Mobile app code audit

A code audit for the app you already have.

RapidLabs reviews the codebase, dependencies, release path, crash data and store position of an existing iOS or Android app, then hands you a prioritized recovery plan instead of a list of warnings.

Best fit

Use this when...

Your app is live but reviews mention crashes, login problems, slowness, or broken updates.
A previous developer or agency left behind a codebase nobody trusts.
You need to decide whether to fix, rebuild, relaunch, or pause the mobile app.
A founder, SaaS team, or agency needs an independent senior mobile assessment before committing more budget.

Scope

What RapidLabs delivers

Technical review of architecture, dependencies, release process, and code risks when access is available.
Store readiness check against the current Apple and Google submission requirements and target API deadlines.
Crash, ANR, performance, and analytics review read against the thresholds Google publishes.
App Store and Play Store listing and public review signal scan.
Prioritized top risks and recommended fixes, sorted by business urgency.
30-day recovery plan with a suggested audit-to-sprint or audit-to-retainer path.

Clear next step

Email RapidLabs with the app link, the main business risk, and whether you can provide codebase or app store access for the audit.

If it is not a fit, RapidLabs will say so early and point you toward a better path.

Request a mobile app code audit

The report

What do you actually get from a code audit?

You get a written document that names what's wrong with the app, puts the problems in the order they're likely to cost you money, and attaches an effort estimate to each one. That last part is what separates an audit from a tool report. A static analysis run will hand you four hundred warnings sorted by a severity label, and not one of them tells you whether the app can survive the next operating system release.

The audit is built around a decision rather than around a codebase. Almost everyone who asks for one is choosing between four options: keep patching the app they have, rebuild it, hand it to somebody new, or stop spending on it entirely. Organising the findings around that choice means the report arrives with a recommendation attached, instead of a neutral catalogue that leaves you exactly where you started with a longer vocabulary.

It covers the architecture and how much of it is still holding up, the dependencies and how far behind they've drifted, the release process and whether anybody can actually ship, and the store presence including what your reviews are saying that your analytics never mention. Where crash reporting exists, the real failure data goes in as well, because the crashes users are hitting this week outrank anything an engineer finds unattractive about the code.

The plan that follows is sequenced rather than listed, so the first week removes whatever is blocking a release and the remaining weeks work down from there. A report nobody can act on is just a slower way of staying stuck, which is why the plan names the specific first fix instead of recommending a general direction and wishing you luck with it.

The mobile difference

What does a mobile code audit check that a general one doesn't?

It checks the things that can stop a mobile app from shipping without a single line of code being wrong: the platform deadlines, the version of the tooling your build machine runs, the signing setup, and the failure rates the stores measure on your behalf. An auditor whose work is mostly web and backend systems has no reason to look at any of that, and an app can fail every one of those checks while the code itself reads perfectly well.

What Google Play requires and measures

From 31 August 2026, new apps and app updates for phones and tablets have to target Android 16, which is API level 36, or higher. Wear OS and Android Automotive apps have to reach API level 35 by the same date, while Android TV and Android XR apps have to reach API level 34. An app already on the store also needs to target at least API level 35 to keep being offered to new users whose phones run a newer version of Android than the app targets, so missing that one shows up as a slow decline in installs rather than as an outage anybody reports. Google will accept extension requests up to 1 November 2026, with the forms appearing in Play Console later this year, and what actually breaks when you move to API 36 is worth reading before you plan the work.

Google measures stability directly as well, and treats it as an input to how findable your app is. An app crosses the overall bad behaviour threshold when at least 1.09 percent of its daily active users hit a user-perceived crash across all device models, and the equivalent line for app-not-responding errors sits at 0.47 percent. A looser limit of 8 percent applies to any single device model, and crossing that one makes the app harder to find on those specific handsets and can put a warning on the listing itself. The audit reads those numbers before it reads the code, because they decide how urgent everything else is.

What Apple requires

Since 28 April 2026, anything uploaded to App Store Connect has to be built with Xcode 26 or later against an SDK for iOS 26, iPadOS 26, tvOS 26, visionOS 26 or watchOS 26. A project sitting on older tooling can't ship an update at all until that gets sorted out, and teams usually discover it while trying to push an urgent fix. Since 1 May 2024 an app also has to declare approved reasons for certain APIs it uses, including the ones buried inside third-party libraries nobody on your team wrote, and inherited apps carrying old analytics and advertising components fail there regularly. Updated age rating answers were due by 31 January 2026 for submissions to keep going through, which is one of several reasons an App Store submission gets rejected that have nothing to do with your code.

Every figure in this section was checked against Apple's and Google's live documentation on 11 August 2026. Both companies move their own deadlines on their own schedule, so an audit re-checks them at the start of your project rather than trusting a number somebody wrote down earlier in the year.

The access

What access does the audit need to be useful?

It needs read access to the repository, a viewer role in App Store Connect and Play Console, and whatever crash reporting the app already has wired up. That combination covers most of what matters, and none of it involves handing over administrator rights or transferring ownership of anything.

The repository is the obvious one and tells you less on its own than people assume. What reveals the most is whether an engineer who has never opened the project can clone it and produce a signed build on a clean machine. Plenty of inherited apps fail that on the first afternoon, because the build quietly depends on a certificate in a departed developer's keychain or on a configuration file that never made it into version control. Discovering that is a result rather than a delay, since nothing else about the app can be verified until it's solved.

Store access matters because a good share of the risk lives there rather than in the code. The review history shows whether releases have been getting rejected and for what reasons. The account itself shows who genuinely owns the app, which occasionally turns out to be an agency rather than the person paying for the audit. Crash reporting, whether that's Firebase Crashlytics, Sentry, the Xcode Organizer or Android vitals inside Play Console, supplies the failure data that sets the order of the fix list.

When source access isn't available yet, which is normal while a handover is still being negotiated, the audit runs on what can be reached from outside the codebase: the store listing and its update history, the public reviews, how the shipped app behaves on real devices, and the libraries the binary is carrying. That version costs less and answers fewer questions, and it's usually enough to decide whether the full assessment is worth buying at all.

The price

What does a code audit cost and how long does it take?

A RapidLabs audit starts from $1,000 and takes three to five business days once access is working. Access moves the calendar more than the engineering does, so the clock effectively starts when the repository permissions and store roles are usable rather than when the paperwork is signed.

What moves the price is how much surface the app has rather than how many lines it contains. One platform or two, how many outside services it depends on, whether the build works, and whether any crash reporting exists to read all change the amount of senior time involved. An app with payments, background sync, push notifications and eight external libraries takes real days to assess properly, while a single-platform app with four dependencies does not, and quoting both the same way would be dishonest to one of them.

Published prices from other small development shops sit in a wide band, running from around $599 for a two or three page summary produced inside a day, up to roughly $2,500 for a longer illustrated report, with at least one shop pricing by volume at $1,499 for about fifty thousand lines of code. Those figures were checked on 11 August 2026. Pricing an audit by lines of code is a habit borrowed from web work, and it reads a mobile app badly, because the risk concentrates in the platform surface and the dependency list rather than in how much code somebody happened to write.

RapidLabs won't quote a fixed price for the work that follows the audit before the audit exists. A number produced before anyone has opened the codebase is either padded to cover the unknown or too low to finish the job, and both of those cost you more than a scoping conversation does. If you're building a budget rather than buying today, what app maintenance costs per year is the more useful number to start from.

The honest version

When is a code audit the wrong thing to buy?

A code audit is the wrong purchase when you already know what's broken. A team that can name its three worst crashes and point at the release that introduced them doesn't need a written diagnosis of the obvious, and buying one delays the fix by a week. That situation calls for mobile app stabilization instead, where the same money buys engineering rather than analysis.

An ownership problem also outranks a quality problem. If the store account sits with an agency you've stopped paying, or the signing certificates live in a mailbox nobody can open any more, the state of the code barely matters because you can't ship a fix to a single user regardless of how good it is. Sorting that out through an app takeover comes first, and the review that matters there is about accounts and access rather than architecture.

Some questions an audit simply can't answer honestly, and saying so is more useful than selling around them. It won't tell you what a rebuild will cost to the dollar, because that depends on scope decisions you haven't made yet. It won't predict whether Apple or Google will approve your next submission, since both run their own review on their own schedule, and any firm promising you an approval date is guessing in a confident voice. It also can't tell you whether your users will prefer the result, which is a research question rather than an engineering one.

What the audit does settle is whether the app you already have is worth continuing with, and that's the question most people are really paying to resolve. Everything else in the report exists to support that answer, which is why it ends with a recommendation and a first month of work rather than with a summary of how the reviewer felt about the codebase.

Related

Already know the codebase was left behind by a previous developer or agency? Skip ahead to an app takeover audit. If the app is actively crashing or blocked from release, mobile app stabilization can move faster than a full audit. Once you know what's wrong, mobile app maintenance is the ongoing path most audits lead to. When the answer is that you need a team to run the work rather than a list of fixes to hand someone, outsourcing mobile app development sets out what you would be handing over and what has to stay in your name.

Not sure which of those your app needs yet? Talk to a senior engineer about your app and you'll get a straight read on what's actually at risk before anybody quotes you for work.

Mobile app code audit: frequently asked questions

What's the difference between a code audit and a code review?

A code review happens continuously inside a working team, where one engineer reads another's changes before they merge, so it covers a small slice of the product at a time. A code audit is a one-off assessment of an entire codebase by somebody outside the team, and it answers a business question rather than a technical one. The output differs as well, since a review leaves comments on a pull request while an audit leaves a document that names the risks in priority order with effort estimates attached, so you can decide what to fund and in what order.

How much does a mobile app code audit cost?

RapidLabs audits start from $1,000 for an app of ordinary size, and the exact scope gets confirmed after a short look at what the app actually involves. The number moves with how much surface the app has rather than how much code it contains, so two platforms, a long list of third-party services, payments or background sync all push it upward. Published prices elsewhere run from a few hundred dollars for a short written summary up to roughly $2,500 for a longer illustrated report, which mostly reflects how many days of senior time go into it and how much of the result is presentation rather than analysis.

Can you audit an app without access to the source code?

Yes, with a smaller result and a clear boundary around what it covers. Without the repository the audit works from the store listing and its release history, the public reviews, how the shipped app behaves on real devices, and the third-party libraries the binary carries with it. That's normally enough to decide whether a full assessment is worth buying, and it's the usual starting point while a handover is still being negotiated. It can't tell you how the code is organised or how much of it can be salvaged, so it answers the go or no-go question rather than the how question.

Will the audit tell me whether to rewrite the app?

It gives you a recommendation with the reasoning attached, which is more useful than a verdict you have to take on trust. Rewriting earns its cost when the foundation the app sits on has been discontinued, or when the platform requirements have moved so far ahead that catching up takes longer than starting again. Continuing wins more often than people expect, because most apps that feel unsalvageable turn out to have a small number of contained problems surrounded by years of behaviour that works. The report names which of those two your app is, and what the first month of either path would involve.

How long does a code audit take?

Three to five business days for a typical app once access is in place, and the access is usually what sets the real timeline. Waiting on repository permissions, a Play Console invitation or an App Store Connect role routinely costs more calendar days than the assessment itself does. If the app can't be built on a clean machine by an engineer who has never opened it, reproducing the build becomes the first task and the audit reports that as a finding in its own right, because it's a serious problem for anybody who needs to ship an update in a hurry.

Is my code kept confidential during the audit?

Yes, and RapidLabs will sign your non-disclosure agreement before receiving any access rather than afterwards. Repository access is requested at read level, store access at the lowest role that still shows the review history, and neither of those needs ownership of anything transferred. If the app belongs to a client of your own and sits under an agreement you signed with them, the audit can be scoped and written so that it stays inside those terms and can be handed to your client directly.

Do you audit Flutter apps as well as native ones?

Yes, and cross-platform apps carry a layer of risk that a native audit never has to think about. The framework version, the plugins that wrap native functionality and the build tooling all run on their own upgrade schedules on top of Apple's and Google's, so an abandoned Flutter app is frequently blocked by a plugin that stopped being maintained rather than by anything the original team wrote. The audit checks that layer explicitly and reports what moving to a supported framework version would actually involve.