Flutter App Development Company for iOS, Android and Web
Brand-led apps that look and behave the same on every screen, designed and built by one senior team from first sketch to store approval.
A good fit if
- Your app design is custom and has to look identical on every phone
- You want iOS, Android and possibly desktop or web from one codebase
- You are a startup testing an idea and need both stores at launch
- Your current Flutter app needs a team that can upgrade and extend it
Flutter draws every pixel of the interface itself, so your app looks exactly as designed on an old Android phone, a new iPhone and a laptop browser alike.
Services
What our Flutter app development company builds
Design, Dart code, backend and release handled by the same people, so nothing gets lost in a handover.
Custom Flutter apps for iOS and Android
Consumer and business apps written once in Dart and released to the App Store and Google Play together, with platform details handled where users expect them.
Flutter MVPs for startups
A first version on both stores, scoped to the one journey that proves your idea, so you learn from real users before building the rest.
Design-heavy and branded interfaces
Custom animation, illustrated onboarding and unusual layouts are where Flutter shines. Our designers and developers work in the same team, so the build matches the Figma file.
Flutter for web and desktop
Internal tools, kiosks and companion apps for Windows, macOS or the browser, sharing the same code as your mobile app.
Backend, APIs and admin panels
The server side your app needs: authentication, a database, payments, notifications and an admin view, built in Python or Node.js or on Firebase.
Upgrades and maintenance
Flutter and Dart version upgrades, package updates, crash fixes and yearly iOS and Android changes on a monthly retainer.
The framework
Is Flutter good for app development?
For most apps, yes. It is open source, backed by Google and mature enough for serious products.
One codebase, many screens
The same Dart code runs on iOS, Android, web and desktop, so a feature is built once and tested everywhere it ships.
Design control down to the pixel
Flutter renders its own widgets instead of borrowing the platform's, which makes a strong visual brand much easier to hold across devices.
Smooth by default
Compiled to native machine code with its own rendering engine, Flutter handles animation and long scrolling lists comfortably on mid-range phones.
Hot reload during the build
Developers see changes in a running app within a second or two, which keeps design reviews quick and the build moving.
Where it is a weaker fit
If your company already runs on React, or the app must use every brand-new platform feature on day one, React Native or fully native code can be the better call.
Choosing a partner
How to choose the best Flutter app development company
Rankings and badges tell you little. These questions tell you more.
Ask to see apps on a real phone
Install something they built, scroll it on a cheap Android device and open it on an iPhone. Screenshots hide jank and broken layouts.
Ask who writes the code
Many firms sell with seniors and staff with juniors. At Kavion there are no juniors and no account managers, only the senior people you speak to.
Ask whether they also build in React Native
A team that only knows Flutter will recommend Flutter every time. We build in both, so our advice follows your product.
Ask what you will own
Code, developer accounts, cloud services and store listings should all sit in your name from the first day. With us, they do.
How it runs
Our Flutter app development process
- 01
Scope and fit
Screens, roles, integrations and target platforms listed, with an honest check that Flutter is the right framework.
- 02
Design system
Brand, components and motion designed in Figma, then built once as Flutter widgets the whole app reuses.
- 03
Build and test weekly
Test builds on TestFlight and Google Play every week, plus automated tests on the flows that matter most.
- 04
Launch and look after
Store listings, release pipeline, crash reporting and a handover pack, all under accounts you own.
Cost
How much does Flutter app development cost in 2026?
Usually less than two native apps, because one codebase serves both stores. Your price depends on the factors below, and we confirm it as a fixed quote after a scoping call.
Get a fixed quote→| What moves the price | Why |
|---|---|
| Number of screens and roles | A single-audience app is smaller than one that serves customers, staff and admins, each with their own screens and permissions. |
| Custom design and motion | Bespoke animation and illustrated flows look great in Flutter but still take design and build hours to get right. |
| Platforms beyond phones | Adding a web or desktop release means extra layouts, input handling and testing, even though the core code is shared. |
| Backend and admin panel | A new API, database and admin dashboard can be as much work as the app. Using Firebase or an existing backend reduces it. |
| Integrations and hardware | Payments, maps, chat, wearables or Bluetooth devices each add build time, testing and sometimes native platform code. |
| New build or an existing app | Taking over a Flutter app starts with an audit. Old package versions or missing tests can turn the first weeks into repair work. |
Tools we use for this
- Flutter
- Dart
- Firebase
- Riverpod
- Bloc
- Python
- FastAPI
- Node.js
- PostgreSQL
- Stripe
- Figma
- Codemagic
FAQ
Flutter app development questions
Install apps they have actually built and use them on a cheap Android phone and an iPhone, not just in a portfolio. Ask who will write your code, whether the team also builds in React Native so its advice is neutral, and whether your developer accounts and repository will be in your name. For a startup, also check that they will help you cut scope rather than quote for every idea, because the first version should be small and shipped.
Yes. Flutter is an open-source framework from Google that compiles to native code and draws its own interface, so one Dart codebase produces fast, consistent apps for iOS, Android, web and desktop. It is especially strong for custom, brand-heavy designs and animation. It is a weaker choice when your team already lives in React, or when the app relies on brand-new platform features the moment Apple or Google release them.
The price depends on the number of screens and user roles, how custom the design and motion are, which platforms you target, whether a backend and admin panel are part of the job, and which integrations you need. One shared codebase usually makes it cheaper than two native apps. We do not publish a price list because scopes vary so much, but we give a fixed quote after a short call and you can pick a budget range on the start a project form.
It depends on the app and the team. Flutter is the stronger pick for heavily branded interfaces that must look identical everywhere, and for products that also need desktop or embedded screens. React Native is usually better when you already have a React or Next.js web product, when the app should use each platform's native look, or when you want to hire from the larger JavaScript pool. We build in both and choose per project.
Almost any business or consumer app: booking and ordering apps, marketplaces, fitness and health trackers, field service tools, fintech dashboards, education apps and internal company tools. The same code can also run as a web app or a desktop app for Windows and macOS, which suits kiosks, back-office tools and companion apps. The main exceptions are graphics-heavy games and advanced augmented reality, which usually need a game engine or fully native code.
A focused first version usually takes around two to four months from agreed scope to store approval. The timeline depends mainly on how many screens and user roles the app has, the backend work, and how custom the design is. Larger products are split into releases so users get something useful early. We set milestones and a launch date in the quote, and you get a test build on your own phone every week.
Often, yes. A startup usually needs both app stores at launch, a distinctive look that stands out from template apps, and a small team doing everything. Flutter covers all three with one codebase and fast iteration through hot reload. The case for React Native is stronger if you already have a React web app whose code the mobile app could share. We look at your plans for the next two years before recommending either.
For nearly all business apps, yes. Flutter compiles to native machine code and uses its own rendering engine, so animations and scrolling stay smooth on mid-range devices. Where performance problems appear, they usually come from the app itself: rebuilding too much of the screen on every change, decoding large images on the main thread or loading too much data at once. Those are design and code issues we look for in every review.
Yes. We begin with an audit of the codebase: Flutter and Dart versions, package health, state management, tests and crash reports, with a build on real devices. You get a written plan ordered by risk. Then we upgrade and stabilise the app and carry on with features, or hand the plan to your own developers. Many inherited apps just need their packages brought up to date before anything new is added.
In India. We are a small senior team working remotely with clients in the US, UK, Canada, Australia and India. We plan overlap with your working day for calls and reviews, keep progress visible through weekly test builds, and reply within one business day. You talk directly to the designers and developers on your project, and the code, accounts and store listings all stay in your name.