iOS & Android App Development
App369 builds cross-platform mobile apps using Flutter that cost 30-40% less than separate native builds (Clutch, 2025). With 150+ apps delivered and a 98% on-budget rate, we turn business ideas into high-performance iOS and Android applications.
Mobile, web, UX, consulting, and AI delivery under one product engineering team.
Full-stack product delivery across mobile, web, UX, consulting, and AI.
Full-Stack Mobile Services
Cross-Platform Flutter Development
Build one codebase that runs on both iOS and Android. Flutter is used by 42% of cross-platform developers worldwide (Statista, 2025), and delivers near-native 60fps performance from a single Dart codebase.
User-Centric Design
Every dollar invested in UX returns $100 (Forrester Research). Our design process combines user research, interactive Figma prototypes, and usability testing to create interfaces that convert.
Scalable Cloud Architecture
Apps built on Firebase and Google Cloud Platform that handle 10 to 10 million users. Our architecture supports real-time data sync, push notifications, and auto-scaling infrastructure.
Secure & Compliant
Security aligned with OWASP Top 10 guidelines. We implement end-to-end encryption, biometric authentication, and HIPAA-compliant data handling where required.
Our Process
Discovery & Planning
We start by understanding your business goals, target audience, and app requirements to create a comprehensive development plan.
UI/UX Design
Our designers create intuitive, engaging interfaces that align with your brand and provide exceptional user experiences.
Development
Our expert developers build your app using the latest technologies and best practices, ensuring high performance and scalability.
Testing & QA
Rigorous testing across devices and platforms to ensure your app is bug-free, secure, and delivers a reliable experience.
Deployment
We handle the app store submission process and ensure your app meets all requirements for successful launch.
Maintenance & Support
Ongoing support, updates, and enhancements to keep your app running smoothly and evolving with your business needs.
Frequently Asked Questions
How much does it cost to develop a mobile app?
According to Clutch's 2024 App Development Survey, the median cost for a mobile app ranges from $25,000 to $300,000 depending on complexity. Simple apps with basic features typically cost $15,000-$50,000, while medium-complexity apps with user authentication, API integrations, and push notifications run $50,000-$120,000. Enterprise-grade applications with real-time data sync and microservices architecture can exceed $150,000. At App369, we leverage Flutter's cross-platform capabilities to reduce costs by 30-40% compared to building separate native iOS and Android apps.
How long does it take to build a mobile app?
According to GoodFirms research, the average mobile app takes 4.5 months to develop. Simple apps with core features take 2-3 months, medium-complexity apps with backend API integration and user management require 3-6 months, and complex enterprise applications with real-time features and CI/CD pipelines can take 6-12 months. Flutter cross-platform development reduces timelines by 30-40% compared to building separate native apps in Swift and Kotlin.
Should I build for iOS, Android, or both?
According to StatCounter, Android holds 72% global mobile market share while iOS holds 27%, but iOS users spend 2.5x more on in-app purchases according to Sensor Tower data. Building for both platforms maximizes your addressable market. Using Flutter, App369 develops iOS and Android apps from a single codebase, which is 30-40% more cost-effective than building two separate native apps while delivering near-native performance at 60fps rendering.
What is Flutter and why do you use it?
Flutter is Google's open-source UI toolkit used by over 1 million apps worldwide, including Google Pay, BMW, and Alibaba. According to the 2024 Stack Overflow Developer Survey, Flutter is the most popular cross-platform framework. It compiles to native ARM machine code for both iOS and Android, delivering 60fps performance with a single Dart codebase. App369 uses Flutter because it reduces development time by 30-40% and ensures pixel-perfect consistency across platforms.
Do you provide ongoing maintenance and support?
Yes. According to Gartner, organizations should budget 15-20% of the initial development cost annually for app maintenance. App369 provides comprehensive post-launch support including bug fixes, OS compatibility updates for new iOS and Android releases, security patches, performance monitoring via Firebase Crashlytics, and feature enhancements. Our maintenance packages include CI/CD pipeline management and automated regression testing.
Can you help with app store submission?
App369 handles the entire submission process for both Apple App Store and Google Play Store. According to Apple, 40% of apps are rejected on first submission due to guideline violations. Our team prepares all required assets, writes ASO-optimized descriptions, and ensures compliance with the latest Apple Human Interface Guidelines and Google Play Store policies. We also set up TestFlight for iOS beta distribution and Google Play's internal testing tracks.