There are a few different things to consider when it comes to the cost to build an app.
Both Apple and the Google Play Store has a developer fee to list your app on their platform. If you charge for your app, the platform will take a percentage of this as well. These fees make up the "Platform fees" and there isn't a way around them. They are also not large fees, which makes app developing accessible to so many people.
The second cost is the build cost.
Building an app is a variable cost. At 100xApps, we focus and specialize in building low-cost (from $5,000-$15,000), high-yield apps, similar to building a website. Technology has changed and gone are the days when simple apps cost six figures to develop. Here is a cost calculator that shows the traditional cost compared to our packages.