A mobile app is a program you download onto a phone or tablet, usually from Apple's App Store or Google Play. It gets an icon on the home screen, opens full screen and can use the phone's features, like the camera, notifications or location. Instagram, your banking app and a delivery app are all mobile apps.

The term concerns sellers because the question comes up sooner or later: "Should my brand have its own app?" An agency may pitch one. A competitor may launch one. This page explains what an app really is, what it costs and when it is worth it, compared with a store that simply works well in a mobile browser.

What is a mobile app?

A mobile app is software written to run on a mobile operating system, mainly iOS on iPhones and Android on most other phones. It is installed on the device and stored there, which is the key difference with a website that is loaded in a browser each time.

There are three main ways to build one:

  • Native apps. Built separately for each platform with its own tools, Swift for iOS and Kotlin for Android. They are the fastest and have full access to the phone, but you maintain two codebases.
  • Cross-platform apps. Built once with a framework like React Native or Flutter, then compiled for both platforms. This is the common choice for small and mid-size projects.
  • Hybrid or wrapper apps. A website packaged inside an app shell. Cheap to make, but often feel slow, and app stores sometimes reject them when they add nothing beyond the website.

A mobile app is not the same as a mobile website. A mobile site, or a responsive site, is a normal website that adapts its layout to a small screen. It is also not a progressive web app, which is a website that can be added to the home screen and work partly offline without going through an app store. And it is not the same as mobile commerce, which is the act of buying on a phone, whatever the tool.

Related vocabulary: app store listing, push notification, in-app purchase, deep link (a link that opens a specific screen in an app) and app review (the check Apple and Google perform before publishing an app or an update).

Why it matters

For most online stores, the majority of visits already come from phones. So "mobile" matters enormously. The real question is whether mobile customers need an app or a fast mobile website.

An app has real strengths. It sits on the home screen. It can send push notifications, which often get more attention than email. It can remember the customer, keep them logged in and make reordering one tap. For brands with loyal, frequent buyers, those advantages can raise repeat purchases.

But the entry cost is high. Let's put numbers on it. A brand with 800 orders a month and an average order value of $50 does $40,000 in monthly revenue. A decent cross-platform shopping app built by an agency costs roughly $30,000 to $80,000, plus perhaps 15% to 20% of that each year for updates, new OS versions and bug fixes. Say $40,000 to build and $8,000 a year to maintain.

Now look at adoption. If 10% of customers install it, that is about 80 buyers a month. Even if app users order 30% more often, the extra revenue is around $1,000 a month, or $12,000 a year, before product costs. After paying for maintenance, it can take many years to earn back the build cost. The same budget spent on a faster checkout or better product pages would reach 100% of visitors, not 10%.

The math changes for a brand with tens of thousands of weekly repeat buyers, like a food delivery service or a large fashion retailer. At that scale, the app becomes the main channel.

How it works

The life of a mobile app follows a predictable path:

  • Design. Screens are planned for touch, small displays and one-hand use.
  • Development. The app is built natively or with a cross-platform framework. A shopping app almost always talks to a back end, through an API, to fetch products, prices and stock and to send orders.
  • Store review. Apple and Google check each version against their rules before it goes live. A review can take from a few hours to several days, and rejections happen.
  • Distribution. Customers find the app in the store, download it and install it. Each step loses people.
  • Updates. Every fix or new feature requires a new version, a new review and customers updating the app. Some users stay on old versions for months.
  • Maintenance. Each year, new iOS and Android versions arrive and may break something. Apps that are not updated eventually stop working or get removed from stores.

Money flows have their own rules too. Apple and Google take a commission, historically 15% to 30%, on digital goods and subscriptions sold inside an app. Physical products, like clothing or cosmetics, can generally be paid through a normal payment provider. A creator selling a course inside an app faces a very different cost structure than on a website.

Benchmarks and examples

A few reference points to keep expectations realistic:

  • Most installed apps are abandoned fast. A large share of users open a new app only once or twice, and retention after 30 days is often in the single digits for shopping apps.
  • Build costs vary widely. A simple app starts around $15,000 with a freelancer. A polished shopping app with accounts, wishlists and notifications from an agency is commonly $40,000 to $150,000.
  • Store commissions matter for digital products. A $100 course sold in-app might net $70 to $85 after the store's cut, versus about $97 on the web after card processing.

Typical situations:

  • A creator selling presets and a course. A fast mobile store and a link in bio cover nearly all needs. An app adds cost and a store commission.
  • A small brand with 300 orders a month. A well-built mobile storefront, email and SMS reminders beat an app on cost and reach.
  • A brand with a very loyal community and weekly purchases. An app can make sense, ideally once the mobile website already converts well.

Common mistakes

  • Building an app before the mobile site converts. An app will not fix a slow checkout or unclear product pages. It inherits them.
  • Underestimating maintenance. The build is the beginning. OS updates and store rule changes come every year.
  • Expecting organic downloads. An app store listing brings little traffic on its own. You must push people to install it, which costs marketing effort.
  • Forgetting store commissions on digital products. In-app sales of courses or memberships can cost far more than web sales.
  • Choosing a wrapper app to save money. A website in an app shell often feels worse than the website itself and may be rejected.

Best practices

  • Start with the mobile web. Make sure your store loads fast on a phone, with a checkout that works in a few taps. Measure your mobile conversion rate first.
  • Define the job the app does better. Reordering, loyalty, exclusive drops or offline use. If you cannot name one, you do not need an app yet.
  • Estimate adoption honestly. Base the business case on 5% to 15% of your active customers installing it, not all of them.
  • Budget for three years, not one. Include maintenance, store fees and marketing to drive installs.
  • Keep one catalog and one order system. The app should use the same products, stock and orders as your store, never a separate copy.
  • Consider a progressive web app first. It gives some app-like benefits without store review or commissions.

In Roctify

Roctify does not offer a native mobile app for your customers. Instead, every storefront and link-in-bio page is optimized for mobile browsers, with a cart and one-page checkout designed for phones. Your customers buy in a few taps from Instagram, TikTok or a text message, without installing anything.

Products, stock, customers and orders live in one shared catalog, so whatever channel you add later works from the same data. If your business grows to the point where a dedicated app is justified, custom integrations are discussed on the Enterprise plan.

FAQ

Is a mobile app better than a mobile website for sales?

Not by default. An app can increase repeat purchases among loyal customers who install it, but most visitors never will. For most small stores, a fast mobile website reaches more people and converts better for the money.

How much does it cost to maintain a mobile app?

A common rule of thumb is 15% to 20% of the build cost every year. That covers updates for new iOS and Android versions, bug fixes, store requirements and small improvements. Features you add later cost extra.

Do Apple and Google take a cut of my sales in an app?

For digital goods and subscriptions sold inside the app, generally yes, between 15% and 30% depending on the program and your revenue. Physical products can usually be paid with a regular payment provider. The rules change over time and by country, so check the current policies before you plan pricing.