How much does it cost to maintain a mobile app in 2026?

Clients ask about the cost of building an app. They rarely ask about the cost of owning one. Those are 2 different questions with 2 different answers, and the second one can be just as hard on the budget as the first.

The standard rule in the industry is that annual mobile app maintenance costs between 15 and 25 percent of the original development budget. On a 40,000 euro project that's 6,000 to 10,000 euros a year, every year, for as long as the app exists. On a 120,000 euro project, it's 18,000 to 30,000 euros a year. Nobody says this clearly at the sales stage. Clients often find out when the first server invoice arrives in their inbox.

What actually goes into "mobile app maintenance"

Maintenance isn't one cost. It's several overlapping layers, each essential, each with its own payment schedule.

Server infrastructure is typically the largest item. A mobile app rarely lives on its own on the device: in the background there's a server, a database, often services for push notifications, file storage, and authentication. That generates a monthly bill on AWS, Google Cloud, or Azure. A simple app with a few hundred active users typically runs 300 to 800 euros a month for infrastructure alone. When the app grows and handles thousands of sessions a day, that cost grows with it.

App store fees are one-off or annual, but unavoidable. Google Play charges 25 USD once, at first publication. The Apple Developer Program is 99 USD a year with no exceptions: don't pay it and your app disappears from the store. Small amounts, but if you're managing several apps, they add up.

OS updates are a line item you can't plan to the month, but you have to account for in the annual budget. Apple releases a major iOS version every year in autumn. Google does the same with Android. Each new system version can deprecate APIs, change permission behaviour, or introduce new requirements for apps. If you don't update the code, you'll get a warning in App Store Connect, and within a few months the app will stop being visible to new users or start crashing on new devices.

Then there are third-party dependencies: libraries, SDKs, integrations with external services. Firebase updates its SDK every few months. Stripe changes its API and requires migration. Google Maps releases new versions that need API key reconfiguration. Each of those changes means developer hours, not because you broke something, but because the ecosystem keeps moving.

iOS vs. Android: different maintenance costs

They're not the same, and it's worth knowing this before choosing a platform.

Apple is stricter about compatibility with current system versions. Since 2024, the App Store requires new app versions to be built using the current Xcode and to support the latest SDK. In practice, if you don't update the app for a year, you may eventually be unable to submit a new version because the development environment has drifted too far. For iOS, keeping code current isn't optional.

Android is more lenient in this respect, but has its own challenge: device fragmentation. The Android ecosystem spans hundreds of different models, from Samsung flagships to budget phones from smaller manufacturers, each potentially running a different OS version with its own manufacturer overlay. Testing on Android takes more time and requires access to a broader range of devices or a paid service like Firebase Test Lab. On a given project, that testing overhead is often 20 to 30 percent more developer time than on iOS.

Cross-platform apps (React Native, Flutter) don't eliminate these costs. They redistribute them. Instead of 2 separate codebases to maintain, you have 1, but you still have to track both stores' requirements, build for both platforms, and test on both.

What drives up maintenance costs

App simplicity is one of the strongest predictors of maintenance cost. The more external system integrations, the more points that can break independently of your own code.

Payments are a good example. Integrating with Stripe or another payment processor isn't just a one-off implementation. Payment processors regularly update their APIs, introduce new security requirements (SCA in Europe, PCI DSS), and deprecate old endpoints. Once every year or two, someone has to go through the changes and make sure the payments module still works to standard. Skip that and you'll face problems with the App Review or with payments themselves.

Push notifications seem simple but require their own infrastructure: APNs (Apple) and FCM (Google) are 2 separate services, certificates expire, device tokens go stale after reinstalling the app. With 10,000 users, managing this is a few hours a month. Not somewhere in the background: someone physically has to stay on top of it.

Media streaming, real-time chat, offline data sync: each of those features means higher infrastructure costs and more complex code to maintain. On one project we ran for an education client, switching from a simple REST API to WebSockets for a chat feature increased the monthly server cost by 60 percent and added several hours a month of connection monitoring.

Approximate ranges for 2026

Below are 3 app types with realistic annual maintenance costs. These aren't price lists, just ranges that reflect real projects.

Simple app: a few screens, REST backend, authentication, a few hundred active users. Infrastructure of 200 to 500 euros a month, OS updates 2 to 3 times a year taking a few developer hours each, monitoring and security. Total: 15,000 to 28,000 euros a year including developer time.

Medium-scale app: payment or external API integrations, a few thousand users, an admin panel. Infrastructure of 600 to 1,500 euros a month, more variables in the third-party ecosystem. Total: 28,000 to 60,000 euros a year.

Complex app: streaming, chat, complex backend logic, a large user base, 2 mobile platforms plus web. Maintenance costs here can easily exceed 80,000 to 120,000 euros a year, especially when you need to keep a small team running.

One note: those are maintenance costs only. Any new feature is a separate project with its own quote.

What gets left out of maintenance budgets but shouldn't

Monitoring and alerts. Someone needs to know the app has gone down before users report it. Sentry, Crashlytics, Datadog: more subscriptions, ranging from a few dozen to a few hundred euros a month depending on volume. No monitoring means savings right up until something breaks and you find out from 1-star reviews on the store.

SSL certificate renewals and API key rotation. Apple push certificates expire. APNs requires renewals. Access keys to external services have limited lifespans. Managing this is a few hours a year, if someone remembers to do it and has a plan.

Data backups. If the app stores user data, you have a legal obligation under GDPR and a business obligation to protect yourself. Nightly database backup, retention for a defined period, test restore every few months. For small databases it's a marginal cost. For large ones it's its own budget line.

One question to ask before signing a contract

Before you sign with any developer, ask one thing: "How much will maintaining this project cost per year?" A good developer will answer specifically or say directly that they need to calculate it from the architecture. If you hear "it depends" with no figures attached, or the topic gets brushed aside, that's a signal: either the developer hasn't thought the project through enough, or the maintenance cost is just being conveniently left out of the pitch.