What it costs to build a mobile app

Mobile app development cost depends on the number of screens and user journeys, the backend and admin panel behind the app, whether you build for one platform or both, and the features that need extra work such as payments, maps or offline use. Many app quotes focus on the screens and leave out the server and admin tools, which are often a large part of the effort. Understanding every part helps you compare quotes fairly.

A mobile app is software people install on a phone, usually from Apple's App Store or Google Play. We will not quote prices here, because they vary by scope, region and team. Instead, this guide explains what drives the effort, what continues after launch and how to get a reliable estimate. Our mobile app service page describes how we build apps.

What drives mobile app development cost

A handful of decisions shape most of the budget:

• User journeys. Each task a user can complete, such as signing up, booking, ordering or messaging, needs screens, logic and testing.
• User types. An app for customers only is simpler than one with separate experiences for customers, staff and managers.
• Backend and admin. The server, database and admin panel that store data and apply your rules.
• Platforms. iPhone, Android or both, and whether you use one shared codebase or separate native apps.
• Special features. Payments, maps and location, camera use, offline mode, real-time updates or integrations with other systems.
• Design depth. A custom visual design with animations takes longer than a clean design built on standard components.

Design and screens

Design turns the idea into screens people can use. It usually happens in two stages.

1. User flows and wireframes. Simple layouts of each screen and how they connect. This is where most usability problems are found cheaply.
2. Visual design. Colours, typography, icons and the final look of each screen, plus how it adapts to different phone sizes.

The number of screens affects the effort, but so do their states. Each screen may need versions for loading, empty data, errors and no internet connection. Accessibility work, such as readable text sizes and clear contrast, should be part of the design, not an extra at the end.

Backend, admin panel and APIs

The backend is the part of the system that runs on a server. It stores users and data, applies business rules and sends notifications. An API (application programming interface) is how the app and the backend exchange data.

What the backend includes

• User accounts, login and password reset.
• The data behind each journey, such as bookings, orders or messages.
• Business rules, such as availability, pricing or approval steps.
• Push notifications, the messages that appear on the phone when the app is closed.
• Integrations with payment gateways, email services or existing business systems.

The admin panel

Most apps need an admin panel: a website where your team manages content, users, orders or bookings. Its size depends on what your team must do every day. It is often underestimated, yet it decides how much manual work the app creates for your staff.

If you already have a website or business system, the app may be able to use its data through a new API. That can reduce effort, but the existing system must be able to support it securely.

One platform or both

You can launch on iPhone, Android or both.

• One platform first. Launching where most of your users are can reduce the first budget and let you learn before expanding.
• Both platforms with a cross-platform approach. One shared codebase runs on both platforms, which usually reduces the effort compared with building two separate apps. Some platform-specific work is still needed.
• Separate native apps. Each platform is built with its own tools. This gives the most control over platform features, but means two codebases to build and maintain.

The right choice depends on your users, the features you need and your long-term plans. Ask each developer to explain their recommendation for your case.

Adding the second platform later

If you launch on one platform first, plan for the second from the start. Build the backend and admin panel so they serve any app, and keep business rules on the server rather than inside the app. Then adding the second platform means building a new app on top of an existing, tested system, rather than repeating all the work. Ask developers how their proposal would handle a later expansion, and what it would involve.

A progressive web app avoids separate store apps altogether, as our comparison of progressive web apps and native apps explains.

Phases of work and what changes the effort

Most app projects follow similar phases:

1. Discovery. Agreeing users, journeys, features and what belongs in the first version.
2. Design. Wireframes, then visual design, reviewed with real users where possible.
3. Build. App, backend and admin panel, delivered in stages you can test.
4. Testing. On real devices, different screen sizes and poor connections, plus beta testing with users.
5. Store submission. Preparing store listings, screenshots and privacy details, and passing the review processes.
6. Launch and support. Monitoring crashes and feedback, and releasing fixes quickly.

Effort grows when features are added mid-build, when third-party services are poorly documented, when store review requires changes, or when decisions wait on approvals. A focused first version, often called an MVP (minimum viable product), keeps these risks smaller. Our guide on how to plan the first version of a mobile app explains how to choose what goes into it.

Running costs after launch

Apps have ongoing costs that should be part of the budget from the start:

• Developer accounts. Publishing on the App Store requires membership of the Apple Developer Program, which has an annual fee. Google Play requires a developer account with a one-time registration fee.
• Hosting. Servers and databases for the backend, plus backups and monitoring.
• Third-party services. Push notification, email, SMS, maps and payment services may charge by usage.
• Maintenance. New phone operating system versions and store policy changes require updates, even if you add no new features.
• Support and fixes. Responding to crashes, user reports and security issues.
• Improvements. New features based on real user behaviour, which is usually where an app's value grows.

Ask each provider what is included after launch and what is charged separately.

How to get an accurate quote

Before asking for quotes, prepare:

1. A one-page description of the app, its users and the problem it solves.
2. The main user journeys, written as simple steps.
3. The features you need at launch, and those that can wait.
4. Any existing systems the app must connect to.
5. Your preferred platforms, or ask the developer to recommend.

Ask each developer to break the estimate into design, app, backend, admin panel and testing, and to list assumptions and exclusions. Quotes that only mention screens are likely missing part of the work.

Our guide on preparing to hire a mobile app developer explains how to compare proposals fairly.

Summary

• Journeys, user types, backend, platforms and special features drive most of the cost.
• The backend and admin panel are a large share of the work and are often left out of quotes.
• Launching on one platform or with a shared codebase can reduce the first budget.
• Plan for developer accounts, hosting, services, maintenance and improvements.
• Compare quotes broken down by design, app, backend, admin and testing.

A clear first version and an honest view of running costs make an app budget far easier to plan. If you're planning a mobile app, you can tell us about it here.