Mobile App Development

Custom mobile app development for iOS and Android

We design and build native and cross-platform mobile apps that generate revenue and retain users. 13 years of shipping production-grade iOS and Android apps for startups, scaleups, and enterprise brands, delivered for a fixed price.

Experian
skylight
Consumer_Reports
National Public Radio
Cymbiotika
Fanduel
Simplisafe
Dorel
hp
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ExperianskylightConsumer_ReportsNational Public RadioCymbiotikaFanduelSimplisafeDorelhp
Andew Amann and Rose Grabowski

An award-winning AI development agency with a proven track record

We build custom AI systems that deliver measurable ROI for established companies. Production-grade solutions built by engineers who've shipped 150+ AI projects. Purpose-built systems around your data, your workflows, and your team.

70+
A talented team of 70+ experts delivering excellence every day.
150+
Successfully delivered across industries and markets.
98%
Consistently meeting deadlines with precision and reliability.
#1
Leading Boston businesses toward digital success.

Awards and recognition

Andew Amann and Rose Grabowski
home-9-fast-50-logo
home-9-top-champion-clutch-logo
home-9-family-choice-logo
ces-innovation
Clutch global spring 2026
Clutch TOP ML 2026
Clutch TOP AI 2026
Clutch global spring 2025
Clutch TOP ML
Clutch TOP Company
Clutch TOP Chatbot Company
top firm_software dev
top firm_ai
top firm_ai-chatbots
top firm_data-science
home-9-fast-50-logo
home-9-top-champion-clutch-logo
home-9-family-choice-logo
ces-innovation
Clutch global spring 2026
Clutch TOP ML 2026
Clutch TOP AI 2026
Clutch global spring 2025
Clutch TOP ML
Clutch TOP Company
Clutch TOP Chatbot Company
top firm_software dev
top firm_ai
top firm_ai-chatbots
top firm_data-science
Real Impact, Real Results

Mobile app development for teams who need it to ship on time

01

Native when it matters, cross-platform when it counts

We choose the right approach per feature, not per project, so you get native performance where users feel it and shared codebase efficiency where budget matters.

02

Fixed price, on-time delivery

26 of our last 27 projects shipped on time and within 7% of budget. You know the full cost before development starts, with no surprise change orders.

03

13 years of mobile engineering

We have been building iOS and Android apps since 2012, shipping 150+ products across consumer, enterprise, IoT, and AI categories.

Mobile apps built for scale

What mobile app development looks like in practice

We handle the full mobile product lifecycle: strategy, UI/UX design, engineering, QA, deployment, and ongoing support across iOS and Android.

Native iOS development

Swift, SwiftUI, and Objective-C for apps that need peak performance, deep iOS integration, or App Store polish. Hidden Brain launched to 3 million NPR listeners with a native iOS app and earned 5.0-star user reviews. We handle push notifications, widgets, background processing, CameraKit integration, and App Store submission.

Native Android development

Kotlin and Java for Android apps that need deep platform integration, background services, or hardware access. OnTrac's Android driver app doubled revenue by sequencing millions of packages with ML route optimization. We handle WorkManager, foreground services, NFC, Bluetooth, and Google Play submission.

AI-powered mobile apps

We embed AI directly into mobile apps: on-device ML models, camera-based vision systems, personalized coaching, and intelligent recommendations. SWEE's iOS app combined native engineering with an AI coaching model to lift downloads by 304%. VSAC's mobile app used AI to cut financial aid comparison time by 70%.

Key Features

Mobile apps built to scale and last

SOC 2 Type II compliant

Sensitive user data, authentication, and API integrations are handled to enterprise security standards across both platforms.

Full transparency development

Weekly demos, sprint reviews, and full access to our project management tools (Monday.com) so you always know what is happening with your app.

You own everything

All source code, data, and deployed apps are built in your infrastructure. No platform fees, no vendor lock-in.

our process

How we keep your software running

AI Discovery Sprint

Our process starts with connecting you to our leaders, who have built over 150 projects.  If aligned, the second call will include our Product Managers and Engineers to scope the project. The final step is a proposal presentation.

Rapid Validation Sprint

We start by immersing ourselves in your business, industry, and existing software. We then build a functional proof-of-concept to validate the technical feasibility. This hands-on planning process arms you with a clear architectural blueprint and a precise technical implementation roadmap for the next phase.

Development & Build

Production-grade AI software, built in your infrastructure, with real-time visibility into every task. No prototypes, no maybe's. Just code that delivers testable ROI. We trademarked Full Transparency Development ™ , so you’re never left in the dark.

Launch, Scale & Own

Go live, measure results, and scale AI across your organization at a predictable cost. We build with the right guardrails and measure KPIs on real results. We train your team to operate and manage what we developed, or we can provide ongoing maintenance and support.

Success Stories

Teams that rely on our mobile app development

Success Stories

Teams that rely on our mobile app development

Cut financial aid comparison time by 70% for students

Arrow Right

PM was amazing. They were on top of everything and kept the project moving very quickly.

Patrick Leduc
Vice President & COO at VSAC
70%
Faster comparisons
iOS
Native
Android
Native

Grew SWEE app downloads by 304%

Arrow Right

NineTwoThree's specialists are excellent communicators.

Michael Del Mauro
Co-Founder of SWEE Technologies
304%
Downloads lift
iOS
Native launch
AI
Coaching model
FAQs

Find your answer in seconds

Should we build native or cross-platform?

It depends on your requirements. Native iOS (Swift) and Android (Kotlin) deliver the best performance, deepest platform integration, and best user experience. Cross-platform frameworks like React Native and Flutter save time and budget when you need both platforms quickly. We help you choose per feature, not per project, because some features need native code regardless of your framework choice.

How long does it take to build a mobile app?

Most mobile apps take 12 to 20 weeks from kickoff to launch, depending on complexity. Simpler apps with fewer integrations ship faster. Enterprise-scale platforms with complex backend integrations run longer. Every project starts with a discovery phase that produces a fixed timeline and budget.

Can you embed AI into a mobile app?

Yes. We build AI-powered mobile apps with on-device ML models, camera-based vision systems, personalized coaching, and intelligent recommendations. SWEE's iOS app used an AI coaching model to lift downloads by 304%, and VSAC's mobile app used AI to cut financial aid comparison time by 70%.

Do we own the code?

Yes. Everything is built in your infrastructure. You own the source code, the data, and the deployed app. No platform fees, no vendor lock-in. We train your team to take over, or we can provide ongoing maintenance and support.

What does mobile app development cost?

Mobile app development typically ranges from $75,000 to $300,000+ depending on scope, platform choice, and complexity. We deliver fixed-price proposals after a discovery call, so you know the full cost before development starts. Our last 27 projects finished within 7% of budget. For a detailed breakdown, see our Complete Guide to Mobile App Development Planning and Costs.

Contact us

Ready to become an AI-first company? Let’s connect.

Build a new platform, or add AI capabilities to existing software, we deliver solutions that work in real operational environments.

  • Meet with founders Andrew Amann & Pavel Kirillov

    founders
  • Custom AI implementation roadmap

  • No sales pressure

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