTypeScriptRedux
04
Flutter Development

Google's Flutter framework for beautiful, expressive UIs across iOS, Android, and web from a single Dart codebase. Exceptional performance and custom animations out of the box.

FlutterDartFirebaseBLoC/Riverpod
05
Backend and API Development

Scalable backend systems to power your app — REST APIs, real-time databases, user authentication, payment integration, push notifications, and cloud infrastructure on AWS or Firebase.

Node.jsFirebaseAWSPostgreSQL
06
App Redesign and Maintenance

Modernise your existing app with a fresh UI/UX, fix performance bottlenecks, update deprecated libraries, and keep your app compatible with the latest iOS and Android OS versions.

UI RedesignPerformanceOS UpdatesBug Fixes
Why Choose Us

Code. Design.
Ship. Scale.

Building a great app requires more than coding. It demands product thinking, stunning UI, robust architecture, and a team that has shipped real apps to real users. Our team has delivered 180+ apps across 12+ categories — from fintech to food delivery, e-commerce to enterprise tools.

01
App Store Expertise
We handle the entire App Store and Play Store submission process, including ASO metadata and review compliance.
02
Product-First Thinking
We ask why before we build. Our product strategists help you validate your idea and prioritise the right features for your MVP.
03
Scalable Architecture
Apps built to handle 100 users today and 1 million tomorrow. No costly rewrites as your user base grows.
04
Post-Launch Support
Crash monitoring, OS update compatibility, user feedback integration, and feature upgrades — we stay with you after launch.
★★★★★ 4.9 USERS 3M+ APPS 180+ UPTIME 99.9%
Technologies We Use

Every Platform Covered

We advise the best platform for your budget, timeline, and target audience.

iOS (Native)
Swift / SwiftUI

Best-in-class performance and design for iPhone and iPad. Ideal for premium consumer apps targeting Apple users.

Android (Native)
Kotlin / Jetpack Compose

Powerful native Android apps for the widest device range. Optimised for all screen sizes and Android versions from 8.0+.

React Native
iOS + Android (Cross-Platform)

Write once, run everywhere. Perfect for startups and MVPs that need both platforms without doubling the budget or timeline.

Flutter
iOS + Android + Web

Google's UI toolkit for building natively compiled apps from a single codebase. Stunning custom animations and pixel-perfect design.

How We Build

From Idea to App Store

01
Discovery
Product Strategy and Scoping

We analyse your idea, define the feature set, user flows, and tech architecture. You get a detailed project plan with timeline, milestones, and a fixed-price quote — before a single line of code is written.

02
Design
UI/UX Design and Prototyping

Our designers craft every screen in Figma — wireframes, high-fidelity mockups, interactive prototypes. You see exactly how your app will look and feel before development begins. Full revision rounds included.

03
Development
Frontend + Backend Engineering

Agile sprints with weekly demos. App development runs parallel to API/backend work. Clean architecture, version-controlled code on GitHub, and weekly builds for your review throughout the sprint.

04
QA Testing
Testing Across Devices and OS Versions

Rigorous manual and automated QA across 20+ real devices. Performance testing, security testing, edge case coverage, and crash-free verification before any build reaches the stores.

05
Launch
App Store and Play Store Submission

We handle the complete store submission — screenshots, descriptions, ASO metadata, privacy policy, content rating, and review compliance. We resolve any reviewer rejections until your app is live.

06
Post-Launch
Monitoring, Updates, and Growth

Crash analytics, user feedback monitoring, OS compatibility updates, and feature iterations based on real user data. Your app is never left alone after it goes live.

Investment

Transparent Pricing

All plans include UI/UX design, development, testing, and store submission.

Starter
MVP App
Validate your idea fast — one platform
49,999
// single platform · 4–6 weeks
  • iOS or Android (your choice)
  • Up to 8 core screens
  • UI/UX design in Figma
  • User auth + basic API
  • Store submission handled
  • 1 month post-launch support
Most Popular
Professional
Full Product
Cross-platform — iOS and Android
99,999
// both platforms · 8–12 weeks
  • React Native or Flutter (both stores)
  • Unlimited screens and flows
  • Custom backend + REST APIs
  • Payment gateway integration
  • Push notifications
  • Admin dashboard included
  • 3 months support and AMC
Enterprise
Custom Platform
Complex apps, high scale, custom needs
1.99L +
// custom scope · 12–20 weeks
  • Native iOS + Android (separate)
  • Microservices architecture
  • Real-time features (WebSockets)
  • AI/ML integrations
  • Load-tested for 1M+ users
  • Dedicated development team
Start Your Project

Let's Build
Your App.

Tell us about your idea. Our team will review your requirements, suggest the right platform and stack, and get back to you with a detailed proposal within 24 hours.

Free product consultation and scoping
Detailed project proposal in 24 hours
Fixed price — no hidden charges
NDA available on request
Full source code ownership transferred
Free Consultation
Start Your App Project

Our team responds within 4 hours on business days.

// BRIEF RECEIVED — EXPECT OUR RESPONSE WITHIN 4 HOURS
Error. Please try again.

// your idea is safe — nda available on request

Client Stories

180+ Apps. Real Results.

We launched our food delivery app in 10 weeks. The app is live on both stores with 4.7 rating and 12,000 active users in the first 3 months. The team understood our domain deeply and the code quality is exceptional.

SK
Suraj Kulkarni
// Founder, QuickBite Food App

Our fitness tracking app on React Native handles real-time workout data from wearables flawlessly. Sirus Infotech built us a complete ecosystem — mobile app, backend API, and web dashboard — all integrated perfectly.

NA
Neha Arora
// CEO, FitPulse Health

We had a terrible first version of our app from another agency. LegalSuite rebuilt it from scratch in Flutter with proper architecture. Performance improved 10x, crashes dropped to zero, and our users love the new UI.

RV
Rajan Verma
// CTO, LoanConnect Fintech
FAQ

Your Questions Answered

Should I build native or cross-platform? +
For most startups and businesses, React Native or Flutter is the smart choice — same quality, half the cost. We recommend native (Swift/Kotlin) only for apps with heavy hardware usage like AR/VR, complex animations, or very high-performance requirements. We advise the right choice for free during consultation.
How long does it take to build an app? +
An MVP takes 4–6 weeks for a single platform. A full cross-platform app typically takes 8–12 weeks. Complex enterprise apps with custom backends take 12–20 weeks. We provide a detailed milestone timeline at the start of every project and stick to it.
Do you handle App Store and Play Store submission? +
Yes — completely. We handle the entire submission process including app screenshots, descriptions, ASO metadata, privacy policy, content rating configuration, and Apple/Google review compliance. If the app gets rejected, we resolve all reviewer feedback and resubmit at no extra charge.
Who owns the source code after the project? +
You do — 100%. Upon final payment, full source code is transferred to your GitHub repository. You have complete ownership of all code, assets, and documentation. No lock-in, no licensing fees, no dependency on us to run your own product.
Can you add features to my existing app? +
Absolutely. We take on existing apps for feature additions, performance improvements, UI redesigns, and platform migrations. We'll audit your current codebase first and give you an honest assessment of its quality before committing to the work.
What happens after the app is launched? +
All plans include post-launch support (1–3 months). We offer monthly AMC plans for ongoing maintenance — iOS/Android OS update compatibility, bug fixes, analytics monitoring, and iterative feature releases based on user feedback and app store reviews.