Whether it’s social media apps, games, or news, all these apps are offered for free nowadays. For us users, it has become a habit not to pay anything for software on our phones.

Hard to believe: Back in 2009, a proud 77% of apps in the App Store were paid. Today, that number is just 4.9%. Because of this, it is increasingly difficult for developers to find indirect or even invisible ways to finance server costs and their own work. Nevertheless, giants like Snapchat, WhatsApp, Instagram, or Facebook manage to be part of a multi-billion dollar economic empire, even though their download button says “Free”. How does that add up?

In this blog post, we will take a look at the three biggest monetization strategies, their technical hurdles, and why the classic “pay once” model is almost extinct.

In-App Advertising

In-app advertising remains the most well-known and successful method of app monetization. These are ads that users see while using the app. According to Netimperative, this leads to up to a 12% increase in users’ purchase intent. The most common formats are:

• Banner Ads: Small ads, usually at the top or bottom edge of the screen.
• Video Ads: Short clips played before or during use.
• Interstitial Ads: Full-screen ads that often appear during natural pauses (e.g., after completing a level).
• Native Ads: Ads that blend seamlessly into the visual design of the app.

These formats are typically found in social media apps, news apps, and very frequently in gaming apps.

In-App Purchases

In addition to in-app advertising, developers can generate revenue through in-app purchases. This method is especially popular in the gaming sector. The business model behind it is that players can acquire skins, items, or objects. This type of monetization is also often exploited through the “Pay-to-Win” pattern. In this scenario, purchases are offered that give players an unfair advantage over others. Games are often specifically designed to offer helpful (but paid) items at particularly tricky spots. For example, to skip a level or gain more power.

Generally, we distinguish between two categories:

• Consumables: In-game currency (coins/gems), health points, power-ups, or building materials. These can be bought over and over again.
• Non-Consumables: Unlocking hidden levels, new characters, or cosmetic goods like “skins” and outfits. These are purchased only once.

Freemium

With the freemium model (a portmanteau of “free” and “premium”), the basic version of the app is completely free. However, if you want to use additional features, exclusive content, or an ad-free environment, you hit a so-called paywall. The goal is simple: users should get to know and love the app, so they are then willing to invest in the best user experience. The most prominent example of this is Spotify. You can easily use the service for free, but you have to take out a monthly subscription for features like offline listening, unrestricted song selection, and the removal of ads.

Technical Implementation: How Does the Money Get Into the App?

Integrating these monetization models into an app requires some technical groundwork. Fortunately, developers no longer write these systems entirely from scratch; instead, they rely on proven interfaces. For ad integration, so-called SDKs (Software Development Kits) from large ad networks like Google AdMob or Unity Ads are embedded directly into the code. These communicate with the servers in the background and fetch perfectly tailored ads in real-time.

When it comes to in-app purchases and subscriptions, the payment processing doesn’t go through the developer’s private bank account, but always through the secure infrastructure of the respective operating system. Apple provides the StoreKit framework, and Android offers the Google Play Billing API. To ensure everything is secure and fraud is prevented during these transactions, server-side validation is essential. The app’s backend directly asks Apple or Google whether the user’s digital receipt is actually genuine before virtual items or premium features are unlocked in the app.

The Balance Between Profit and User Experience (UX)

The biggest challenge with all these models is the fine line between maximizing revenue and annoying users. A poor user experience (UX) caused by overly aggressive monetization inevitably leads to the app being uninstalled quickly. For example, pop-up full-screen ads or poorly optimized video ads not only consume valuable data volume but can also cause annoying delays and longer loading times due to their size.

If you add too many ad interruptions, paywalls in inappropriate places, or a strong pay-to-win feeling, the trust of the user base is usually completely lost. A smart way out of this dilemma is often so-called Rewarded Video Ads. Here, the user decides for themselves whether they want to watch a commercial and receives an in-app reward as a thank you. To find out exactly where their own target audience’s pain threshold lies, experienced development teams also rely on A/B testing. This helps determine how many ads will be tolerated without people bouncing.

Conclusion: “Free” Always Has a Price

At the end of the day, it becomes clear: no app is truly completely free. Even if we don’t pay a cent when downloading from the App Store, we indirectly co-finance the development and server costs. Be it through our attention to advertising, the purchase of virtual coins, or signing up for a premium subscription. The free-to-play and freemium models have prevailed because they lower the barrier to entry for us users to zero.

For development studios, however, it remains a constant balancing act. Only those who have a firm grip on the complex technology in the background and find a fair balance between monetization and a great user experience will survive on users’ smartphones in the long run. Ultimately, the apps that win are the ones that offer real value without making us feel like walking wallets.

Sources:

Picture is generated with Gemini (Nanobanana)

https://startup-creator.com/blog/app-monetarisierung

https://www.publift.com/de/blog/app-monetization

https://www.adpushup.com/de/blog/game-monetization-model

https://www.devteam.space/blog/how-to-add-ads-to-your-app

https://nirajpaul2.medium.com/storekit-2-0-part-1-dcacd1a1e861

https://developer.android.com/google/play/billing?hl=de