App Maintenance and Updates: Costs After Launch

Building an app costs between €15,000 and €80,000. But the number that catches most business owners off guard is the one that comes after: annual maintenance typically runs 15–20% of the original build cost. For a €30,000 app, that's €4,500 to €6,000 per year — every year — just to keep it running. New features are extra.

Most SMBs don't budget for maintenance when they commission an app development project. This article breaks down exactly where that money goes, what you should expect at each support tier, and how to avoid overpaying.

What app maintenance actually includes

"Maintenance" sounds like the occasional oil change. In practice, it's an ongoing process with at least seven distinct responsibilities.

OS compatibility updates. Apple ships a new iOS version every September. Your app needs to be tested and updated within weeks, or it crashes on new devices or loses access to deprecated APIs. Android releases are more gradual, but fragmentation — hundreds of phone models running different OS versions and screen sizes — creates its own set of challenges.

Security patches. Your app runs on frameworks, libraries, and dependencies that receive constant updates. One unpatched vulnerability (CVE) can expose user data. Regular patching isn't optional — it's baseline hygiene. Our security checklist covers the fundamentals that apply to apps as much as websites.

Bug fixes. No app launches bug-free. Real users discover edge cases that test scenarios miss. A form that crashes on a particular emoji, a screen that doesn't render properly on iPhone SE, a loading indicator that spins forever on weak Wi-Fi — these problems only surface in production.

Performance monitoring. Server uptime, crash rates, load times — you need tooling that flags anomalies and someone who responds to them. Not next week. The same day.

Server and hosting costs. Cloud infrastructure (AWS, Google Cloud, Azure) runs anywhere from €50 to €500 per month, depending on user count, data storage, and server load.

Third-party API changes. Stripe, Google Maps, payment processors, Firebase — when they update their APIs, your code needs to follow. Sometimes it's a minor adjustment. Sometimes it's a full re-implementation of an integration.

App Store compliance. Apple and Google regularly change their app review guidelines. Privacy requirements get stricter, new permission rules get introduced. If your app doesn't keep up, you risk removal from the store.

Cost breakdown — three maintenance tiers

Not every business needs the same level of maintenance. Most agencies work with a tiered structure:

The right tier depends on how critical the app is to your business. An internal scheduling app used by ten employees can get by on basic monitoring. A consumer-facing app that generates revenue needs full coverage.

For a complete overview of initial build costs, read about the full app development process from start to finish.

The hidden costs agencies don't mention

Your maintenance contract doesn't cover everything. On top of that monthly invoice, you'll pay a range of fixed and variable costs that don't appear in any proposal:

• Apple Developer Program: €99/year — required to stay in the App Store
• Google Play Developer: €25 one-time
• Push notification service (Firebase, OneSignal): €0–€100/month depending on volume
• Analytics tools (Mixpanel, Amplitude): €0–€300/month
• SSL certificates: usually included with hosting, but custom domains add cost
• CDN for media-heavy apps: €20–€200/month
• Error tracking (Sentry, Crashlytics): €0–€80/month
• Automated testing infrastructure (CI/CD): €0–€200/month

Total hidden costs: €200 to €1,000 per month on top of your maintenance contract. For a €30,000 app, your total annual maintenance bill can reach €8,000–€18,000 if you want comprehensive coverage.

iOS vs Android — maintenance differences

Your platform choice affects not just build costs, but what you pay every year after launch. If you're still weighing the options, our PWA vs native app comparison covers how maintenance overhead factors into the decision.

iOS. Apple has an aggressive deprecation cycle. After a new iOS release, you have roughly 12 months before supporting the previous version becomes impractical. SwiftUI evolves fast — last year's best practices can become this year's legacy patterns. TestFlight makes beta testing straightforward, but the App Store review process can reject updates for policy violations that didn't exist when you submitted the previous version.

Android. Fragmentation is the primary challenge. Hundreds of screen sizes, OS versions (some devices still run Android 10), and manufacturer-specific modifications. Kotlin and Jetpack Compose receive regular updates. Google Play approves updates faster than Apple, but their policies around permissions and data handling shift unpredictably.

Cross-platform (React Native/Flutter). One codebase, one update cycle — that saves time and money. But updates to the framework itself can require code changes. And if the framework has a bug, it hits both platforms simultaneously. You're also dependent on how quickly the framework supports new OS features.

When to update vs when to rebuild

Not every problem gets solved with a patch. Sometimes rebuilding is cheaper than continuing to tape things together.

Update when:

• The app works as intended
• The tech stack is still actively supported
• Changes are incremental and well-scoped
• The architecture can accommodate what you need

Rebuild when:

• The tech stack is deprecated (Objective-C to Swift, Java to Kotlin)
• The core architecture blocks new functionality
• Performance is fundamentally limited and can't be improved with patches
• You're spending more time on workarounds than on actual improvements

Rule of thumb: apps built 3 to 5 years ago on older frameworks are rebuild candidates. After two years of intensive patching, rebuilding is often cheaper than continuing on the old foundation. In that case, consider whether custom software might be a better long-term solution.

Choosing a maintenance partner — what to look for

The cheapest option is rarely the best one. Focus on these five factors:

SLA comparison. What's the guaranteed response time? A solid contract specifies: critical (server outage, data loss) within 4 hours, high (functionality broken for many users) within 24 hours, normal (cosmetic issues, minor bugs) within 48 hours.

Uptime guarantees. The difference between 99.5% and 99.9% uptime sounds small, but 99.5% allows 43 hours of downtime per year. 99.9% allows just 8.7 hours. For a revenue-generating app, that gap matters.

Included hours. How many hours per month are in the contract? 8, 16, or 40? And what does an extra hour cost outside the bundle?

Continuity. Is the original development team available for maintenance? Handing off to a new team costs time and increases the risk of introduced bugs.

Proactive vs reactive. Does the partner suggest improvements, or do you only hear from them when something breaks? A proactive partner saves you more over the long term than they cost.

Also read our guide on custom software vs off-the-shelf solutions to understand when custom maintenance pays for itself.

Reducing maintenance costs

You have more control over your maintenance costs than you might think — provided you make the right decisions before and during the build.

• Choose the right tech stack. Modern, widely supported frameworks (Swift/SwiftUI, Kotlin, React Native, Flutter) reduce maintenance costs structurally. Outdated or niche technology is more expensive to maintain and makes it harder to find developers.
• Write clean, documented code from day one. Undocumented code takes a new developer twice as long to understand — and you pay for that time.
• Invest in automated testing. Automated tests catch bugs before users do. That's fewer emergency patches and less firefighting.
• Set up CI/CD pipelines. Automated deployment reduces manual work and prevents human error during releases.
• Monitor proactively. Catching small problems early costs a fraction of what those same problems cost once they escalate into outages or user complaints.
• Consider a PWA for simpler use cases. A Progressive Web App requires less maintenance than a native app and doesn't need App Store review. Not suitable for everything, but for information and portal apps, it's a serious alternative.

Red flags — signs you're overpaying

Not every maintenance provider delivers value for money. Watch for these signals:

• Monthly cost exceeds 2% of the build cost without any new feature development
• Slow response times despite SLA promises — measure this actively
• Every small change is a "change request" billed outside scope
• No proactive communication — you only hear from them when something breaks
• No access to your own codebase or deployment pipeline — this is a serious risk. Your code belongs to you, not to the agency

Maintenance as an investment, not a cost centre

The apps that last longest and generate the most value aren't the ones launched with the most features. They're the ones that get consistently updated based on user data, security requirements, and platform changes after launch.

Looking for a partner for app development who stays with you after launch? Or do you want to bring existing custom software under professional maintenance? Start with a conversation about what your app actually needs — not about what an agency wants to sell.