Mobile app development has unique demands that web development does not. App store review processes, device-specific performance requirements, and platform-specific design conventions mean you need a partner with genuine mobile expertise — not a web agency that has built a few apps.
Mobile-Specific Evaluation Criteria
Platform Expertise
The most important question: What is their mobile-specific experience?
- Native iOS: Experience with Swift/SwiftUI, Xcode, Apple frameworks, and iOS-specific patterns
- Native Android: Experience with Kotlin/Jetpack Compose, Android Studio, and Android-specific patterns
- Cross-platform: Depth with React Native or Flutter, including native module development when platform APIs require it
Ask which approach they recommend for your project and why. An agency that always recommends the same approach regardless of requirements is selling what they know, not what you need.
App Store Experience
This is where many web-focused agencies fail:
- How many apps have they successfully published to both app stores?
- Have they dealt with app store rejections? How did they handle them?
- Do they understand Apple's Human Interface Guidelines and Google's Material Design standards?
- Can they advise on App Store Optimization (ASO)?
- Do they handle the app store submission process?
Live Apps
The best evidence of mobile capability is live apps in the app stores:
- Download and use their portfolio apps yourself
- Check ratings, reviews, and update frequency
- Evaluate performance, design quality, and user experience firsthand
- Look for apps that have been maintained over time, not just launched and abandoned
Backend and API Experience
Mobile apps need server infrastructure:
- Do they build backend APIs or only mobile frontends?
- If they build both, what backend technologies do they use?
- How do they handle offline sync and data consistency?
- What is their approach to push notification infrastructure?
Questions to Ask
About Mobile Specifically
- "Walk me through a recent app you built, from concept to app store launch."
- "How do you handle app store rejections?"
- "What is your approach to supporting new iOS and Android versions annually?"
- "How do you handle beta testing and staged rollouts?"
- "What analytics and crash reporting tools do you integrate?"
About Design
- "Do you have mobile-specific designers on your team?"
- "How do you adapt the design between iOS and Android?"
- "Do you conduct usability testing on mobile devices?"
- "How do you approach accessibility for mobile?"
About Process
- "How do you involve clients in testing during development?"
- "How frequently will I receive test builds?"
- "What does your QA process look like for mobile?"
- "How many devices do you test on?"
About Post-Launch
- "What happens when Apple or Google changes their guidelines?"
- "How do you handle crash monitoring and bug triage?"
- "What is your typical release cadence for apps you support?"
- "What does ongoing maintenance cost?"
Red Flags
Web Agency Doing Mobile "Too"
An agency whose portfolio is 90 percent websites with a couple of apps is not a mobile development agency. Mobile development requires specialized skills and experience.
No Live Apps in Stores
If they cannot point you to apps in the App Store or Google Play that they built, their mobile experience is theoretical.
Ignores Platform Differences
An agency that proposes the same design for iOS and Android, or cannot explain the differences in platform conventions, lacks mobile depth.
No Discussion of App Store Process
Experienced mobile agencies discuss app store requirements proactively — review timelines, guidelines compliance, and submission preparation. If they do not mention it, they may not have much experience with it.
Cannot Demonstrate Performance Optimization
Mobile performance requires active effort. Ask about their approach to app launch time, animation smoothness, memory management, and battery impact. Vague answers signal limited experience.
No Testing Device Lab
Serious mobile agencies have real devices for testing. Testing only on simulators misses real-world issues.
Comparing Cross-Platform vs Native Expertise
If your project requires cross-platform development (React Native or Flutter), evaluate:
- How many cross-platform apps have they shipped?
- Have they written custom native modules when needed?
- How do they handle platform-specific behavior differences?
- What is their experience with platform-specific features (widgets, watch apps, CarPlay)?
If your project requires native development, evaluate:
- Do they have dedicated iOS and Android developers?
- How do they coordinate between platform teams to ensure feature parity?
- What is their experience with platform-specific APIs and capabilities?
Structuring the Engagement
Discovery Phase ($5,000 to $20,000)
Start with a paid discovery phase before committing to the full build:
- Technical feasibility validation
- Architecture proposal
- Design prototypes for key screens
- Detailed estimate for the full project
This protects your investment and gives you deliverables even if you decide not to proceed.
Development Phase
Insist on:
- Bi-weekly sprint demos with working builds you can install on your phone
- Access to TestFlight (iOS) and internal test tracks (Android) throughout development
- Sprint reports showing progress against the backlog
- Crash reporting and analytics from the first testable build
Post-Launch Support
Define clearly:
- Ongoing support hours and response times
- Process for emergency bug fixes
- OS update compatibility responsibilities
- App store guideline compliance monitoring
- Analytics review and optimization recommendations
Making Your Decision
The right mobile app agency should:
- Have multiple live apps in the stores that you can download and evaluate
- Demonstrate clear understanding of the differences between iOS and Android
- Have a mature process for app store submission and compliance
- Include mobile-specific designers on their team
- Plan for the ongoing maintenance reality of mobile apps
- Communicate clearly and respond promptly during evaluation
Ready to discuss your mobile app project? Contact us for an honest assessment.
For the complete picture, read our Complete Guide to Mobile App Development.