How much does iOS app development cost?

A simple iOS app (3-5 screens, basic backend, no third-party integrations) costs $15,000-$35,000. A production iOS app with user accounts, push notifications, payments, and a backend API costs $40,000-$100,000. A complex iOS app with real-time features, offline sync, custom animations, or hardware integrations (camera, ARKit, HealthKit) costs $100,000-$250,000. These ranges assume a fixed-price engagement with a dedicated iOS developer and QA tester.

How long does iOS app development take?

A simple iOS app takes 6-10 weeks from signed scope to App Store submission. A mid-complexity production app takes 12-18 weeks. Complex apps with heavy backend, real-time data, or hardware integrations take 20-32 weeks. Apple's App Store review adds 1-3 days after submission. Rejection and revision cycles can add 1-2 weeks. Plan for at least one revision round in your timeline.

How do I choose between native iOS development and cross-platform (React Native or Flutter)?

Choose native Swift if: your app is performance-sensitive (video, AR, gaming, real-time audio), you need deep iOS system integrations (HealthKit, ARKit, Core ML, NFC), or your product is iOS-only and you want access to every Apple API on day zero. Choose React Native or Flutter if: you need iOS and Android simultaneously and budget is constrained, your app is content-driven with standard UI patterns, or your team already has strong JavaScript or Dart skills. Cross-platform apps cover 80-90% of use cases. Native Swift is the right choice for the remaining 10-20% where performance or platform depth matters.

What questions should I ask an iOS development company before hiring?

Ask for the App Store rating and day-30 retention rate for a production app they've shipped. Ask which iOS version their most recent app supports and how they handle deprecations. Ask how they implement ATT consent flows for apps that use ad tracking. Ask for their App Store submission process and how many rejections they typically encounter. Ask how they handle Apple's annual iOS release and whether they've already shipped apps on the latest SDK. Companies that can answer these questions specifically have shipped real iOS apps.

What is the difference between an iOS app development company and an iOS developer marketplace?

An iOS development company owns the full delivery: requirements definition, UI/UX design, iOS development, backend API, QA testing, App Store submission, and post-launch support. They take project responsibility. An iOS developer marketplace connects you with individual iOS developers for hire - you manage the project, integrate the code, handle QA, and submit to the App Store yourself. Companies are better for defined product builds. Marketplaces are better for augmenting an existing iOS team with specialist capacity.

How do I verify an iOS company's shipped App Store apps, and what's a red flag?

Ask for the App Store rating and day-30 retention rate for a production app they've shipped - retention is the number that reveals whether the app actually works, since a rating alone doesn't show whether users kept using it. Ask for three live App Store links, not screenshots. The red flag is a portfolio that shows mockups instead of working links, or links that lead to landing pages rather than App Store listings - verify every app in the portfolio is actually live before engaging.

How do I confirm real Swift and SwiftUI depth instead of surface-level experience, and what's a red flag?

Ask which iOS version their most recent app supports, how they test against beta iOS releases before Apple's annual September update, and how many SwiftUI-first apps - not UIKit apps with a few SwiftUI screens bolted on - they've shipped. Ask them to walk through navigation, state management, and data flow in a full SwiftUI app. The red flag is a company that treats annual iOS updates as a surprise rather than routine, or whose 'SwiftUI experience' turns out to be a couple of screens wrapped around an otherwise UIKit codebase.

What Apple-specific compliance questions should I ask before signing, and what's a red flag?

Ask how they implement ATT consent flows for apps that use advertising or analytics, and confirm they know the difference between IDFA and IDFV - a developer who doesn't hasn't shipped a production app with tracking in the last three years. Also confirm they'll ask about your Apple Developer Program account and code-signing setup in the first conversation. The red flag is a company that skips this question entirely, which usually means they haven't shipped under client accounts before or plan to submit under their own account, an ownership problem you inherit later.

What should I ask about App Store submission and optimization, and what's a red flag?

Ask how many submission attempts their last three projects required, what the most common rejection reasons were, and who handles keyword research and screenshot design before submission. A team that has never hit a rejection either hasn't shipped many apps or isn't being candid. The red flag is a company that considers the job done at code handoff and never raises App Store optimization - the App Store is a search engine, and ignoring ASO leaves a real distribution lever unused.

How do I know if a vendor can actually handle an App Store rejection?

Ask them to walk through the last App Store rejection they received for a client - what the reason was and how they resolved it. Every company that ships iPhone apps receives rejections; Apple's review guidelines are detailed, frequently updated, and interpreted inconsistently across reviewers. A company that has shipped many apps has a library of rejection experiences: a privacy policy that was too vague, a camera permission string that didn't explain the use clearly enough, an in-app purchase flow that didn't meet guideline 3.1.1. A company that says "we've never had a rejection" either hasn't shipped many apps or isn't telling the truth. A company that can walk you through a rejection and resolution has real process.

What should a vendor's iOS-specific QA process actually cover?

iOS has a specific set of failure modes that general software QA does not capture: memory pressure events when iOS terminates background processes, push notification delivery edge cases across iOS permission states, keychain behavior across iOS updates, background refresh reliability, and UI rendering on different iPhone display sizes and refresh rates. Ask specifically what iOS-specific test cases are in their QA plan. A company that describes a generic software testing process rather than an iOS-specific one has not thought through the failure modes that matter for your app.

Updated October 2026

Top iOS app development companies in 2026 (vetted shortlist)

A vetted shortlist of the best iOS app development companies in 2026, evaluated on production iOS apps shipped, Swift/SwiftUI depth, and App Store performance.

Riya Thambiraj

10 min read · Updated Oct 13, 2026

In this article

Short answer

iOS vendor selection depends on production apps shipped to the App Store, real Swift and SwiftUI depth, App Store rating and retention performance, and hands-on experience with Apple's privacy framework requirements. RaftLabs meets that bar with full-delivery iOS builds across hospitality, logistics, and financial services, a 12-week average delivery cycle, and a 4.9/5 Clutch rating across 50+ reviews.

Key takeaways

Swift 5.9+ and SwiftUI are table stakes for any iOS project started in 2026. Companies still defaulting to UIKit for new screens are behind the current Apple developer standard.
App Store ratings matter, but day-30 retention is the metric that separates well-built iOS apps from ones that pass review but fail to hold users. Ask for both.
Apple's privacy framework changes in recent iOS versions require specific implementation experience - ATT consent flows, on-device processing, and App Privacy Nutrition Labels. Verify the company has shipped apps through these changes.
A native iOS app and a cross-platform iOS app (React Native or Flutter) have different performance ceilings. Know which you need before you talk to a vendor.

According to Grand View Research, the Apple App Store segment accounted for 61% of global mobile app market revenue share in 2025. Consumer spending on the App Store reached USD 89.3 billion in 2025, and iOS users spend roughly 2.5 times more on in-app purchases than Android users, making iOS the higher-value platform for most commercial app builds.

Finding a good iOS development company is harder than it looks. Most agencies list iOS as a service. Fewer have shipped a production Swift app through the last two iOS major releases, handled Apple's ATT consent flow, and hit an App Store rating above 4.5. The filter that matters is not "do they build iOS apps" but "can they show you the apps they've shipped and the metrics those apps hit."

The ten iOS app development companies on this list are 303 Software, RaftLabs, Intelivita, Algoworks, Applover, Intuz, Savvy Apps, Livefront, Metova, and MindSea. RaftLabs is on this list. We wrote our own entry with the same directness we applied to everyone else.

How we evaluated this list

We evaluated companies on five criteria:

Criterion	What we looked for
Production iOS apps	At least one live iOS app in the App Store with verifiable ratings
Swift and SwiftUI depth	Experience with Swift 5.9+ and SwiftUI for new UI development
App Store performance	Documented App Store ratings and retention data from shipped apps
Apple platform coverage	Experience with iOS privacy changes, ATT flows, and current SDK
Clutch rating	4.7 or above with mobile or iOS project track record

No company paid for placement on this list.

1. 303 Software

303 Software is a custom software firm in Denver, Colorado, building native and cross-platform iOS and Android apps alongside web applications, with a focus on healthtech and other regulated industries. Founded in 2006, it positions itself around long-term client relationships and states a 95% client-retention rate.

Notable work - 303 Software concentrates on regulated-industry builds where iOS work sits alongside backend and web delivery. The firm reports a 95% client-retention rate, a signal of repeat engagements rather than one-off projects.

Pricing signal - Pricing isn't published; request a scoped quote for your project.

What to watch - 303 Software's healthtech and regulated-industry focus is an advantage if your app carries compliance requirements, and less of a differentiator for a simple consumer app. Confirm its Clutch rating before engaging.

Best for: Businesses building iOS apps in healthtech or other regulated industries that need compliance-aware delivery.
Specialization: Native and cross-platform iOS/Android and web apps for regulated industries
Pricing: Not public - request a scoped quote
Clutch: Profile listed - confirm rating before engaging

2. RaftLabs

RaftLabs has shipped iOS apps for enterprise clients in hospitality, logistics, and financial services. Their iOS app development work covers native Swift apps with SwiftUI interfaces, cross-platform React Native apps for iOS and Android simultaneously, and iOS integrations with AI backends for on-device inference and push-based personalization.

Notable work - RaftLabs' iOS delivery spans hospitality, logistics, and financial services builds, with full delivery ownership - UI/UX design, Swift development, backend API, QA, App Store submission, and post-launch support - inside one team.

Pricing signal - Fixed-price, milestone-based engagements with a 12-week average delivery cycle from kickoff to App Store submission.

What to watch - RaftLabs is built for teams that want end-to-end ownership of an iOS build, including Apple's privacy framework work (ATT consent, App Privacy Nutrition Labels). A team that only needs a senior Swift contractor to slot into an existing project may find a full-delivery engagement more than they need.

Best for: Businesses that need a production iOS app shipped end-to-end with fixed scope and a defined timeline.
Specialization: Native Swift/SwiftUI apps, cross-platform React Native, AI-backend integrations
Pricing: Fixed-price, milestone-based, ~12-week average cycle
Clutch: 4.9/5 (50+ reviews)

3. Intelivita

Intelivita is a mobile app development company based in Ahmedabad, India, with a second office in Oshawa, Canada. It builds mobile apps, websites, and custom software.

Notable work - Intelivita works across mobile, web, and custom software for clients internationally. No specific engagements are independently verified here, so treat portfolio claims as self-reported.

Pricing signal - Pricing isn't publicly disclosed; request a quote.

What to watch - Intelivita is a broad-service offshore shop rather than an iOS specialist, so ask for shipped App Store apps and iOS-specific references. Confirm its rating before engaging.

Best for: Businesses wanting an offshore vendor for mobile, web, and custom software with a defined scope.
Specialization: iOS/Android mobile, websites, and custom software
Pricing: Not publicly disclosed - request a quote
Clutch: Profile listed - confirm rating before engaging

4. Algoworks

Algoworks is a digital-engineering company headquartered in Sunnyvale, California, with delivery teams in India. It builds cross-platform mobile apps using Swift, Flutter, React Native, and .NET MAUI, plus broader platform and product engineering.

Notable work - Algoworks holds partner credentials that speak to its platform coverage - Salesforce Summit Partner, Microsoft Gold Partner, and AWS Advanced Partner - which point to enterprise-integration work alongside its mobile practice.

Pricing signal - Pricing isn't published; request a scoped quote.

What to watch - Algoworks spans several stacks and platform partnerships, so it suits teams that want mobile delivered next to Salesforce, Microsoft, or AWS integration work. A team that only needs a focused native iOS build may not use that breadth. Confirm its Clutch or GoodFirms rating before engaging.

Best for: Businesses that need cross-platform mobile built alongside Salesforce, Microsoft, or AWS platform work.
Specialization: Swift, Flutter, React Native, and .NET MAUI plus platform engineering
Pricing: Not public - request a scoped quote
Clutch: Profiles listed on Clutch and GoodFirms - confirm rating before engaging

5. Applover

Applover is a full-stack digital agency based in Wroclaw, Poland, building native mobile apps in Swift and Kotlin, web apps, and product design for startups and SMBs. It was founded in 2016 and named a Deloitte CEE rising star in 2019.

Notable work - Applover works mostly with startups and SMBs, pairing native mobile and web engineering with in-house product design. It was named a Deloitte CEE rising star in 2019.

Pricing signal - Pricing isn't published; request a scoped quote.

What to watch - Applover is oriented toward startups and SMBs, so it fits an early-stage iOS product more than a large enterprise platform build. Confirm its GoodFirms or Clutch rating before engaging.

Best for: Startups and SMBs that need a native iOS app built alongside product design.
Specialization: Native Swift/Kotlin mobile, web apps, and product design
Pricing: Not public - request a scoped quote
Clutch: Profiles listed on GoodFirms and Clutch - confirm rating before engaging

6. Intuz

Intuz is an IT consulting and software firm headquartered in San Ramon, California, with a development center in Ahmedabad, India. Founded in 2008, they deliver iOS, Android, and cross-platform apps alongside web, cloud, and IoT solutions. For an iPhone build that needs to connect to cloud infrastructure or connected devices, that combined mobile-and-cloud scope is relevant.

They operate as a general IT and software firm rather than an iOS-only boutique, so native Swift depth and iOS-specific design should be confirmed against the specific team assigned to your project.

Notable work - Per its own profiles, Intuz was founded in 2008, is ISO 9001 certified, and is an AWS Consulting Partner. These are company-reported credentials; confirm the iPhone references relevant to your project directly during scoping.

Pricing signal - Not publicly listed; request a quote. Given the cloud and IoT scope, ask them to separate the iOS build from any infrastructure work so the App Store deliverable is clearly priced.

What to watch - Intuz is strongest when iOS is one part of a broader cloud, IoT, or cross-platform engagement. For a pure consumer iPhone app competing on design, an iOS-first boutique is likely a better fit.

Best for: Teams wanting iOS delivery bundled with cloud, IoT, and cross-platform work
Specialization: iOS and Android, cross-platform, cloud, IoT, AWS
Pricing: Not publicly listed; request a quote
Rating: Goodfirms and Clutch profiles listed; confirm rating before engaging

7. Savvy Apps

Savvy Apps is a Washington DC-based boutique focused almost entirely on mobile. Founded in 2009, they have shipped iPhone apps for clients ranging from venture-backed startups to government agencies and established media brands. Their work is iOS-first and UX-driven, with a process that balances design quality with delivery discipline better than most shops of their size.

What differentiates Savvy Apps is their intellectual honesty about scope. They publish their pricing, are transparent about what their process includes, and are direct about when a project is not a fit. That transparency extends to project delivery - they build in research and discovery phases that surface scope risks before development starts, which saves clients from discovering expensive problems midway through a build.

Their portfolio includes healthcare apps, government-facing mobile tools, and consumer lifestyle apps - a range that reflects iOS-first thinking rather than platform-agnostic development. They do both iOS and Android but do not dilute their attention with large web development practices, which keeps their mobile expertise sharp.

Notable work - Savvy Apps built a healthcare mobile application for a federally qualified health center managing patient intake, appointment scheduling, and care coordination. They shipped a consumer loyalty app for a retail brand with 200,000+ active users. Their government work includes a field inspection tool used by state environmental regulators across multiple iOS device types.

Pricing signal - Savvy Apps charges $125-$175/hr. Project minimums are typically $75,000. Full iOS app builds with custom backend range from $100,000 to $250,000, depending on integration complexity.

What to watch - Savvy Apps is a boutique. Their team is small enough that capacity constraints can affect project timelines during peak periods. If you need a large parallel development team or have a very short runway, their capacity model may not accommodate it.

Best for: Startups and mid-market companies that want UX-quality iOS development without enterprise-scale overhead
Specialization: iPhone and Android, healthcare mobile, government mobile, consumer apps
Pricing: $125-$175/hr
Clutch: 4.8/5 (40+ reviews)

8. Livefront

Livefront is a US digital product consultancy headquartered in Minneapolis, Minnesota. They build mobile apps, platforms, and digital products for large companies, working across iOS and Android with a product-quality orientation. For an iPhone app where polish and reliability matter, that US-based product focus is relevant.

Their positioning is that of a digital product consultancy rather than a vertical specialist, so any domain-specific requirements - healthcare compliance, fintech controls - should be confirmed against their specific track record during scoping.

Notable work - None verified. Livefront does not publicly name iPhone clients this list can independently confirm, so request live App Store apps you can download and review before you engage.

Pricing signal - Project-based and not publicly disclosed; confirm directly. Ask for a scope that names the iOS deliverable, backend work, and App Store submission separately so the full cost is visible.

What to watch - Livefront is a US digital product consultancy, which typically carries US-market rates. A fit if you want a domestic product team building polished iPhone apps and platforms; less of a fit if budget is the primary constraint or you need offshore rates.

Best for: Companies wanting a US digital product consultancy to build polished iPhone apps and platforms
Specialization: iOS and Android, digital product development, platforms for large companies
Pricing: Project-based; not publicly disclosed, confirm directly
Rating: Profile listed; confirm before engaging

9. Metova

Metova is a custom software and AI firm headquartered in Bentonville, Arkansas, with an office in Guadalajara, Mexico. They build mobile apps for iOS and Android, websites, and connected and hardware-integrated systems. For an iPhone app that needs to talk to hardware, sensors, or AI services, that connected-systems background is directly relevant.

They present as a custom software and AI firm rather than an iOS-first design boutique, so native Swift depth and App Store process should be confirmed against the assigned team.

Notable work - None verified. Metova does not publicly name iPhone clients this list can independently confirm, so ask for live App Store apps you can download before you engage.

Pricing signal - Project-based and not publicly disclosed; confirm directly. Ask them to separate the iOS build from any hardware, AI, or backend work so the App Store deliverable is clearly scoped.

What to watch - Metova is strongest on custom software, AI, and connected-hardware systems. For a straightforward consumer iPhone app with no hardware or AI dimension, a more focused iOS boutique may be a closer fit.

Best for: Teams building iPhone apps that connect to hardware, sensors, or AI systems
Specialization: iOS and Android, custom software, AI, connected and hardware systems
Pricing: Project-based; not publicly disclosed, confirm directly
Rating: Profile listed; confirm before engaging

10. MindSea

MindSea is a North America-based studio headquartered in Halifax, Nova Scotia, Canada. Founded in 2007, they build custom mobile and web apps with a focus on the healthcare sector, using an all-North-America team. For a healthcare iPhone app, that combination of vertical focus and onshore delivery is directly relevant.

Their concentration is healthcare, so for iPhone apps outside that vertical you get solid mobile execution without the domain-specific depth their healthcare work carries.

Notable work - Per its own profile, MindSea was founded in 2007, runs an all-North-America team, and specialises in healthcare. These are company-reported details; confirm the specific references relevant to your project during scoping.

Pricing signal - Not publicly listed; request a quote. For a healthcare build, ask how they handle HIPAA-related data flows and HealthKit integration and how that is scoped and priced.

What to watch - MindSea's deepest expertise is healthcare iOS from an onshore North American team. For non-healthcare projects, or teams seeking offshore rates, another studio on this list may be a closer fit.

Best for: Healthcare companies wanting a North America-based studio for custom iOS and web apps
Specialization: Healthcare mobile, custom iOS and web apps, North American delivery
Pricing: Not publicly listed; request a quote
Rating: Clutch profile listed; confirm rating before engaging

Side-by-side comparison

Company	Primary strength	Typical engagement	Pricing
303 Software	Regulated-industry iOS and web builds	Compliance-aware mobile delivery	Not public
RaftLabs	Design and Swift engineering in one accountable team	Full-delivery iOS build, fixed scope	Fixed-price, milestone-based
Intelivita	Broad-service mobile and custom software	Offshore mobile/web delivery	Not disclosed
Algoworks	Cross-platform mobile plus platform integration	Mobile alongside Salesforce/Microsoft/AWS work	Not public
Applover	Native mobile and product design for startups/SMBs	Early-stage iOS product builds	Not public
Intuz	iOS delivery bundled with cloud, IoT, cross-platform	Project builds	Not public
Savvy Apps	UX-quality iOS for startups and mid-market	Product builds	$125-$175/hr
Livefront	US digital product consultancy, polished iPhone apps	Project-based	Not public
Metova	iPhone apps connected to hardware, sensors, AI	Project-based	Not public
MindSea	Healthcare iOS, North America-based studio	Custom app builds	Not public

The question that separates the right iOS partner from the wrong one

Most buyers evaluate iOS vendors on team size or hourly rate alone, and get the fit wrong before they get the vendor wrong. Every firm on this list owns full delivery - requirements, design, Swift development, QA, and App Store submission inside one accountable team - so the real fork isn't managed delivery versus a marketplace. It's specialism and fit.

Some firms here specialize by industry - 303 Software in healthtech and regulated builds, MindSea in healthcare, Savvy Apps in healthcare and government mobile - and are the safer choice when compliance is part of the scope. Others (Intelivita, Intuz, Metova) are broad offshore shops that cover mobile, web, and custom software at a defined scope. Applover is oriented toward startups and SMBs, Algoworks pairs mobile with Salesforce, Microsoft, and AWS platform work, and Livefront is a US digital product consultancy for polished consumer apps.

RaftLabs is built for end-to-end product delivery with fixed scope and design and engineering in one team. Getting the fit wrong is more expensive than getting the vendor wrong.

"We think it's a combination of it being a great systems and apps programming language that's fast and safe, but also being really expressive and easy to learn." - Craig Federighi, Apple's Senior Vice President of Software Engineering, describing Swift's design goals

According to Statista, iOS users account for over 55% of US mobile app spending, despite representing a smaller share of total device market. For businesses targeting high-income markets in the US, UK, and Australia, iOS is not the secondary platform. The quality of your iOS execution matters directly to revenue.

The verdict

303 Software for an iOS app in healthtech or another regulated industry that needs compliance-aware delivery.

RaftLabs for a production iOS app shipped end-to-end with fixed scope and a defined timeline, with design and engineering in one team.

Intelivita for an offshore mobile, web, and custom-software partner on a defined scope.

Algoworks for cross-platform mobile built alongside Salesforce, Microsoft, or AWS integration work.

Applover for an early-stage iOS product that needs engineering and product design together.

Intuz for iOS delivery bundled with cloud, IoT, and cross-platform work.

Savvy Apps for startups and mid-market companies that want UX-quality iOS development without enterprise-scale overhead.

Livefront for a US digital product consultancy to build polished iPhone apps and platforms.

Metova for iPhone apps that connect to hardware, sensors, or AI systems.

MindSea for healthcare companies wanting a North America-based studio for custom iOS and web apps.

The first filter is fit: an industry specialist, a broad offshore shop, or an end-to-end product team. The second filter is the specific problem you're solving - scale, design leadership, compliance, budget, or specialist depth. Match those two questions to the right firm on this list.

RaftLabs ships production iOS apps for businesses. 4.9/5 on Clutch. Talk to a founder about your iOS app.

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Common questions

: A simple iOS app (3-5 screens, basic backend, no third-party integrations) costs $15,000-$35,000. A production iOS app with user accounts, push notifications, payments, and a backend API costs $40,000-$100,000. A complex iOS app with real-time features, offline sync, custom animations, or hardware integrations (camera, ARKit, HealthKit) costs $100,000-$250,000. These ranges assume a fixed-price engagement with a dedicated iOS developer and QA tester.
: A simple iOS app takes 6-10 weeks from signed scope to App Store submission. A mid-complexity production app takes 12-18 weeks. Complex apps with heavy backend, real-time data, or hardware integrations take 20-32 weeks. Apple's App Store review adds 1-3 days after submission. Rejection and revision cycles can add 1-2 weeks. Plan for at least one revision round in your timeline.
: Choose native Swift if: your app is performance-sensitive (video, AR, gaming, real-time audio), you need deep iOS system integrations (HealthKit, ARKit, Core ML, NFC), or your product is iOS-only and you want access to every Apple API on day zero. Choose React Native or Flutter if: you need iOS and Android simultaneously and budget is constrained, your app is content-driven with standard UI patterns, or your team already has strong JavaScript or Dart skills. Cross-platform apps cover 80-90% of use cases. Native Swift is the right choice for the remaining 10-20% where performance or platform depth matters.
: Ask for the App Store rating and day-30 retention rate for a production app they've shipped. Ask which iOS version their most recent app supports and how they handle deprecations. Ask how they implement ATT consent flows for apps that use ad tracking. Ask for their App Store submission process and how many rejections they typically encounter. Ask how they handle Apple's annual iOS release and whether they've already shipped apps on the latest SDK. Companies that can answer these questions specifically have shipped real iOS apps.
: An iOS development company owns the full delivery: requirements definition, UI/UX design, iOS development, backend API, QA testing, App Store submission, and post-launch support. They take project responsibility. An iOS developer marketplace connects you with individual iOS developers for hire - you manage the project, integrate the code, handle QA, and submit to the App Store yourself. Companies are better for defined product builds. Marketplaces are better for augmenting an existing iOS team with specialist capacity.
: Ask for the App Store rating and day-30 retention rate for a production app they've shipped - retention is the number that reveals whether the app actually works, since a rating alone doesn't show whether users kept using it. Ask for three live App Store links, not screenshots. The red flag is a portfolio that shows mockups instead of working links, or links that lead to landing pages rather than App Store listings - verify every app in the portfolio is actually live before engaging.
: Ask which iOS version their most recent app supports, how they test against beta iOS releases before Apple's annual September update, and how many SwiftUI-first apps - not UIKit apps with a few SwiftUI screens bolted on - they've shipped. Ask them to walk through navigation, state management, and data flow in a full SwiftUI app. The red flag is a company that treats annual iOS updates as a surprise rather than routine, or whose 'SwiftUI experience' turns out to be a couple of screens wrapped around an otherwise UIKit codebase.
: Ask how they implement ATT consent flows for apps that use advertising or analytics, and confirm they know the difference between IDFA and IDFV - a developer who doesn't hasn't shipped a production app with tracking in the last three years. Also confirm they'll ask about your Apple Developer Program account and code-signing setup in the first conversation. The red flag is a company that skips this question entirely, which usually means they haven't shipped under client accounts before or plan to submit under their own account, an ownership problem you inherit later.
: Ask how many submission attempts their last three projects required, what the most common rejection reasons were, and who handles keyword research and screenshot design before submission. A team that has never hit a rejection either hasn't shipped many apps or isn't being candid. The red flag is a company that considers the job done at code handoff and never raises App Store optimization - the App Store is a search engine, and ignoring ASO leaves a real distribution lever unused.
: Ask them to walk through the last App Store rejection they received for a client - what the reason was and how they resolved it. Every company that ships iPhone apps receives rejections; Apple's review guidelines are detailed, frequently updated, and interpreted inconsistently across reviewers. A company that has shipped many apps has a library of rejection experiences: a privacy policy that was too vague, a camera permission string that didn't explain the use clearly enough, an in-app purchase flow that didn't meet guideline 3.1.1. A company that says "we've never had a rejection" either hasn't shipped many apps or isn't telling the truth. A company that can walk you through a rejection and resolution has real process.
: iOS has a specific set of failure modes that general software QA does not capture: memory pressure events when iOS terminates background processes, push notification delivery edge cases across iOS permission states, keychain behavior across iOS updates, background refresh reliability, and UI rendering on different iPhone display sizes and refresh rates. Ask specifically what iOS-specific test cases are in their QA plan. A company that describes a generic software testing process rather than an iOS-specific one has not thought through the failure modes that matter for your app.