How much does it cost to build a mobile app?

A focused cross-platform MVP with clear scope — user authentication, one or two core workflows, and basic back-end API — typically ranges from £25,000–£60,000 depending on complexity and team location. Feature-complete apps with complex data models, third-party integrations, real-time features, or custom animations range from £60,000–£200,000+. The largest driver of cost is scope clarity: well-defined requirements produce accurate estimates; vague requirements produce budget overruns.

React Native or Flutter — which should we choose?

React Native is the better choice if your team has JavaScript/TypeScript experience, you have an existing web codebase to share logic with, or you need access to the largest ecosystem of third-party libraries. Flutter is preferable for highly polished, animation-heavy UIs, teams comfortable with Dart, or projects requiring consistent pixel-perfect rendering across both platforms. For most business applications, both are excellent choices and the decision comes down to your team's background.

How long does it take to get an app approved on the App Store?

Apple's review process typically takes 24–48 hours for straightforward apps, but can take 1–2 weeks if your app is complex, requires special permissions, or gets flagged for review. First-time submissions have a higher rejection rate — common reasons include incomplete privacy disclosures, in-app purchase implementation issues, and metadata that doesn't match the app's actual functionality. Build 2–4 weeks of submission buffer into your launch timeline.

Definition

What is Mobile App Development?

Mobile app development is the process of designing, building, testing, and deploying applications for mobile devices — primarily iOS (iPhone/iPad) and Android smartphones and tablets.

Why It Matters for Your Business

Mobile devices account for over 60% of global web traffic — and for many categories of user behavior, mobile apps produce significantly higher engagement and retention than mobile websites. The native experience — push notifications, biometric authentication, offline functionality, and hardware access — creates engagement mechanics that web cannot replicate. For businesses where frequent, repeat user interaction is core to the value proposition, a well-built mobile app is not a luxury add-on to a web product but a distinct competitive advantage.

How Mobile App Development Works

Modern mobile app development is predominantly cross-platform — using frameworks like React Native or Flutter to build a single codebase that compiles to both iOS (App Store) and Android (Google Play). This approach reduces initial development cost by 40–60% compared to maintaining separate native codebases in Swift (iOS) and Kotlin (Android), and ensures that both platforms receive feature updates simultaneously rather than one lagging behind the other.

The development process starts with UX design — mapping user journeys, defining the information architecture, and creating interactive prototypes before writing code. Mobile UI has strict conventions (navigation patterns, gesture behavior, screen density) that differ significantly from web. Skipping this phase and going directly to code produces apps that feel unnatural to use even when they are technically functional.

App Store submission is a process that most first-time app publishers underestimate. Apple reviews every iOS app for compliance with its App Store Review Guidelines — a detailed document covering privacy, data collection, in-app purchases, and content standards. Rejection is common on first submission, with specific required changes. Android is less restrictive but still requires compliance with Play Store policies. Managing the submission process, responding to rejection reasons, and iterating for approval is a distinct skillset from app development.

Post-launch, mobile apps require ongoing maintenance in ways that web applications do not. iOS and Android release major OS updates annually, and apps that are not updated to remain compatible risk being removed from the stores or producing errors on the latest devices. App Store policies change regularly. New device screen sizes appear. Push notification permission models evolve. Budget and plan for ongoing maintenance as a cost of operating a mobile product — it is not optional.

Common Misconceptions

Myth

“A responsive website is good enough — you don't need a mobile app”

Reality

For many use cases, this is true. But for applications requiring push notifications, offline functionality, camera or GPS access, biometric authentication, or high-frequency repeat usage, a native or cross-platform app consistently outperforms a responsive web app on engagement and retention metrics. The decision should be driven by user behavior requirements, not a blanket assumption either way.

Myth

“Cross-platform apps are always inferior to native apps”

Reality

React Native and Flutter apps are indistinguishable from native apps for the vast majority of use cases — standard navigation, forms, lists, maps, and media. The gap exists at the edges: apps requiring deeply hardware-specific features (ARKit, advanced CoreML, complex animations) may benefit from native development. For business applications, cross-platform delivers native-quality experience at significantly lower cost.

Myth

“App development is finished at launch”

Reality

Launch is the start of the product lifecycle, not the end of development. User feedback after launch almost always reveals UX improvements, unexpected usage patterns, and feature requests. OS updates require ongoing compatibility work. App store rankings respond to review velocity and crash-free rate — both require active management. A realistic mobile app budget includes 15–20% of the build cost annually for maintenance and iteration.

Related Concepts

React NativeFlutteriOS developmentAndroid developmentcross-platform

Questions & Answers

How much does it cost to build a mobile app?: A focused cross-platform MVP with clear scope — user authentication, one or two core workflows, and basic back-end API — typically ranges from £25,000–£60,000 depending on complexity and team location. Feature-complete apps with complex data models, third-party integrations, real-time features, or custom animations range from £60,000–£200,000+. The largest driver of cost is scope clarity: well-defined requirements produce accurate estimates; vague requirements produce budget overruns.
React Native or Flutter — which should we choose?: React Native is the better choice if your team has JavaScript/TypeScript experience, you have an existing web codebase to share logic with, or you need access to the largest ecosystem of third-party libraries. Flutter is preferable for highly polished, animation-heavy UIs, teams comfortable with Dart, or projects requiring consistent pixel-perfect rendering across both platforms. For most business applications, both are excellent choices and the decision comes down to your team's background.
How long does it take to get an app approved on the App Store?: Apple's review process typically takes 24–48 hours for straightforward apps, but can take 1–2 weeks if your app is complex, requires special permissions, or gets flagged for review. First-time submissions have a higher rejection rate — common reasons include incomplete privacy disclosures, in-app purchase implementation issues, and metadata that doesn't match the app's actual functionality. Build 2–4 weeks of submission buffer into your launch timeline.

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