Do you need to build for both iOS and Android?

Do I need to build for iOS and Android, or will one platform do? The honest answer turns entirely on who your users are: a consumer app almost always needs both, because the public is split across iPhone and Android and skipping either loses a large slice of your audience, while an internal or B2B app for a known group of users may need only the platform those users actually carry. This page helps you work out which situation you are in, and shows why the way you build often makes the question easier than it looks. It is the upstream companion to our iOS or Android first page, which covers ordering once you have decided you are building one platform at a time.

When one platform is genuinely enough

The case for a single platform rests on one condition: you know, and can predict, the devices your users have. Plenty of apps meet that condition. An internal app for staff who are all issued the same company phones only needs to run on those phones. A B2B app for a defined set of client businesses on a known platform only needs that platform. An app for a niche audience that clearly favours one platform can reasonably target just that one. In each case you can say with confidence where your users are, and building the other platform would be paying to reach people who simply are not there.

This is the situation businesses most often overlook, assuming they need both platforms when their actual users sit on one. The test is straightforward: can you confidently state which platform your users are on? If you can, because you control or know their devices, then one build may be all you need, and spending on the second platform adds cost without adding reach. We are happy to tell a business that one platform is enough when that is genuinely the case, because building an app for a platform your users do not use is wasted money, and a clear-eyed look at who will actually open the app is what reveals whether you are in the one-platform camp. The more controlled and known your audience, the more likely a single platform serves you fully.

When you genuinely need both

At the other end sits the consumer app, where you usually do need both platforms, because the general public is split across iPhone and Android in proportions that make ignoring either costly. If your app is aimed at consumers, at the public, at anyone who might walk in off the street, then a meaningful share of your potential users is on each platform, and launching on only one leaves the other half unable to use your app at all. For a business trying to reach a broad market, that is a serious self-imposed limit, and it is why consumer apps are the clearest case for covering both platforms.

The same logic applies, more mildly, to any app whose audience you cannot tightly predict, since uncertainty about where your users are is itself a reason to cover both rather than gamble on one. The question is really about how much control you have over your users' devices: high control, as with internal or B2B apps, points toward possibly one platform, while low control, as with consumer apps, points toward both. Most businesses building for the public fall into the both camp, and the right response is not to agonise over which platform to sacrifice but to look at how to cover both affordably, which is exactly where the way you build comes in. Trying to serve a split public audience from a single platform is a handicap a competitor on both platforms will happily exploit.

Cross-platform usually settles it

The reason the both-or-one question is less daunting than it first appears is that covering both platforms does not have to mean building two apps. If you build cross-platform with Flutter or React Native, a single codebase serves both iOS and Android, so reaching both costs far less than two separate native builds, often only modestly more than building for one platform alone. This changes the economics of the decision entirely, because the main reason to settle for one platform, the cost of the second, largely falls away when one build covers both. Our cross-platform app development page covers how this works.

So for a consumer app that needs both platforms, cross-platform usually makes covering them affordable enough that the choice is easy: you build once and launch on both. The cases for a single native platform shrink to the genuinely controlled audiences, internal apps, known-device B2B, clear niche, where you truly only need one and native may suit. The decision about whether you need both is therefore tightly bound to how you build, and our native versus cross-platform page covers that underlying choice. For most businesses weighing one platform against two, the realisation that cross-platform covers both for not much more than one is what turns a hard-looking question into a simple one.

Putting it together

The way to answer whether you need both platforms is a short chain of questions about your users and your build. First, can you confidently predict your users' devices? If yes, because the audience is internal, B2B or a clear niche, one platform may be enough, and you choose it by following your audience, which our iOS or Android first page covers. If no, because your audience is the public or otherwise uncertain, you need both. Second, given that, how should you build, since cross-platform covers both affordably while two native builds cost more and a single native build covers only one platform?

For most consumer-facing businesses the answer that falls out is both platforms, built cross-platform, because that reaches the whole split audience without the cost of two native apps. For controlled audiences, one platform, possibly native, is the sensible and economical choice. Either way, the decision should rest on who your users are and how you build, not on a default assumption, and getting it right avoids both the waste of building a platform your users do not use and the lost reach of skipping one they do. If you would like help working out whether your app needs one platform or both, and how to build it most economically, tell us who your users are and what you are making, and we will give you a clear recommendation with a fixed-price quote.