Launch is a line item, not a finish line. The six months after a mobile launch cost real money that most founders have not budgeted, and the first time the cost registers is usually three months in, during a sprint that was not supposed to happen.
For a focused iOS or Android app, the first six months of post-launch work usually land between 15 and 25 percent of the original build cost. On a $40k build that is $6,000 to $10,000. On an $80k build it is $12,000 to $20,000. None of it is optional. All of it is predictable.
Here is where the money actually goes, and how we scope it from the first proposal so the number does not surprise anyone.
Why the number exists at all
An app that is just shipped is an app sitting inside a moving environment. iOS and Android each push a major version a year, plus mid-cycle changes. Third-party SDKs — the ones you use for analytics, auth, payments, maps, push, and crash reporting — update independently and sometimes break old integrations. Apple's privacy policy changes faster than any founder can read. Google's Play Store policy enforcement happens post-launch.
The code you wrote on launch day assumed a specific version of all of that. Six months later, every assumption has been nudged. Nothing crashes immediately — but the drift accumulates until a specific update ships that your code was not written against, and something breaks on a user's phone.
That is the baseline tax, and it is the single biggest reason founders forget what comes after launch — nothing feels wrong until it is.
Where the first six months actually go
A rough breakdown for a founder-led app in its first six months, assuming a competent build and no catastrophic bugs:
- Iteration from real user data (30–40%). The flows that broke in beta were obvious. The ones that break in production are not. First real users expose onboarding gaps, data edge cases, support loops. Fixing them is cheaper than acquiring more users to churn through them.
- OS and SDK drift (20–25%). One major iOS release, mid-cycle changes, payment library updates, auth library updates, Firebase or similar backend-SDK increments. Not dramatic; cumulative.
- Bug triage and crash fixes (15–20%). Everything your TestFlight beta missed. Device-specific crashes, race conditions at real volume, timeouts you did not see in simulation.
- App Store policy and metadata (10–15%). Apple App Privacy label reconciliation, Google Data Safety declarations, screenshot refreshes, keyword tuning, responding to any 4.3 or 5.1 flag the store sends.
- Support loop closure (5–10%). The handful of real support tickets that surface a product fix, not a user error. Each one closes a leak that would otherwise cost you three more users.
- Hosting and backend (5–10%). Modest for most apps, meaningful for anything AI-heavy, media-heavy, or syncing a lot of state.
None of these line items is big on its own. Together they are the number you did not budget for.
What usually blows the number up
The 15 to 25 percent range assumes the build was competent. Three patterns inflate it significantly:
No named maintenance owner. When nobody owns releases, Apple's privacy label changes get missed, SDK updates pile up, the app rots quietly. Six months later a single OS release breaks something, and the recovery sprint costs more than six months of light retainer would have.
AI features without a cost cap. If the app calls OpenAI or similar, usage can scale faster than revenue. See predicting your OpenAI bill before launch — if the bill surprises you post-launch, it is almost always because nobody modeled per-user cost.
Compliance drift. For HealthTech or FinTech apps, an annual re-assessment or a vendor BAA change can appear in the first six months and absorb engineering time. Scope it from day one or pay for it on an unplanned timeline.
Retainer versus ad-hoc
For most founder-led mobile apps, a light monthly retainer with named ownership outperforms ad-hoc engagement in the first year. A retainer at 2 to 4 percent of the build cost per month buys crash triage, SDK updates, App Store compliance, a planned release cadence, and someone to escalate to when a store flag lands on a Friday afternoon.
Ad-hoc works when you have an internal engineer who can own releases and triage crashes between sprints. If that engineer is also building the next feature, both will slip. The founders who scope maintenance as a scoped workstream from the first proposal are the ones whose apps still feel healthy at month twelve.
A realistic monthly cadence
We run roughly this cadence on apps we maintain, including MedLogsRx and IngrediCheck:
- Monthly: crash and ANR review, support ticket triage, analytics check, SDK and dependency updates, release notes planning. A half-day cadence.
- Quarterly: deeper pass before major OS beta, policy review, screenshot refresh if positioning has evolved, review of all App Privacy / Data Safety labels against actual SDK behavior.
- Annually: alignment with the new OS cycle (iOS and Android both ship majors around September), a honest look at the data model for drift, and a decision on what features earn investment in year two.
Published that way, the cadence is easy to budget. Not published, it still happens — just in retroactive sprints that cost more.
The cheapest version of post-launch is the one you scoped before launch.
What a serious estimate looks like
A proposal that treats launch as the end of the engagement is a proposal that will cost you more later. A serious estimate names the maintenance owner, the release cadence, the baseline retainer, and the expected planned iteration budget in the same document as the build. It also names the specific first six months of likely work — the next iOS release, the Apple privacy label review, the first Play Console policy enforcement cycle.
If the proposal in front of you does none of those, the number you are looking at is a down payment, not a price. Treat it that way when you compare quotes.
FAQ
How much does a mobile app cost to maintain in its first six months?
For a focused iOS or Android app, expect 15 to 25 percent of the original build cost in the first six months. A $40k build runs roughly $6k–$10k of post-launch work: iteration from real user data, SDK and OS updates, crash and support triage, App Store metadata updates and a modest hosting bill.
What drives post-launch cost in a mobile app?
OS and SDK drift (iOS and Android ship major versions annually plus mid-cycle changes), payment and auth library updates, bug fixes that only surface at real-world volume, support loops, analytics and privacy label reconciliation, and small iteration from early users. None of it is optional; all of it is predictable.
Do founders typically underbudget mobile app maintenance?
Yes. The common pattern is a full build budget followed by nothing for six months, then an urgent sprint when the first iOS release breaks the app or crash reports pile up. Scoping maintenance from day one is cheaper than reacting, and it is a leading indicator of whether the agency has shipped before.
Should maintenance be a monthly retainer or ad-hoc?
For most founder-led mobile apps, a light monthly retainer with named ownership beats ad-hoc. Even a modest retainer buys crash triage, SDK updates and release discipline, which is what keeps the app healthy. Ad-hoc works when internal engineering already owns releases.
How does Eightinity scope the first six months?
We name a maintenance owner, a monthly release cadence, a crash and feedback review, and a planned iteration budget in the same proposal as the build. On MedLogsRx and IngrediCheck we run exactly that cadence, which is why neither has had a surprise down-week in the OS cycle.
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