Launching a mobile app is not the finish line. For most companies, it is the moment the real costs begin. Mobile app maintenance costs catch product owners off guard because they are fragmented across infrastructure invoices, developer time, store compliance work, and security patching cycles, none of which appear on the original build budget.
This article breaks down each cost category with sourced figures so you can budget accurately and decide whether to keep maintenance in-house or hand it to a dedicated team.
About the Author: 724SOFTWARE is a Vietnam-based engineering company with delivery experience across 10+ countries and a client base spanning Fintech, Digital Healthcare, and SaaS products. The team has maintained and scaled live mobile apps, including high-traffic platforms handling concurrent spikes of millions of users.
TL;DR
The industry benchmark for annual mobile app maintenance is 15-20% of the original development cost, rising to 30-40% for complex multi-platform apps.
The four biggest cost drivers after launch are backend infrastructure, OS compatibility work, app store compliance, and security patching.
Approximately 70-80% of mobile apps fail or are abandoned post-launch, often because maintenance costs were not planned for.
In-house maintenance gives you control but carries high fixed overhead; outsourced maintenance reduces that overhead but requires clear SLAs.
A mid-size app typically costs $20,000 to $80,000 per year to maintain.
What Does "Mobile App Maintenance Cost" Actually Include?
Mobile app maintenance is the ongoing work required to keep a live app functioning correctly, securely, and within platform policies after it has shipped to users. It is not a single line item. It is a collection of recurring obligations that span engineering, infrastructure, legal compliance, and security.
The common misconception is that maintenance means fixing bugs. In practice, it covers four distinct categories, each with its own cost structure and cadence:
Backend infrastructure and server running costs
Annual OS compatibility updates
App store compliance and developer account fees
Security patching and dependency management
Understanding each category separately is the only way to produce a reliable budget.
How Much Do Servers and Infrastructure Cost After Launch?
Backend infrastructure is the most predictable recurring cost, yet it still surprises teams who scoped only the build.
Cloud providers like AWS, Google Cloud, and Azure typically charge $300 to $800 per month for startups or simple apps. For mid-market apps with higher user volumes, costs scale to $1,000 to $2,000 per month. That is $3,600 to $24,000 per year before a single engineer touches the codebase.
These figures climb further when you add:
CDN and storage fees for media-heavy apps
Database scaling costs during traffic peaks
Monitoring and alerting tools (crash reporting, log aggregation, uptime monitoring)
Backup and disaster recovery storage
A useful analogy: server infrastructure works like a water utility bill. The base rate is predictable, but usage spikes, such as a product launch or a viral moment, appear only on next month's invoice as unexpected overages. Planning for average usage without a headroom buffer is how teams get caught short.
What Does Annual OS Compatibility Work Actually Cost?
Both iOS and Android release major operating system updates annually. Android is now shifting its major release to the second quarter each year, starting from 2025, which gives developers a shorter preparation window than the traditional fall cycle.
Developers typically have a few months to test against developer previews and beta SDKs before public rollout. Missing this window has consequences: apps that fail to update may be delisted from stores, crash on new OS versions, or break integrations with device APIs.
The practical cost per major OS release runs roughly $500 to $2,000 for straightforward updates. For apps with deep device API usage (camera, biometrics, NFC, push notifications), the figure is higher. A native iOS and Android app maintained separately doubles this work compared to a cross-platform codebase.
Industry sources estimate annual maintenance at 15-20% of the original development cost, which serves as a sanity-check number when OS update costs feel disproportionately high. For complex multi-platform native apps, that benchmark rises to 30-40%.
What App Store Compliance Costs Are Easy to Miss?
App store compliance is the cost category that most product managers underestimate because it feels administrative, not technical. It is both.
Documented rejection rates:
Apple's App Store rejects roughly 35% of first submissions, commonly for completeness or performance issues.
Google Play rejects apps most often for crashes, permission abuse, and battery drain.
Review timelines range from a few hours to 7 days, but a rejection can push an update cycle back by weeks.
Recurring compliance obligations include:
Apple Developer Program fee: $99 per year
Google Play Developer account: $25 one-time registration, but Play Store policies change frequently and require ongoing attention
Privacy label updates (App Privacy labels on iOS, Data Safety section on Google Play) every time data handling changes
SDK and third-party library updates triggered by new store policy enforcement
A single rejected update does not just cost review time. It delays bug fixes and security patches that users are waiting for, creating compounding risk.
How Serious Is the Security Patching Obligation?
This is the category where deferred maintenance carries the most measurable risk.
Industry data shows that 95% of mobile apps contain at least one security vulnerability, and mobile data breaches cost organizations an average of $4.88 million. The average time to remediate a critical vulnerability is 74 days, which already lags behind the average time to exploit of 44 days. A team that patches quarterly, rather than continuously, is operating with a structural gap.
Security patching for a live mobile app includes:
Updating third-party dependencies and SDKs when vulnerabilities are disclosed
Responding to OS-level security patches that require app-side changes
Penetration testing after significant feature releases
Monitoring for anomalous behavior in authentication or payment flows
For companies in Fintech or Digital Healthcare, this is not optional. ISO 27001:2022 and SOC 2 Type II certification frameworks specifically require documented vulnerability management processes with defined response timelines.
In-House vs. Outsourced Maintenance: What Are the Real Trade-offs?
Building on the cost categories above, the harder question is who should own this work.
Factor | In-House Team | Outsourced Maintenance
|
|---|---|---|
Fixed overhead | High (salaries, benefits, tooling) | Lower (retainer or time-and-materials) |
Response time | Depends on team size and on-call structure | Contractually defined SLA (e.g., <10 min incident response) |
OS update readiness | Requires proactive planning | Handled within retainer scope |
Security patching | Requires dedicated security expertise | Covered by specialist team |
Scale flexibility | Slow to ramp up or down | Can scale engineers in 2-4 weeks |
Knowledge retention | High if team is stable | Depends on documentation and handover quality |
The in-house model makes sense when maintenance volume is high enough to keep engineers fully occupied, and when the product roadmap requires deep institutional knowledge. The outsourced model makes sense when maintenance is intermittent, when security and compliance expertise is needed but does not justify a full-time hire, or when the engineering budget would be better directed at new features.
A mid-size app running $20,000 to $80,000 per year in maintenance costs is often cheaper to support through a dedicated offshore team than through equivalent in-house capacity in Singapore, Australia, or the US.
Frequently Asked Questions
What is the standard benchmark for mobile app maintenance costs?
The industry standard is 15-20% of the original development cost per year. For complex multi-platform native apps, this rises to 30-40% annually.
How much does a mid-size app cost to maintain per year?
Ongoing maintenance for a mid-size app typically ranges from $20,000 to $80,000 per year, depending on platform count and integration depth.
Why do so many apps fail after launch?
Approximately 70-80% of mobile apps are abandoned shortly after launch. Documented reasons include poor usability, performance issues, and the high ongoing costs of maintenance that teams did not budget for.
How often do I need to update my app for OS compatibility?
Both iOS and Android release major OS updates annually. You should begin testing against developer betas months before public release to avoid being caught by breaking changes.
What happens if I skip app store compliance updates?
Apps that fall out of compliance risk rejection during the next update submission, forced removal from the store, or reduced visibility through store ranking penalties.
Is security patching really that urgent?
Yes. The average time to exploit a known vulnerability is 44 days, while the average time to remediate is 74 days. Any gap in your patching cycle is a window that is statistically likely to be exploited before you close it.
When does outsourcing maintenance make more financial sense than in-house?
When your app requires less than one full-time engineer's attention month-to-month, or when security and compliance expertise would require specialist hires, outsourced maintenance to a team with defined SLAs and the right certifications typically costs less and carries lower risk.
About 724SOFTWARE
724SOFTWARE is a Vietnam-based engineering company supporting clients across Singapore, Australia, the United States, the United Kingdom, and the broader APAC region, with 200+ professionals of whom 58% hold senior-level expertise. The company operates as a long-term technology partner for SaaS companies and enterprises, providing dedicated mobile app maintenance teams that can scale from 1 to 50+ pre-vetted engineers within 2-4 weeks. With ISO 9001, ISO 27001:2022, SOC 2 Type II, and GDPR compliance in place, and a guaranteed incident response time under 10 minutes, 724SOFTWARE supports clients who need more than a one-off fix, they need a team that operates their product alongside them. A 95% client retention rate reflects what that looks like in practice.
If your post-launch maintenance costs are higher than your original budget assumed, or if OS updates and security patching are falling to whoever has spare time, it is worth having a structured conversation about what a dedicated maintenance retainer actually covers.
Reach out to 724SOFTWARE at https://724software.com.vn/ to discuss what ongoing support for your mobile app looks like in practice.
