What is the difference between an iOS architecture audit and a code review?

A code review examines individual functions, method names, and line-level implementation details. An architecture audit examines structural patterns: how the data layer is organised, how concurrency is managed, how the app handles App Store compliance requirements, and whether the dependency surface is maintainable. Architecture audits identify problems that code reviews miss — and they are completed faster because they do not require reading every line.

How much does an iOS architecture audit cost?

Architecture Audit pricing is €1,440 fixed. This includes the full written recommendations report delivered in 5 business days. There are no hourly tracking requirements and no scope overruns.

What does the audit deliverable look like?

A written recommendations report that identifies structural issues in the five audit categories, explains the technical risk each issue carries, and provides a prioritised remediation path. The report is structured for both technical readers (developers who will implement changes) and non-technical stakeholders (founders, CTOs) who need to understand the risk profile.

Does the architecture audit include fixes?

The audit delivers analysis and recommendations — not code changes. If you want the identified issues remediated, that is a separate engagement scoped after the audit is complete. Some clients do the audit and implement changes themselves. Others use it as a roadmap for a longer engagement.

How long does the audit take?

5 business days from repository access to written report delivery. The codebase review and analysis happen during that period — you do not need to be available throughout. A short handover call at the start and a findings presentation at the end are the only required touchpoints.

iOS Architecture

What Does an iOS App Architecture Audit Actually Deliver?

An iOS architecture audit examines five areas of a production codebase — data layer and persistence, concurrency and actor isolation, privacy and App Store compliance, SwiftUI architecture, and dependency surface — and delivers a written recommendations report in 5 business days. This article explains what the audit covers, what it does not cover, and when it is the right move.

By Ehsan Azish · 3NSOFTS·May 2026·9 min read

The Problem an Audit Is Hired to Solve

An iOS architecture audit is typically engaged in one of four scenarios:

Before a major release or fundraising milestone. Technical debt that is invisible in day-to-day development becomes visible when due diligence happens or when a new feature touches something fragile. An audit before that moment converts an unknown risk to a known, documented one.

After a rebuild or acquisition. Code acquired through an acquisition or delivered by a previous agency has no known quality baseline. An audit establishes the baseline before the new team extends it.

When velocity has collapsed. Features that used to take a week now take a month. Nothing is explicitly broken, but everything is harder than it should be. This is architectural debt becoming a velocity tax. The audit identifies where the structural causes are.

Before scaling the engineering team. Bringing on two or three new engineers into an undocumented codebase spreads the architectural patterns — good and bad — to every new feature. An audit before the team scales documents what is worth preserving and what should change before it becomes the inherited norm.

What an Audit Is Not

Not a line-by-line code review. An architecture audit does not examine every method for correctness or evaluate variable naming. It examines structural patterns. How is state managed? Where does data flow? What is the persistence strategy?

Not a rewrite recommendation. The output of an audit is not “rewrite everything.” It is a prioritised list of structural issues with an impact assessment and a remediation path. Some findings are one-day fixes. Others are multi-sprint structural changes. The audit tells you which is which.

Not performance profiling. Slow network calls, animation frame drops, and memory pressure are performance problems analysed with Instruments. An architecture audit does not include profiling. If performance is the primary concern, profiling is the right engagement.

Not an App Store pre-submission review. An architecture audit includes an App Store compliance review as one of its five scope areas — but it is not the sole purpose. If your app is blocked on a specific App Store rejection, a targeted compliance review is a faster and cheaper engagement.

Scope Examined

The audit covers five structural areas of the codebase:

1. Data Layer and Persistence

How is data stored, fetched, and updated? Common issues found in production codebases:

Core Data context management: view context used for background writes, causing main thread stalls
Missing merge policies causing silent data loss on concurrent writes
No CloudKit schema mirror, meaning sync is unreliable or impossible to test
SwiftData @Query bindings that trigger unnecessary re-renders on unrelated property changes
Missing migration plans for model changes, creating upgrade crashes for existing users

2. Concurrency and Actor Isolation

Swift 6 makes actor isolation a compile-time requirement. Codebases built before Swift 6 migration often have:

@MainActor used on the wrong types, causing unnecessary main thread blocking
Task.detached calls without structured lifetime management, creating memory leaks
DispatchQueue.main.async patterns that should be await MainActor.run in Swift concurrency
Sendable conformance violations that produce data race warnings suppressed with @preconcurrency

3. Privacy and App Store Compliance

Privacy requirements for the App Store have expanded significantly in iOS 17–18:

Privacy manifest (PrivacyInfo.xcprivacy) presence and completeness
NSPrivacyAccessedAPITypes declared for all accessed system API categories
NSUsageDescription keys present for all permission prompts
Third-party SDK privacy manifests merged and present in the app submission package
HealthKit and CloudKit entitlements correctly declared and matching provisioning profile

4. SwiftUI Architecture

SwiftUI codebases that were not built with a coherent architecture pattern develop predictable failure modes:

View models doing network calls directly, making testing impossible
@EnvironmentObject used for data that should be local to a view subtree
@StateObject instantiated in parent views instead of owned by the view that needs them
Navigation logic embedded in views instead of managed by a coordinator
Missing @MainActor annotation on view models that update published state

5. Dependency Surface

What third-party libraries does the app depend on? Common issues:

Unmaintained packages with no activity in 12+ months
Dependencies that have been superseded by native iOS APIs (Alamofire in a codebase that could use URLSession async/await; Kingfisher in an app that could use AsyncImage)
Packages that require the App Transport Security exception, expanding the network attack surface
Analytics or crash reporting SDKs that include ad-tracking components, affecting App Tracking Transparency requirements

What the Output Looks Like

The deliverable is a written report with:

Executive summary — the top three structural risks, plain-language explanation of what each means for the product and team.

Findings by category — one section per audit area. Each finding includes:

What was observed
What the technical risk is (data loss? App Store rejection? performance regression? new feature friction?)
Recommended remediation and its estimated scope (hours, days, or sprints)

Prioritised remediation roadmap — all findings ranked by impact and implementation cost. The roadmap is structured to make the highest-impact/lowest-cost changes first.

The report is structured for two audiences: developers who will implement the changes, and founders or CTOs who need to understand the risk profile without reading every technical detail.

When an Audit Is the Right Move

An audit is the right engagement when:

You have a codebase of unknown quality and need a documented baseline
You are about to bring on new engineers and want structural issues documented before they become the inherited pattern
You have a feature or release coming up that exposes the codebase to scrutiny (investor due diligence, a major product launch)
The team's velocity has declined and you need to understand why

An audit is not the right engagement when:

The app is pre-prototype — there is nothing structural to audit
You have a specific, identified performance problem — use Instruments profiling
You have a specific App Store rejection — a targeted compliance review is faster
You want a development team — an audit produces a report, not code

What Happens After the Audit

The report is yours. You can:

Share it with your engineering team as a remediation backlog
Share it with your investors or board as a technical due diligence document
Use it as the brief for a development engagement to fix the identified issues
Archive it as a baseline and return for a follow-up audit after fixes are implemented

If you want the identified issues remediated, that is a separate engagement scoped against the specific findings. The audit report makes that scope conversation precise — both sides know exactly what is being fixed and what the structural goal is.

Architecture Audit: Pricing and Process

Price: €1,440 fixed
Delivery: Written recommendations report in 5 business days
Process: Repository access, handover call, analysis, findings presentation, written report

The fixed price means no hourly tracking, no scope creep, and no invoice surprises. The 5-day delivery means you have a documented baseline within a week of engagement.