How to Build an App: A Step-by-Step Guide for Businesses and Founders

Updated September 2026 · Written and maintained by the Progression Agency strategy team

Building an app takes ten steps: define the problem, research users and competitors, choose the core feature, decide the platform approach, pick how it will be built, design and prototype, develop in iterations, test, launch to the app stores and grow. This guide walks through each step, the options for building it yourself, with no-code tools or with a development team, and how apps make money.

Step 1: Define the problem and who has it

Write one sentence: who the app is for, what problem it solves and how they solve it today. If you cannot name the person and the current workaround, the idea needs more work before any design.

Step 2: Validate the idea before building

Interview 10-20 people who have the problem, check competing apps and their reviews, and test demand with a landing page or waitlist. Evidence that people want it is worth more than any feature.

Step 3: Choose the core feature for version one

Pick the one job the app must do well and cut everything else to a later release. This first version is your minimum viable product.

Step 4: Decide iPhone, Android, both or web

Build first where your users are. US consumer apps often start on iPhone; field and international apps often start on Android; a web app reaches everyone without a store. Cross-platform frameworks reach both stores from one codebase.

How to make an app for the iPhone

Native iPhone apps are built in Swift with Xcode on a Mac and published through the Apple Developer Program ($99 per year). See iOS app development.

How to build an app on Android

Android apps are built in Kotlin with Android Studio and published through Google Play (one-time $25 fee; new personal accounts must run a 12-tester, 14-day closed test). See Android app development.

How to build an app for both

React Native or Flutter produce iPhone and Android apps from one codebase; see cross-platform app development.

Step 5: Choose how to build it

Build your own mobile app by learning to code

Free official resources from Apple, Google and the React Native and Flutter teams can take a motivated beginner to a simple app in months. It is the cheapest route and the slowest.

How to make an app without code

No-code builders let you assemble screens, data and logic visually. They are excellent for prototypes and simple internal apps, with limits on custom logic, performance and ownership; see app development tools and platforms.

How to build an app with AI

AI coding assistants speed up development for people who can read and test code, and AI app builders generate simple apps from prompts. They do not remove the need for design, testing, security and store compliance.

Hire an app development team

For a product that must scale, handle payments or integrate with other systems, a team covers design, engineering, QA and launch; see how to hire app developers.

Step 6: Design and prototype

Sketch the main screens, then build a clickable prototype in a design tool such as Figma and watch five target users try it. Fix confusing flows now; changes are cheapest before code.

Step 7: Develop in short iterations

Build in one- or two-week cycles, each ending with a version you can install and test. This is how agile development keeps projects on track.

Step 8: Test on real devices

Test on the phones your users carry, on poor connections and with accessibility features turned on. Use TestFlight for iPhone betas and Google Play testing tracks for Android.

Step 9: Publish to the App Store and Google Play

Prepare screenshots, descriptions, privacy details and a test account for reviewers, then submit. Apple reviews apps against its App Store Review Guidelines; Google reviews against its developer policies.

Step 10: Launch, market and improve

Optimize your store listing for search, tell your existing audience, and measure activation and retention from day one. Improve based on what users do, not what they say.

How to build an app for your business

For a business app, start from the process it improves or the customer need it serves, confirm a website cannot do the job, and plan integrations with the systems you already use. Most business apps are built by a development team; see our app development services.

How to make an app that makes money

Apps earn through subscriptions, in-app purchases, freemium upgrades, advertising, selling physical products or services, and B2B licensing. Choose the model before design, because it shapes onboarding, paywalls and features.

Apple charges a 15% commission on digital sales for developers in its Small Business Program (up to $1 million in prior-year proceeds); physical goods and services sold through apps use normal payment processors.

How much does it cost to build an app?

Costs range from nearly nothing for a no-code prototype to $40,000-$150,000+ for a professionally built first release. See the full app development cost guide.

How long does it take to build an app?

A no-code prototype can take days; a professionally built MVP commonly takes 10-16 weeks; a full two-platform business app 4-7 months.

Common mistakes when building an app

• Building before talking to users.
• Too many features in version one.
• Choosing platforms without data.
• Skipping the prototype.
• No marketing plan.
• Ignoring ongoing maintenance costs.

Your app launch checklist

Use this list in the final weeks before release. Each item has delayed a launch when it was left too late.

Can I build an app myself?

Yes, for some apps. No-code tools can produce working apps for simple, form-based use cases. A custom build is the better route when the app is the product, needs to scale, or must integrate deeply with other systems.

Frequently asked questions