App Design & Development · Mumbai
Mobile app development in Mumbai, built to last.
We design and build Android, iOS, cross-platform and web apps for startups, growing businesses and enterprises. Strategy, UI/UX, development, launch and support from one in-house team in Andheri East, so nothing gets lost between the designer, the developer and the person paying for it.
What is app design and development?
App design and development is the process of planning, designing, building, testing and launching a software application for mobile devices or the web. It includes product strategy, user research, UI/UX design, front-end and back-end development, API integrations, quality testing, App Store and Google Play submission, and ongoing maintenance after launch.
What does ABC Designs’ app development service include?
ABC Designs, a digital agency in Andheri East, Mumbai founded in 2012, provides mobile app UI/UX design, Android, iOS and Flutter cross-platform development, web app development, backend and API integration, store launch and app maintenance. Every project starts with a discovery phase and a clickable prototype, then moves to two-week build sprints with a demo at the end of each.
01 — Diagnosis
Why do app projects go over budget, or fail after launch?
When businesses come to us to rescue or rebuild an app, the trouble almost always started with one of six problems. Most can be prevented in the first two weeks of a project.
Unclear scope
What happens: features get added mid-build, timelines slip and the budget runs out before launch.
How we prevent it: A paid discovery phase that fixes version-one features, user flows and acceptance criteria in writing.
Design skipped or rushed
What happens: an app that works but confuses users, with poor reviews and people who never open it twice.
How we prevent it: User research, wireframes and a clickable prototype tested with real users before development starts.
Wrong technology choice
What happens: paying for two native apps you didn’t need, or a framework that can’t do what you need later.
How we prevent it: Platform recommendation (native, Flutter or web) based on your features, users and budget, explained in writing.
No plan for scale
What happens: the app slows down or crashes as users grow; the backend can’t handle new features.
How we prevent it: Scalable backend architecture, cloud hosting on AWS or Firebase, and load testing before launch.
Weak testing
What happens: bugs on certain phones, rejected store submissions and a flood of one-star reviews.
How we prevent it: Manual and automated testing on real Android and iOS devices, plus a store-readiness checklist.
No life after launch
What happens: the app breaks after an OS update, nobody tracks usage and the original developer is gone.
How we prevent it: Analytics from day one, documented code, and a maintenance plan for updates and fixes.
02 — What’s included
Our app design and development services
Ten services that cover the full life of an app. Hire us for the whole journey or for one stage, such as design only, a rebuild, or taking over maintenance of an app someone else built.
App strategy & discovery
01Turn an idea into a clear, buildable plan before money goes into code.
- Goals, users and competitor review
- Feature list and version-one scope
- Platform and tech recommendation
You get: Product brief + estimate
Mobile app UI/UX design
02Interfaces that feel natural on each platform and guide users to the action that matters.
- User flows and wireframes
- Visual design and design system
- Clickable prototype for testing
You get: Approved prototype ready to build
Mobile app UI/UX design →Android app development
03Native Android apps in Kotlin, built for the range of devices your users actually own.
- Kotlin and Android Studio
- Material Design guidelines
- Google Play launch
You get: Live app on Google Play
Android app development →iOS app development
04Native iPhone and iPad apps in Swift that meet Apple’s design and review standards.
- Swift and Apple frameworks
- Human Interface Guidelines
- App Store submission
You get: Live app on the App Store
iOS app development →Cross-platform apps (Flutter)
05One codebase for Android and iOS: faster to build, simpler to maintain.
- Flutter with shared business logic
- Platform-specific touches where needed
- Single release pipeline
You get: Android + iOS apps from one codebase
Web app development
06Browser-based apps, portals and dashboards that work on any device without a download.
- React.js and Next.js front ends
- Progressive web app (PWA) options
- Role-based access and admin panels
You get: Production web application
Web app development →Backend, APIs & integrations
07The servers, databases and connections that make your app work behind the screen.
- Node.js / Express.js and Firebase
- REST APIs and admin dashboards
- Payments, CRM, ERP and maps
You get: Secure, documented backend
API development & integration →Testing & quality assurance
08Catch problems before your users do.
- Real-device testing, Android and iOS
- Performance and security checks
- Store-readiness review
You get: Test report with every release
App launch & store optimisation
09Get approved first time and give your app a strong start in the stores.
- Store listing copy and screenshots
- App Store Optimisation (ASO) basics
- Analytics and crash reporting set-up
You get: Approved, tracked launch
App maintenance & support
10Keep your app secure, compatible and improving after launch, including apps built by other teams.
- OS and device compatibility updates
- Bug fixes and monitoring
- Feature enhancements
You get: Monthly support with agreed response times
App maintenance & support →03 — Choosing your platform
Native, cross-platform or web app: which should you build?
For most businesses launching a first app, cross-platform (Flutter) gives the best balance of cost, speed and quality. Native is worth it when the app depends on heavy device features or peak performance; a web app suits internal tools and dashboards.
| Native (Kotlin / Swift) | Cross-platform (Flutter) | Web app / PWA (React, Next.js) | |
|---|---|---|---|
| What it is | Separate apps written in each platform’s own language | One codebase that compiles to Android and iOS apps | An application that runs in the browser, optionally installable |
| Best for | Camera, Bluetooth, AR, wearables, high-performance or graphics-heavy apps | Most consumer, e-commerce, booking and business apps | Dashboards, portals, SaaS products and internal tools |
| Relative cost | Highest: two codebases to build and maintain | Lower: one codebase, one team | Lowest to start; no store fees or approvals |
| Time to market | Longest | Faster | Fastest |
| App Store & Play Store | Yes | Yes | No (installable from the browser) |
| Performance & feel | Best possible | Near-native for most use cases | Good; depends on browser and connection |
Not sure? We recommend the platform during discovery, based on your users, features and budget, and explain the trade-offs in writing. Read more about Android, iOS and web app development.
04 — Our process
How we design and build your app, in six stages
Each stage ends with something you can see, test and sign off, so you never pay for weeks of work you haven’t reviewed.
-
Stage 1 · Weeks 1–2
Discover
- Workshop: goals, users, competitors
- Feature list and version-one scope
- Platform and architecture choice
Deliverable: Product brief + fixed-scope estimate
-
Stage 2 · Weeks 2–5
Design
- User flows and wireframes
- Visual design and design system
- Clickable prototype, tested with users
Deliverable: Approved prototype
-
Stage 3 · Two-week sprints
Build
- Front end and backend development
- API and third-party integrations
- Demo at the end of every sprint
Deliverable: Working builds you can install
-
Stage 4 · Throughout
Test
- Real-device testing, Android and iOS
- Performance and security checks
- User acceptance testing with you
Deliverable: Release-ready build + test report
-
Stage 5 · Launch week
Launch
- App Store and Google Play submission
- Store listing and screenshots
- Analytics and crash reporting live
Deliverable: Live app + full code handover
-
Stage 6 · Ongoing
Grow & support
- Monitor usage, crashes and reviews
- OS updates and bug fixes
- Plan and ship the next features
Deliverable: Monthly report + roadmap call
05 — Timelines
How long does it take to develop an app?
A simple app typically takes 6–8 weeks; a mid-sized app 10–16 weeks; a complex app with a custom backend 4–6 months or more. Scope, number of platforms, integrations and how quickly feedback comes back set the pace.
Simple app or MVP. A focused first version: a handful of core screens, login, basic backend, one platform or Flutter for both.
Mid-complexity app. User accounts, payments, notifications, an admin panel and a few third-party integrations.
Complex app. Custom backend, real-time features, multiple user roles, enterprise integrations or heavy device features.
Typical ranges from our projects, not a guarantee. App Store and Google Play review times are extra. Bars are illustrative.
06 — Quality & reporting
How we measure a successful app
A finished build is not the goal; an app people open again is. After launch you get a dashboard tracking these numbers, agreed with you during discovery.
| Metric | Why it matters | Source |
|---|---|---|
| Crash-free users | The share of users who never hit a crash: the clearest sign of a stable app. | Firebase Crashlytics |
| Retention (day 1, 7, 30) | Whether people come back. An app nobody reopens has failed, however well it was built. | Firebase / GA4 |
| Activation rate | How many new users complete the key action: sign-up, first order, first booking. | GA4 events |
| Store rating & reviews | Drives downloads and tells you what users love or hate. | App Store Connect / Play Console |
| App start time & screen load | Slow apps get closed and uninstalled. | Firebase Performance |
| API response time & uptime | The backend has to keep up as users grow. | Server monitoring |
| Release cadence | How often fixes and improvements actually reach users. | Release log |
07 — Apps by business type
What we prioritise depends on who will use your app
Startups & MVPs
You need to prove the idea with real users before raising or spending more.
FOCUS · Lean scope, Flutter, fast launch, analytics
E-commerce & D2C brands
Repeat buyers shop more in an app than on a mobile site.
FOCUS · Catalogue, cart, payments, push offers
Healthcare & wellness
Bookings, reminders and records, where privacy and trust come first.
FOCUS · Appointment flows, data security, consent
Education & coaching
Students expect lessons, tests and schedules on their phone.
FOCUS · Video, progress tracking, parent access
Real estate
Buyers browse projects and book site visits on mobile.
FOCUS · Listings, maps, enquiry and CRM sync
Enterprise & B2B
Field teams, dealers and staff need tools that fit how they work.
FOCUS · Role-based access, ERP/CRM integration, offline mode
08 — Our standards
How we work: what we always do, and what we never do
An app is a long-term asset. We build to Apple’s App Store Review Guidelines, Google Play policies and the OWASP mobile security standard, so it passes review and stays maintainable.
We always
- Get your sign-off on the design prototype before writing code
- Hand over the full source code, store accounts and credentials in your name
- Demo working software at the end of every sprint
- Test on real Android and iOS devices before every release
- Document the code and architecture so any team can maintain it
We never
- Hold your code or accounts hostage to lock you in
- Quote a fixed price before the scope is clear
- Ship untested builds to your users
- Collect user data your app doesn’t need
- Hand your project to an outside team without telling you
09 — Pricing
How much does app development cost in Mumbai?
App development cost depends on the number of features, the platforms you need, the design complexity and the integrations involved. Most clients start with a free consultation, then a short discovery phase that produces a clickable prototype and a fixed-scope quote.
Discovery & prototype
A clear plan and a clickable prototype you can test, pitch to investors or take to any developer.
- Discovery workshop
- Feature scope and user flows
- UI/UX design + clickable prototype
- Fixed-scope build estimate
App build (v1)
Design, development, testing and launch of your first version.
- Everything in discovery
- Android, iOS or Flutter build
- Backend, admin panel and integrations
- Store launch + full code handover
Maintenance & growth
Keep the app healthy and keep improving it after launch.
- OS and device updates
- Bug fixes and monitoring
- Monthly feature hours
- Usage report + roadmap call
What changes the price: number of screens and features · Android, iOS or both · custom vs template design · backend and admin panel · third-party integrations (payments, CRM, maps) · security and compliance needs.
10 — Technology
The technologies we build with
Proven, widely used frameworks, so your app is easy to hire for, maintain and scale long after launch.
11 — FAQ
App development: frequently asked questions
Have a question about your own idea? Book a free consultation and we’ll answer it for your project specifically.
What is app design and development?
App design and development is the full process of creating a mobile or web application: strategy, user research, UI/UX design, coding, testing, publishing to the App Store and Google Play, and maintaining the app after launch.
How much does it cost to develop an app in Mumbai?
App development cost depends on the number of features and screens, the platforms (Android, iOS or both), design complexity, backend needs and integrations. ABC Designs gives a fixed-scope estimate after a short discovery phase; book a free consultation for a ballpark range.
How long does it take to develop a mobile app?
A simple app or MVP typically takes 6–8 weeks. A mid-complexity app takes around 10–16 weeks, and complex apps with custom backends take 4–6 months or more. App Store and Google Play review adds a few days.
Should I build for Android, iOS or both?
Most Indian businesses need Android first, because it has the larger share of users in India, and iOS if their customers skew premium or international. A cross-platform Flutter app lets you launch on both from one codebase.
Native or Flutter: which is better for my app?
Flutter suits most business and consumer apps because one codebase cuts cost and time. Native Kotlin or Swift is better when the app relies on heavy device features, complex animations or peak performance. We recommend one during discovery.
Will I own the source code and the app?
Yes. At handover you receive the full source code, documentation, and the App Store and Google Play accounts in your company’s name. [Confirm with contract terms.]
Can you redesign or improve an existing app?
Yes. We audit the current app’s code, design and reviews, then recommend whether to improve it in place or rebuild. We also take over apps built by other developers.
Do you build web apps as well as mobile apps?
Yes. We build web applications, customer portals, dashboards and progressive web apps using React.js, Next.js and Node.js, often alongside a mobile app that shares the same backend.
Will you publish my app on the App Store and Google Play?
Yes. We prepare the store listing, screenshots and privacy details, handle submission and respond to review feedback until the app is approved.
How do you keep my app and user data secure?
We follow the OWASP Mobile Application Security Verification Standard: encrypted data in transit and at rest, secure authentication, least-privilege APIs and security testing before release. We only collect data the app needs.
Do you provide maintenance after launch?
Yes. Our monthly maintenance plans cover OS and device compatibility updates, bug fixes, monitoring, security patches and feature improvements, with agreed response times.
Can my app connect to my CRM, ERP or payment gateway?
Yes. We integrate apps with payment gateways such as Razorpay, CRMs, ERPs, maps, SMS and WhatsApp services, and custom systems through REST APIs.
Will you sign an NDA before I share my idea?
Yes. We can sign a mutual NDA before the first detailed conversation about your idea.
Do you work with clients outside Mumbai?
Yes. Our team is based in Andheri East, Mumbai, and we build apps for businesses across India and internationally, with regular video calls and sprint demos.
12 — Glossary
App development terms, explained simply
- MVP
- Minimum viable product: the smallest version of an app that delivers real value, built to test an idea with users before investing further.
- Native app
- An app written in a platform’s own language (Kotlin for Android, Swift for iOS) for the best performance and device access.
- Cross-platform app
- One codebase that runs on both Android and iOS, built with a framework such as Flutter.
- Flutter
- Google’s open-source framework for building Android, iOS and web apps from a single codebase.
- Progressive web app (PWA)
- A web app that can be installed on a phone’s home screen and work offline, without an app store.
- API
- Application programming interface: the connection that lets your app exchange data with servers, payment gateways, CRMs and other systems.
- ASO
- App Store Optimisation: improving an app’s title, description, screenshots and ratings so it ranks and converts better in app stores.
- UI vs UX
- UI (user interface) is how the app looks; UX (user experience) is how easy and pleasant it is to use.