What it costs to build a mobile app

Mobile apps look simple from the outside, a few screens on a phone, so they get underpriced. The cost of a mobile app comes from factors that web software never deals with: the platform decision, the app stores, the sheer number of devices to test, and the fact that the platforms keep changing. This page applies the software development cost drivers to mobile specifically.

The platform choice comes first

The first cost decision on a mobile app is how many platforms you support and how. You can build one shared codebase that runs on both iOS and Android, or two separate native apps, one for each. A shared codebase usually costs less to build and maintain, because there is one thing to write instead of two. Two native apps cost more but give you the most control and the best fit to each platform.

There is no universally right answer. It depends on how much your app relies on features specific to each platform and how much performance and polish matter for your product. Getting this decision right early has a real effect on cost, because switching later is expensive. Our piece on how to build mobile apps in a dynamic environment covers the trade-offs.

The app stores add cost and time

Web software can be released whenever you are ready. Mobile apps go through Apple's and Google's review before they reach users, and that review has rules you have to meet. This adds time to every release and occasionally sends you back to fix something a reviewer flagged. It also shapes what you can build, because some things the stores simply do not allow.

None of this is a reason to avoid mobile. It is a reason to budget for it. The app store process is a real part of a mobile timeline, and a team that has released apps through it before, rather than learning the rules while you pay, saves you both. This is where the seniority driver from the what drives software development cost page shows up on mobile.

There is also a subtle cost in release timing. Because a mobile update has to pass review before it reaches users, you cannot fix a serious bug the moment you find it the way you can on the web. You wait for review. This changes how you have to build: more testing before release, because a bad release is slower to undo. That extra care is a real cost, and it is one teams from a web background often miss until their first urgent fix waits in a review queue.

Testing across many devices

A web app runs in a handful of browsers. A mobile app runs on hundreds of different phones, with different screen sizes, different operating system versions, and different amounts of memory. Making sure the app works well across that range is real testing work, and it is a cost that grows with how many devices and versions you choose to support.

You can control this cost by deciding which devices and OS versions actually matter for your users, rather than trying to support every phone ever made. But you cannot skip it, because an app that breaks on a common device loses users fast. A one-star review that says "crashes on my phone" costs you far more than the testing that would have caught it, because it makes the next person leave before they even download.

A mobile app is never finished

The biggest surprise in a mobile budget is that the app is never done. Apple and Google release new operating systems every year, change their rules, and sometimes break things that used to work. Keeping your app running well means updating it regularly, forever. This is an ongoing running cost, not a one-time build cost, and it is easy to forget when you are focused on the launch.

Budget for this from the start. An app you can afford to build but not to maintain will slowly stop working as the platforms change. The hidden costs of software development page covers this kind of ongoing cost in more depth, and it applies even more to mobile.

There is also a design cost specific to mobile that is easy to overlook. A phone screen is small and often used while people are walking or travelling, so a mobile app has to be simpler and clearer than the same product on the web. Fitting a real product into that constraint takes real design work, and skipping it produces an app that technically works and nobody wants to use. Good UX and UI design for mobile is not decoration, it is what makes the product usable at all on a small screen, and it belongs in the budget from the start.

How to budget a mobile app

A mobile app budget has to account for the platform choice, the app store process, testing across devices, and the ongoing cost of keeping up with platform changes. The screens are a small part of it. If you are building a mobile product that has to work reliably at scale, our full product build team has released apps through all of this before. The broader software development cost guide covers the drivers that apply to any build. When you want a real estimate, get in touch and we will price it against your platform choice, your device range, and your reliability needs, not a category average.