You need iOS and Android at launch
One team ships both apps from the same code, so features, fixes and releases land on both stores at the same time instead of drifting apart.
Cross-Platform App
Development Services
Cross-platform app development means building one app for iOS and Android from a single codebase, usually with React Native or Flutter. Tapptitude is a cross-platform app development company: we design, build and maintain apps for startups and companies that need both app stores covered without paying for two separate native teams.
One codebase.
Two app stores.
We've built 150+ web and mobile products over the past 12+ years. On every cross-platform project we pick React Native or Flutter for what your product needs, write native code where a feature calls for it, and stay with you after launch to maintain and grow the app.
Reviewed by
Alex Tudose, Technical Director
Last updated:
Cross-platform mobile app development at a glance
- Time to MVP
- About 8 weeksFour two-week sprints, each ending with a demo and a build you can install.
- Pricing
- New appfrom $25,000MVP with design, backend and the release in both storesCode auditfrom $1,000One week, with a prioritized list of fixesMaintenancefrom $900/moUpdates, fixes and new OS versions after launch
- Frameworks
React Native
FlutterReact Native with Expo, or Flutter. Native Swift or Kotlin where a feature needs it.
- One codebase
- iOS AndroidWeb appAdmin panelBackend
- Your team
- Product managerDesignerCross-platform developersQASized to your project.
- Track record
- 150+web and mobile products over 12+ years
When to choose cross-platform
Your budget covers one team, not two
Screens, business logic and API code are written once. Native code is added only where a feature needs it, such as payments, Bluetooth or background tasks.
Your web team already works in React
React Native uses TypeScript and the same patterns as React, so your web developers can read, review and contribute to the mobile code.
Your app is content, commerce or workflows
Feeds, bookings, payments, chat, maps, subscriptions and dashboards are well covered by React Native and Flutter, and make up most of the apps we build.
You want to validate the idea fast
A first version can reach both stores in about 8 weeks, so you learn what real users do before committing to a bigger roadmap or to two native apps.
When to choose native
Your app runs on 3D, AR or real-time graphics
Games, AR and complex real-time rendering get the most out of Swift and Kotlin with direct access to the GPU and platform frameworks.
You need new platform features on day one
If the product depends on the newest OS features (widgets, Apple Watch, CarPlay, Android Auto) from the day Apple or Google releases them, native code avoids waiting for framework support.
Your native apps already work well
If mature iOS and Android apps and the teams behind them already deliver, a rewrite costs more than it saves. We extend and maintain the native apps instead.
Still weighing native against cross-platform?
Cross-platform mobile app development services
New cross-platform app
From the first workshop to both app stores. Product definition workshops come first, then UI design and an interactive prototype; with the screens agreed we write the detailed scope and the final estimate. Development runs in two-week sprints with QA, a demo and a build you can install after each sprint, through to the App Store and Google Play release.
Cost
From $25,000
Timeline
MVP in about 8 weeks
Migration from native
Move a native iOS and Android pair to React Native or Flutter without stopping releases. We audit both apps first, decide what moves and in which order, and migrate screen by screen, keeping native modules where they still make sense, so users keep getting updates while the two codebases become one.
Cost
Estimated after an audit
Timeline
Depends on the app
Take over an existing app
Your agency or developer left and the React Native or Flutter app still needs releases. We start with a one-week audit of the code, dependencies and build setup, fix what blocks the next release, and then take over maintenance or new development, whichever the product needs.
Cost
Starts with the $1,000 audit
Timeline
Audit in 1 week
Cross-platform code audit
An independent review of your React Native or Flutter app: architecture, performance, security, dependencies, tests and CI/CD. You get a prioritized list of fixes, so you know what slows the app or the team down and what to do first.
Cost
From $1,000
Timeline
1 week
AI prototype to production app
You built a prototype with an AI app builder and people want to use it. We turn it into a production app: we keep what works, rebuild what will not scale, add a secure backend, user accounts and payments, and release it to both stores with maintenance after launch.
Cost
Estimated after a call
Timeline
From 8 weeks
AI features in your app
Add an AI assistant, recommendations, search or document processing to an existing cross-platform app. We agree the goal and how it will be measured first, then build and ship the feature. For a UK digital-health startup we built a Flutter app with a conversational AI care agent and native sensor modules.
Cost
Estimated after a call
Timeline
Depends on the feature
Packages and pricing
Cross-Platform MVP
A first version of your app on iOS and Android, from one codebase, with the backend and admin panel it needs.
Cost
starting from $25,000
Timeline
about 8 weeks
Cross-Platform Code Audit
We find what makes your React Native or Flutter app slow, unstable or hard to maintain, and list the fixes in priority order.
Cost
starting from $1,000
Timeline
1 week
Worry-free maintenance
We keep your app working on every new iOS and Android version and ship your updates, so you can focus on the business.
Cost
starting from $900
Timeline
monthly subscription
React Native vs Flutter
The two leading frameworks for cross-platform development both let one team ship to iOS and Android from one codebase. They differ in language, in how the UI is drawn and in the team you need.
| Criterion | React Native | Flutter |
|---|---|---|
| Language | TypeScript / JavaScript | Dart |
| How the UI is drawn | Native iOS and Android components | Its own rendering engine, identical on both platforms |
| What is shared | UI and business logic | UI and business logic |
| Strong fit | Teams that already use React, content and commerce apps, fast updates | Custom, brand-heavy UI and animations |
| Watch out for | Native modules for less common device features | Larger app size, Dart skills to hire |
| Our work | Holiday Hero, Arenova, Ometria SDK | Reverse Health, a white-label travel app, a digital-health MVP |
Go deeper on React Native and Flutter
How we build
cross-platform apps
1. Product definition workshops
Workshops with your team that produce a Lean Canvas, the target audience, user personas, user flows and a high-level MVP scope.
2. UI design, prototype and final estimate
UI designs with your brand and an interactive prototype that follows iOS and Android conventions. With the screens agreed, we write the detailed scope, the final estimate and the timeline.
3. Development in two-week sprints
A demo at the end of every sprint and a build you can install and test on your phone. Your feedback goes into the next sprint.
4. Release on both stores
Store listings, review guidelines, analytics and crash reporting set up, then a coordinated App Store and Google Play release.
5. Maintenance and growth
OS updates, framework upgrades and new features after launch, on a monthly plan or on demand.
1. Product definition workshops
Workshops with your team that produce a Lean Canvas, the target audience, user personas, user flows and a high-level MVP scope.
Cross-platform apps we've built
- Flutter /
- Healthcare /
- US
A weight-loss programme for women in menopause, built as one Flutter app with its backend and web. Today the programme counts 1.1M+ women.
- 12k+
- paid subscriptions
- 10k+
- daily active users
- 15k+
- monthly active users
Reverse Health
The menopause diet that works
- 12k+
- paid subscriptions
- 10k+
- daily active users
- 15k+
- monthly active users
- React Native /
- Hospitality /
- Netherlands
The guest app for short-term rentals and hotels, with guests booking additional services right in the app.
- 4,000+
- listings in 23 countries
- 87%
- app installation rate
- 60%
- of guests book extra services
Holiday Hero
Digitizing all guest interactions beyond the booking.
- 4,000+
- listings in 23 countries
- 87%
- app installation rate
- 60%
- of guests book extra services
Flutter / Travel
Client under NDA
Travel companion
Built for a global travel-technology provider: travel agencies ship the app under their own brand, with one itinerary timeline and real-time trip notifications.
- 15M+
- downloads
- 3M+
- users
Case study under NDA
Travel companion
A white-label app that travel agencies ship under their own brand.
- 15M+
- downloads
- 3M+
- users
- React Native /
- Lifestyle /
- Belgium
A football fan companion app from Antwerp, launched in October 2025. Supporters log every match they watch, at the stadium or on the sofa.
- 1,000+
- leagues, down to the fourth division
Arenova
Log every match you watch, relive the memories and get insights from your own football history.
- 1,000+
- leagues, down to the fourth division
Our cross-platform tech stack
React Native
Meta's framework for iOS and Android apps from one TypeScript codebase, rendering native components. We use it with Expo.
TypeScript
Typed JavaScript for the React Native app, the web app and the Node.js backend.
Dart
The language of Flutter apps, compiled to native code for iOS and Android.
Flutter DevTools
Profiling and debugging for Flutter apps: UI inspection, frame timing, memory and app size.
Firebase
Authentication, push notifications, analytics and crash reporting for both platforms.
Node.js
Backend runtime for the APIs behind the apps.
NestJS
Structured Node.js framework we use for larger backends and admin APIs.
Continuous Integration
Builds and store releases with GitHub Actions, Bitbucket Pipelines, Codemagic or Bitrise.
Figma
UX/UI design and clickable prototypes for iOS and Android.
XCode
Native iOS modules, signing and App Store releases.
Android Studio
Native Android modules, signing and Google Play releases.
React Native
Meta's framework for iOS and Android apps from one TypeScript codebase, rendering native components. We use it with Expo.
TypeScript
Typed JavaScript for the React Native app, the web app and the Node.js backend.
Dart
The language of Flutter apps, compiled to native code for iOS and Android.
Industries we build cross-platform apps for
You're In Great Company
4.5
Barry Livingston
CTO, Glorify
"Tapptitude has great people. They're smart, competent, professional, and easy to work with. In addition, they take their work seriously and are very responsive to requests. Solutions are generally good quality, especially in the mobile codebases."
5.0
Myles Munro
Co-founder/ Board Member, Slite
"Highly knowledgeable and skilled. They added significant value from the early scoping phase through to development, testing and iteration. They are very thorough, diligent and timely."
5.0
Andrew Smith
CEO, OnTapp
"Tapptitude is a very good development agency. Iโve been delighted with the results and their adherence to our timeframe and budget. Looking at competitor products on the market, weโve managed to produce something better in a shorter period of time."
Clients that trusted us
150+
$250M+
10+
12+
Cross-platform app development FAQs
Cross-platform app development services at Tapptitude start from $25,000 for an MVP on iOS and Android, including design, backend and the release in both app stores. If you already have the designs and a backend or API, the mobile apps alone start from $15,000. Larger products cost more; we give a firm estimate after a short product definition phase. Two prices are fixed up front: a cross-platform code audit from $1,000 (one week) and maintenance from $900 per month.
A focused cross-platform MVP takes about 8 weeks: four two-week sprints, each ending with a demo and a build you can install on your phone. For example, we took a UK digital-health startup from concept to a tested Flutter MVP in 8 weeks. Larger products take longer, and we confirm the timeline after product definition, together with the scope and the final estimate.
For most apps, yes: users can't tell a well-built cross-platform app from a native one. React Native renders native components, and Flutter compiles to native code with its own rendering engine. Native is still the better choice for heavy 3D, AR or apps that depend on the newest OS features on day one. Where a feature needs native code, we write it as a native module inside the cross-platform app.
Choose React Native if your team already works with React and TypeScript, or if you want fast over-the-air updates. Choose Flutter for highly custom, brand-heavy UI and animations. Both cover iOS and Android well, and we build with both, so the recommendation follows your product and your team. See the comparison above and our Flutter vs React Native guide.
Yes, we migrate native iOS and Android apps to React Native or Flutter. We start with an audit of the native apps, then usually migrate screen by screen, so the app keeps shipping to the stores while it moves. Native code stays where it is the better tool, for example for payments or background tasks. The audit also gives you the migration plan and an estimate before any code moves.
A well-built cross-platform app is not noticeably slower than a native one. Slowness usually comes from fixable causes: unnecessary re-renders, heavy traffic between JavaScript and native code in React Native, dropped frames in Flutter, or oversized images. Our cross-platform code audit, from $1,000 in one week, measures these and lists the fixes in priority order.
Yes, taking over an app another team built is one of the most common ways clients start with us. We run a one-week audit, take over the repositories, the build pipeline and the store accounts, then continue with maintenance from $900 per month or with new development. The audit report tells you what state the code is in before you commit to anything else.
We are a cross-platform app development company, which is what most people mean by hybrid app development today: one codebase and real native apps for iOS and Android, built with React Native or Flutter. In the strict sense, a hybrid app is a web app running inside a native shell, as with Ionic or Cordova. We don't build those; if you have one, we can migrate it to React Native or Flutter.
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Planning a cross-platform app?
Let's scope it together.
Tell us what you're building. We'll come back with the framework we'd pick, a first estimate and the questions to answer before development starts.
Let's chat