Mumbai · Mobile App Development
Mobile App Development Company in Mumbai
4Byte is a Mumbai-based mobile app development company building custom iOS, Android, and cross-platform apps for startups and growing businesses.
We're a new studio built by engineers who aren't new. Our founders spent over five years building apps and software products before starting 4Byte — so you get experienced engineers working on your app directly, without the layers of account managers and junior developers that come with a large agency.
That means one team from idea to App Store, weekly progress you can actually see, and an app built to launch and last — not a template rushed out the door.
Building apps for businesses across Mumbai, Navi Mumbai and Thane — and clients in the USA, UAE, Saudi Arabia and the UK.
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Trusted by businesses in Mumbai and beyond.
Trusted by teams building the future
Why mobile
Why Your Mumbai Business Needs a Mobile App
Your customers live on their phones. In a market as fast and competitive as Mumbai, an app isn't a vanity project — it's the difference between being a tab someone forgets and an icon on their home screen.
The catch: a badly built app does the opposite. It crashes, drains battery, sits unopened, and quietly damages trust. Which is exactly why how it's built matters as much as whether you build it.
What we build
Mobile App Development Services in Mumbai
We cover the full journey — from a rough idea to a live, maintained app — and pick the right approach for each project instead of pushing everyone down the same path.
Native iPhone and iPad apps built to Apple's standards, fast and smooth, ready for the App Store.
For iPhone & premium productsNative Android apps built to perform across the huge range of devices real Indian users carry.
For the widest reach in IndiaOne codebase, both platforms — using React Native or Flutter to launch on iOS and Android together.
For faster, affordable launchesA focused first version with only the features needed to launch, get real users, and learn.
For validating an ideaInternal and customer-facing apps built around how your business actually works.
For processes off-the-shelf can't handleShopping, ordering, and delivery apps with payments, tracking, and smooth checkout.
D2C, retail, restaurants, deliveryA rebuild for an app that's slow, dated, crashing, or expensive to change.
For apps holding you backUpdates, OS compatibility, monitoring, and improvements after launch.
For apps that shouldn't be left to rotThe tech decision
iOS, Android, or Cross-Platform — What Should You Build?
This is the first real decision, and the wrong answer wastes money. Here's the honest version, without the sales spin.
| Native (iOS / Android) | Cross-Platform (RN / Flutter) | |
|---|---|---|
| What it is | A separate app built for each platform | One codebase that runs on both |
| Speed to launch | Slower — two builds | Faster — one build, both stores |
| Cost | Higher | Lower for most projects |
| Performance | Maximum, for heavy or complex apps | Excellent for the vast majority of apps |
| Best for | Games, AR, heavy graphics, platform-specific features | Most business, e-commerce, and startup apps |
The honest default: for most Mumbai businesses and startups, cross-platform is the smarter choice — you reach everyone, launch faster, and spend less, with performance that's more than enough for what most apps actually do. We recommend native only when your app genuinely needs it, and we'll tell you plainly which camp you're in during the free consultation.
Types of apps
The Types of Apps We Build
Different apps solve different problems. These are the ones Mumbai businesses ask us for most.
The app your customers download, browse, and buy through.
Ordering, real-time tracking, and delivery, done properly.
Two-sided platforms connecting buyers and sellers, or users and providers.
Payments, lending, and finance apps built to the standards money demands.
Appointments, records, and telemedicine with privacy at the core.
Mobile storefronts built for speed and conversion.
Appointments, scheduling, and service discovery.
Tools that make your own team faster.
Courses, live classes, and progress tracking.
Feeds, profiles, and real-time interaction.
Capabilities
Features We Build Into Apps
Standard building blocks we've shipped before — so they arrive proven, not experimental.
Email, phone OTP, social, and biometric sign-in.
UPI, cards, and wallets via trusted gateways.
The feature that brings users back, done without being annoying.
Live tracking, chat, and updates that feel instant.
GPS, geofencing, and location-aware experiences.
Photo, video, scanning, and uploads.
Apps that keep working when the network doesn't.
Help without leaving the app.
The web panel you use to run the app.
See what users actually do, not what you assume.
Recommendations, assistants, and automation where they genuinely help.
CRMs, ERPs, and the tools you already use.
How it works
Our App Development Process
Building an app is a long game, so we build it in stages that each produce something real. You're never months in wondering what's happening.
Launch
App Store & Play Store Launch — Handled for You
Getting an app approved is where many first-time launches stall. Apple and Google both reject apps for reasons that aren't obvious until you've done it before. We handle the whole submission process: developer accounts, store listings, screenshots, privacy declarations, and the back-and-forth of the review process. You end up with a live, published app — not a build stuck in review limbo.
Technology
Technologies We Build With
You don't need to know these tools — here's what each one means for your app.
React Native & Flutter. One codebase for iOS and Android, which means a faster launch and a lower cost — without your app feeling like a compromise.
Swift & Kotlin. Maximum performance and full access to everything a phone can do, for apps that genuinely need it.
Node.js, Python, PostgreSQL & Supabase. The engine behind the app — accounts, data, and business logic — built to stay fast as your user base grows.
Razorpay, Stripe & UPI. Reliable, secure payments your Indian customers already trust and know how to use.
AWS, Google Cloud & Firebase. Infrastructure that scales when your app takes off, so a good week isn't a technical crisis.
OpenAI & on-device AI. Recommendations, assistants, and automation built into the app where they add real value.
Industries
Industries We Build Apps For in Mumbai
Mumbai's business mix is unlike anywhere else in India, and the apps it needs reflect that.
Shopping apps built for speed and repeat purchases.
Ordering, kitchen, and delivery apps with live tracking.
Secure apps for payments, lending, and money management, for firms across BKC and beyond.
Appointments, telemedicine, and fitness apps.
Property discovery, listings, and lead capture.
Fleet, dispatch, and tracking apps for Mumbai's movement of goods.
Live classes, learning, and student apps.
Content, streaming, and community apps.
Booking and service-provider apps.
Mobile products for Mumbai's growing tech ecosystem.
Where we work
Areas We Serve Across Mumbai
We work with businesses across the city and the wider metropolitan region.
Most projects run smoothly over weekly video calls and a shared test build, but we're based here — so if you'd rather meet in person to plan your app, that's easy to arrange.
Investment
App Development Cost in Mumbai
The honest answer is that it depends on scope — but "it depends" doesn't help you plan a budget, so here's how app pricing generally works in the Mumbai market.
What changes the price: the number of features, whether you need one platform or both, native versus cross-platform, the complexity of the design, integrations like payments and maps, and whether there's a backend and admin panel to build.
| Type of app | Typical range |
|---|---|
| Simple app (MVP, few features) | Get a fixed quote — to be added |
| Mid-complexity business app | Get a fixed quote — to be added |
| E-commerce / on-demand app | Get a fixed quote — to be added |
| Complex / enterprise app | Get a fixed quote — to be added |
A word of caution on very cheap quotes. An app quoted far below the market is usually a rushed cross-platform template with no proper testing — the kind that crashes on older phones, gets rejected by the App Store, and needs rebuilding within a year. With apps, the cheapest quote is almost never the cheapest outcome.
What we do instead: after a free consultation, you get a fixed, written estimate with the full scope defined — no hourly surprises, no scope creep, no hidden costs later.
Choosing wisely
How to Choose an App Development Company in Mumbai
Mumbai has hundreds of app development companies, from solo freelancers to large firms. Here's what actually separates a good one from an expensive mistake.
Our work
Our Work
ExcelAI — a mobile-first AI data platform
Funnell.ai — an AI product, launched in 4 weeks
The team
The People Who'll Build Your App
When you work with 4Byte, you work directly with the founders — no account managers, and no juniors on your budget.
Abdun Noor Faruki Biswas
Abdun leads product strategy and client relationships. He has spent over five years building apps, SaaS products and AI systems, and keeps every project tied to a real business outcome rather than a feature list.
LinkedIn →
Imran Shaikh
Imran drives the technical architecture and engineering standards. With five-plus years shipping production applications, he makes sure every app we deliver is fast, stable, and built on a codebase that can grow.
LinkedIn →Why 4Byte
Why Businesses in Mumbai Choose 4Byte
Our founders have been building apps and software for over five years. The studio is new; the people building your app are not.
Not a salesperson, not an account manager.
Design, development, testing, and launch under one roof.
Built for your business and tested on real devices.
Full scope agreed upfront, with no hidden costs.
Code, store accounts, and design files. No lock-in.
Based in Mumbai, building for clients across India and internationally.
▸ Social Proof
Don't take our word
— hear it from them.
Real clients. Real results. Verified reviews from founders, CTOs and operators who shipped with us.
“They did an amazing job and built exactly what I was looking for. It's not often you find someone that fully understands your vision, but he did everything I was hoping for.”
Basir
Founder · Asamaha
“Great experience. Clear communication, stay on task, and deliver exactly what's asked without wasting time. If you need someone dependable who can follow instructions, implement feedback, and get the work done without drama, they're a good fit.”
Britton
Founder · TrackTech
“Needed a website up and running within 24 hours for a presentation, and it was delivered in less than 12 hours. Excellent experience and would happily work with Abdun again.”
Van
Founder · Saveero
“Working with Abdun has been an absolute dream. He implemented the updates to our Insights page with precision and care, mirroring the wireframe I provided perfectly — down to the smallest details.”
Vanessa
Founder · Jourlev
“They did an amazing job and built exactly what I was looking for. It's not often you find someone that fully understands your vision, but he did everything I was hoping for.”
Basir
Founder · Asamaha
“Great experience. Clear communication, stay on task, and deliver exactly what's asked without wasting time. If you need someone dependable who can follow instructions, implement feedback, and get the work done without drama, they're a good fit.”
Britton
Founder · TrackTech
“Needed a website up and running within 24 hours for a presentation, and it was delivered in less than 12 hours. Excellent experience and would happily work with Abdun again.”
Van
Founder · Saveero
“Working with Abdun has been an absolute dream. He implemented the updates to our Insights page with precision and care, mirroring the wireframe I provided perfectly — down to the smallest details.”
Vanessa
Founder · Jourlev
How Funnell.ai went from an idea to a live AI analytics platform in 4 weeks.
Asif
Founder · Funnell.ai
“Working with Abdun has been an absolute dream. He implemented the updates to our Insights page with precision and care, mirroring the wireframe I provided perfectly — down to the smallest details.”
Vanessa
Founder · Jourlev
“Needed a website up and running within 24 hours for a presentation, and it was delivered in less than 12 hours. Excellent experience and would happily work with Abdun again.”
Van
Founder · Saveero
“Great experience. Clear communication, stay on task, and deliver exactly what's asked without wasting time. If you need someone dependable who can follow instructions, implement feedback, and get the work done without drama, they're a good fit.”
Britton
Founder · TrackTech
“They did an amazing job and built exactly what I was looking for. It's not often you find someone that fully understands your vision, but he did everything I was hoping for.”
Basir
Founder · Asamaha
“Working with Abdun has been an absolute dream. He implemented the updates to our Insights page with precision and care, mirroring the wireframe I provided perfectly — down to the smallest details.”
Vanessa
Founder · Jourlev
“Needed a website up and running within 24 hours for a presentation, and it was delivered in less than 12 hours. Excellent experience and would happily work with Abdun again.”
Van
Founder · Saveero
“Great experience. Clear communication, stay on task, and deliver exactly what's asked without wasting time. If you need someone dependable who can follow instructions, implement feedback, and get the work done without drama, they're a good fit.”
Britton
Founder · TrackTech
“They did an amazing job and built exactly what I was looking for. It's not often you find someone that fully understands your vision, but he did everything I was hoping for.”
Basir
Founder · Asamaha
“They did an amazing job and built exactly what I was looking for. It's not often you find someone that fully understands your vision, but he did everything I was hoping for.”
Basir
Founder · Asamaha
“Great experience. Clear communication, stay on task, and deliver exactly what's asked without wasting time. If you need someone dependable who can follow instructions, implement feedback, and get the work done without drama, they're a good fit.”
Britton
Founder · TrackTech
“Needed a website up and running within 24 hours for a presentation, and it was delivered in less than 12 hours. Excellent experience and would happily work with Abdun again.”
Van
Founder · Saveero
“Working with Abdun has been an absolute dream. He implemented the updates to our Insights page with precision and care, mirroring the wireframe I provided perfectly — down to the smallest details.”
Vanessa
Founder · Jourlev
FAQ
Frequently Asked Questions
How much does mobile app development cost in Mumbai?+
It depends on scope. A simple MVP, a mid-complexity business app, and a full enterprise app are very different builds. Prices in Mumbai vary widely, and very cheap quotes usually mean a rushed template that needs rebuilding within a year. We give you a fixed, written estimate after a free consultation, with the full scope defined upfront.
How long does it take to build an app?+
A focused MVP typically takes around six to ten weeks. More complex apps with multiple features, integrations, or both platforms take longer. You get a firm timeline after the free consultation, and you can install a test build and see progress every week.
Should I build for iOS, Android, or both?+
It depends on your users and budget. If your customers are mostly on iPhone, or your product is premium, iOS-first can make sense. To reach the widest audience in India, Android matters. For most businesses, a cross-platform app covers both at once, faster and more affordably. We'll recommend the right path in the free consultation.
What's the difference between native and cross-platform apps?+
Native apps are built separately for each platform and offer maximum performance, which matters for games and graphics-heavy apps. Cross-platform apps share one codebase across iOS and Android, which is faster and cheaper to build and more than powerful enough for most business, e-commerce, and startup apps. We help you pick based on what your app actually needs.
Do you build both the app and the backend?+
Yes. Most apps need a backend — the server, database, and admin panel that powers accounts, data, and everything behind the scenes. We build the full product: the app your users see and the system that runs it.
Do you help launch the app on the App Store and Play Store?+
Yes. We handle the entire submission process — developer accounts, store listings, screenshots, privacy declarations, and the review back-and-forth — so your app actually gets approved and published, rather than stuck in review.
Do I own the app and the source code?+
Yes. You own your app, the complete source code, the design files, and the App Store and Play Store accounts. We build on standard technologies and hand everything over cleanly, so you're never locked in to us.
Will you maintain the app after launch?+
Yes. Apps need regular updates as iOS and Android release new versions, plus bug fixes and new features over time. We stay on to maintain and grow the app — and because we built it, changes are faster and lower-risk than bringing in a new team later.
Can you redesign or fix my existing app?+
Yes. We take on redesigns and rebuilds, including apps that are slow, crashing, or expensive to change. We start by understanding what's there and protecting what your users already rely on, rather than rewriting everything by reflex.
Can you add AI features to my app?+
Yes. We build AI into apps where it genuinely helps — recommendations, assistants, smart search, and automation. AI-powered products are core to what we do, so this is familiar territory rather than an experiment.
How long has 4Byte been around?+
4Byte was founded recently, but our founders are not new to this. They spent over five years building apps and software products independently before starting the studio, and have shipped 45+ products between them. We started 4Byte to work with clients directly rather than through layers of management — so you get experienced engineers without the overhead of a large agency.
Do you only work with clients in Mumbai?+
No. Mumbai is our base, and we work with clients across India — Navi Mumbai, Thane, Delhi, Bangalore, Hyderabad and Pune — as well as internationally in the USA, UAE, Saudi Arabia and the UK.
How do we get started?+
Book a free consultation, or send the form on this page. We'll talk through your app idea, then give you a clear plan, an honest timeline, and a fixed estimate — with no obligation.
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Ready?
Ready to Build Your App?
If your app is going to carry your business, it deserves to be built properly — designed with care, tested on real devices, and launched by people who've done it before.
Tell us your idea. We'll give you a straight answer on what it takes, how long it will take, and what it will cost — even if that answer is that you're not ready to build yet.
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