What are mobile app development services? A guide for iOS and Android

Mobile app development services cover everything needed to put an app in people's pockets and keep it there: product strategy, UX and UI design, building the iOS and Android apps, the backend they talk to, testing on real devices, App Store and Google Play submission, and the steady stream of updates every app needs after launch. You can buy the whole journey from one partner or only the parts your team cannot cover.

Mobile is different from web in ways that catch first-time buyers out. Two companies, Apple and Google, review and can reject your releases. Their rules change every year, and both platforms set deadlines that force updates whether you planned them or not. Users judge an app in seconds and uninstall it just as fast. This guide explains what a mobile development service includes, the choices that shape cost and quality, the store rules few guides mention, and what you should own at the end.

What mobile app development services include

• Product discovery: who the app is for, the problem it solves, the smallest first release worth shipping and how success will be measured.
• UX and UI design: user journeys, wireframes, interactive prototypes and a visual design that respects iOS and Android conventions. See our product design service.
• App development: building the iOS and Android apps, natively or with a cross-platform framework.
• Backend and APIs: user accounts, data storage, business logic, payments, push notifications and an admin panel for your team.
• Integrations: payment providers, maps, analytics, CRM, identity providers, health or device data, and your existing systems.
• Quality assurance: automated tests plus manual testing on a range of real devices, screen sizes and operating-system versions.
• Security and privacy: secure storage, safe networking, privacy disclosures and compliance with the platforms' data rules.
• Store submission and release management: store listings, screenshots, privacy forms, beta testing and handling review feedback.
• Maintenance and evolution: operating-system updates, SDK upgrades, crash monitoring, bug fixes and new features.

First question: do you need an app at all?

An honest partner will ask this before anything else. Apps are worth building when people will use them repeatedly, when they need device capabilities such as the camera, Bluetooth, location in the background or biometrics, when offline use matters, or when being on users' home screens and sending notifications drives the business. If customers will visit once or twice a year, a fast mobile website is usually the better investment.

Apple is explicit that the App Store is not for repackaged websites: its review guidelines require an app to offer features and content that go beyond a website, and reject apps that are mainly marketing material or a collection of links. Meanwhile the web has closed some of the gap. A progressive web app can be installed to the home screen and, since iOS 16.4, can receive push notifications on iPhone once the user adds it. For many internal tools and simple customer services, that is enough. Our guide to web development services covers that route.

Native, cross-platform or web: the main build options

Once you know you need an app, the biggest technical decision is how to build it. Each option is a legitimate choice for some products and a poor one for others.

We compare the first two in depth in native vs cross-platform app development. The short version: cross-platform is the sensible default for most business apps today, and native is worth its extra cost when the experience itself is what you sell.

iOS and Android: why you probably need both

Worldwide, Android runs on far more phones. In October 2026, StatCounter measured Android at 72.36% of mobile operating-system usage and iOS at 27.61%. But the global figure hides big regional differences, and in several wealthier markets iPhone users are a much larger share, and often a larger share of spending. Look at the numbers for your own countries and, better still, at your existing website analytics, before deciding which platform comes first.

Launching on one platform first can be a sound way to learn cheaply, particularly for consumer apps. For business apps used by your own staff, or by customers who expect a choice, plan for both from the start; cross-platform frameworks make that much less expensive than it used to be.

The backend behind the app

Few useful apps live entirely on the phone. The backend is often half the work, and it is where data, money and security live. A typical app backend provides:

• Accounts and sign-in, including social and passwordless login, and account deletion.
• An API the app calls to read and change data, versioned so older app versions still in use keep working.
• Push notifications through Apple's and Google's services, with preferences users can control.
• Data sync and conflict handling for apps that work offline.
• Payments and subscriptions, kept in step with the stores' purchase systems where they apply.
• An admin panel so your team can manage users, content and support without a developer.
• Analytics, crash reporting and logs to understand how the app is used and where it fails.

Because anything inside an app can be inspected by a determined user, secrets and business rules belong on the server, not in the app. Our guide to frontend vs backend development explains why, and our backend development service covers the server side.

How a mobile app project runs

1. Discovery. Users, goals, the first release's scope, platforms, integrations and constraints. Ends with a plan and a realistic estimate.
2. Design and prototyping. Key journeys designed and tested as clickable prototypes with real users before code is written. Changing a prototype costs hours; changing a shipped app costs weeks.
3. Build in short iterations. App and backend developed in parallel against an agreed API, with installable test builds every week or two so you can use the app as it grows.
4. Testing on real devices. Automated tests for logic, plus manual testing across phones, tablets, screen sizes, operating-system versions, poor networks and accessibility settings.
5. Beta testing. TestFlight on iOS and testing tracks on Google Play put the app in real users' hands before launch. Note that new personal Google Play developer accounts must run a closed test with at least 12 testers for 14 continuous days before they can publish to production.
6. Store submission. Listings, screenshots, privacy disclosures, age ratings and a demo account for reviewers. Apple says it typically reviews at least 50% of submissions within 24 hours and 90% within 48 hours, but a rejection restarts the clock, so build in slack before any launch date.
7. Launch and monitoring. Staged rollouts, crash and performance monitoring, and a plan for responding to reviews and support requests.
8. Iterate. Release improvements on a steady cadence based on real usage, ratings and support themes.

App store rules that shape the build

Apple and Google act as gatekeepers, and their policies affect design and architecture, not just the final submission. These are the rules that most often surprise first-time app owners. Check the current versions before you plan, because both platforms update them regularly.

The in-app purchase rules deserve special care if you sell anything digital. They affect pricing, margins and how you design sign-up and upgrade flows, and they have been changing under regulatory and legal pressure in the EU, the US and elsewhere. Decide your monetisation model with the current rules in front of you, and expect to revisit it.

Security and privacy on mobile

A phone is a device you do not control, used on networks you cannot trust, by people who may lose it. The OWASP Mobile Application Security Verification Standard (MASVS) is the reference most security teams use, organised into groups covering storage, cryptography, authentication, network communication, platform interaction, code quality, resilience against tampering and privacy. In practice, a competent mobile team will:

• Store tokens and sensitive data only in the platform's secure storage (Keychain on iOS, Keystore-backed storage on Android), never in plain files or logs.
• Keep API keys and secrets on the server; anything compiled into the app can be extracted.
• Use HTTPS for every request and consider certificate pinning for high-risk apps, with a plan for rotating certificates.
• Enforce every permission and rule on the backend, assuming the app itself can be modified.
• Ask for device permissions only when needed, with a clear explanation, and keep working gracefully when they are refused.
• Audit third-party SDKs for the data they collect, because you are responsible for disclosing it.
• Add tamper and jailbreak or root detection where the risk justifies it, such as in banking and health apps.

Accessibility on mobile

Both platforms ship powerful accessibility features, VoiceOver and Dynamic Type on iOS, TalkBack and font scaling on Android, and an app that ignores them shuts out a meaningful share of its users. It is also a legal matter for some sectors: the European Accessibility Act covers consumer services such as e-commerce and banking, including when they are delivered through mobile apps, and has applied since 28 June 2025.

• Give every button, icon and image a meaningful label for screen readers, and test key journeys with VoiceOver and TalkBack switched on.
• Support the user's chosen text size without truncating or overlapping content.
• Keep touch targets comfortably large and spaced, and never rely on colour alone to convey meaning.
• Respect reduced-motion settings, and avoid gestures that are the only way to complete a task.
• Use the platforms' standard controls where possible; they come with accessibility built in.

Launch is the start of an app's life, not the end of the project. Every year brings new operating systems, new devices and new store deadlines, and an app nobody updates is an app that slowly stops working.

After launch: the update treadmill

Websites can sit untouched for months. Apps cannot. Apple and Google release major operating-system versions every year, both enforce minimum build and target requirements, and third-party SDKs for payments, analytics or maps ship updates and deprecations on their own schedules. On Google Play, apps that fall behind the target API requirement become unavailable to new users on newer Android versions.

• Test against beta versions of each new iOS and Android release over the summer, before they reach users.
• Upgrade build tools, SDKs and the cross-platform framework at least once a year.
• Watch crash-free rates, app start time and store ratings as health measures.
• Keep the backend API compatible with older app versions that users have not updated yet, and use a minimum-version check when you must force an upgrade.
• Budget for this work from day one. Our software maintenance and support guide explains how to plan it.

Ownership: accounts, signing keys and code

Mobile has an ownership trap websites do not. The app is tied to a developer account and to signing keys, and whoever holds those controls the app. If an agency publishes your app under its own developer account, moving it later is slow and sometimes messy. Make sure that:

• The Apple Developer Program and Google Play Console accounts are registered to your organisation, with your partner invited as a user with limited roles.
• Signing keys and certificates are stored securely under your control. On Android, Play App Signing lets Google hold the app signing key, and a lost upload key can then be reset.
• Push notification keys, analytics, crash reporting and backend cloud accounts are in your name.
• The source code for the apps and the backend lives in repositories your organisation owns, with the intellectual property assigned to you.
• Store listing assets, design files and build instructions are documented so another team could ship the next release.

What drives the effort, with a worked example

The biggest effort drivers are the number of screens and user journeys, whether you build natively or cross-platform, how much the app must do offline, device features such as camera, location, Bluetooth or health data, the complexity of the backend and integrations, real-time features such as chat or live tracking, payments and subscriptions, and regulatory requirements in sectors like health and finance.

As an illustration of shape rather than a quote: a booking app for a clinic group, with sign-in, service search, booking and rescheduling, payments, reminders by push notification and an admin panel, built cross-platform for iOS and Android, might take a senior engineer leading, one more mobile engineer, one backend engineer for part of the time and a designer early on, roughly three to five months to a first store release. A native build of the same scope would typically need separate iOS and Android effort for the app layer. Explore your own scenario in the software cost calculator.

Choosing a mobile app development partner

• Who will build our app, and can we meet them before we sign?
• Which approach would you recommend for us, native, cross-platform or web, and why? Be wary of a partner whose answer is always the same.
• Show us apps you have taken through App Store and Google Play review. How did you handle rejections?
• How do you test on real devices and older operating-system versions?
• How do you approach security and privacy disclosures, including third-party SDKs?
• Whose developer accounts will the app be published under?
• What happens after launch: who handles OS updates, SDK upgrades and store deadlines?

How Authect approaches mobile app development

Authect is a founder-led studio: you talk to the founders who build your app, never a salesperson. Every project is led by a senior engineer, with a small team covering the app, the backend and design together so decisions are not lost in hand-offs. We use AI to accelerate delivery, and an engineer reviews every line. We will tell you honestly if a mobile website would serve you better than an app.

Your developer accounts, signing keys, code, infrastructure and designs are yours from day one, with no lock-in. We work as fixed-price projects for well-defined first releases, monthly sprints for apps that keep evolving, and support and evolution to keep your app current with every OS release. If you are planning an iOS or Android app, talk to us.