Most owners budget carefully for the build and then treat the day of launch as the finish line. It isn't. The app maintenance cost that follows is a real, recurring line in your budget, and it's the one that gets forgotten until something breaks on a Friday afternoon.
This page is about how to plan that line. We won't hand you a percentage to apply, because the honest answer depends on your app. What we can do is show you what drives it and what to check.
Why an app costs money after it's finished
Software doesn't wear out the way a machine does, but the ground under it keeps moving. Three things change whether you touch the app or not.
Phones and operating systems. Every year Apple and Google ship new versions of iOS and Android. Some changes are small. Others deprecate an API your app relies on, or tighten a permission rule so that a feature quietly stops working. Store requirements shift too, and an app that doesn't meet them can't be updated at all.
Everything your app depends on. Open-source libraries get security fixes. Payment providers retire old versions of their interfaces. A mapping, SMS or email service changes its terms. If your app talks to five outside services, that is five things that can change without asking you.
Your servers. The backend needs patching, monitoring, backups and occasional scaling. This part is invisible when it works, which is exactly why it gets underbudgeted. Our DevOps and managed operations work exists mostly for this reason.
The pieces of a maintenance budget
Think of it as separate buckets, because they behave differently.
Keeping it running
Hosting, monitoring, certificate renewals, backups, security patches. This is predictable and mostly flat. If you only fund one bucket, fund this one.
Keeping it compatible
The yearly round of OS updates, library upgrades and store requirement changes. It tends to come in bursts, usually in late summer and autumn when new phone software lands. A good habit is to reserve time for it every year rather than treating it as an emergency each time.
Fixing what users find
Real users do things testers never imagined. Bugs will come in, and some will be urgent. Having a way to reproduce and verify fixes matters, and this is where proper QA and testing pays for itself, since a fix that breaks something else costs you twice.
Improving it
New features, redesigned screens, reports someone asked for. This is not strictly maintenance, and mixing it into the maintenance number is how budgets get muddy. Keep it as a separate decision.
What makes the number go up
A few things reliably push maintenance higher, and it helps to know them before you design the app rather than after.
- Many integrations. Each connection to an outside system is a standing obligation.
- Payments, health or personal data. Compliance and security work doesn't stop at launch, and Canadian privacy rules apply to how you handle it all year.
- Two platforms with separate code. Building native iOS and native Android means doing most upkeep twice. A shared codebase reduces that, though it brings its own trade-offs when a platform feature isn't supported yet.
- No documentation and no automated tests. Cheap at launch, expensive every month after. Anyone who touches the app has to rediscover how it works.
- Heavy traffic or large data. Slow screens and growing databases need tuning over time. We cover that in how to improve application performance.
What we'd choose, and when not to commit
If the app is customer-facing and tied to revenue, we would set up a retainer-style arrangement from day one: a defined block of time for compatibility work and bug fixes, plus monitoring that alerts someone before your customers do. The point isn't to spend more. It's that urgent work at short notice is the most expensive kind.
If the app is a small internal tool used by a handful of staff, a retainer is probably overkill. Pay for an annual check-up, keep the hosting patched, and fix things as they come. Be clear with yourself that this means slower response when something breaks.
And one thing we'd avoid: signing a maintenance agreement with unlimited changes for a flat fee. It sounds safe. In practice it either gets you slow service or a dispute about what counts as a change.
Questions to ask before you sign anything
- What exactly is included after launch, and for how long?
- What's the difference between a bug and a new feature in this contract?
- How fast does someone respond when the app is down, and who is that someone?
- Who owns the code, the accounts and the store listings? You want to hold them.
- What happens at the yearly OS release? Is that planned work or billable surprise?
If the answers are vague, that's information. It's much easier to fix a vague contract before the build than a year after.
Putting it next to the build budget
Maintenance belongs in the same conversation as the original estimate, not after it. Our pieces on how much custom app development costs and on custom software development cost in 2026 cover the build side. Read them together, because a lower build quote that skips tests and documentation often just moves the cost into year two.
If you're about to launch, or you already have an app and no plan for it, look at our application development service or contact us. Tell us what the app connects to and how many people depend on it, and we'll say what we would budget for first.
