Mobile App Development
iOS and Android apps built by 20+ engineers. React Native and Flutter.
TL;DR
We build iOS and Android apps using React Native and Flutter. Fixed price. One codebase, both app stores. Full source code handoff.
What We Build in 2026
We build mobile apps for startups and businesses that need to ship fast without compromising on quality. Looking to validate an idea first? Check out our guide on building an MVP to understand how mobile apps fit into a lean launch strategy.
iOS Apps
Native and cross-platform iOS apps built for the App Store. We handle everything from UI design to TestFlight distribution and App Store review submission.
Android Apps
Android apps optimized for the full range of devices and screen sizes. Published to Google Play with proper signing, listing optimization, and staged rollout.
Cross-Platform Apps
Single codebase apps that run on both iOS and Android using React Native or Flutter. Faster development, lower cost, and consistent user experience across platforms.
Mobile SaaS
Subscription-based mobile products with authentication, in-app purchases, push notifications, analytics, and backend APIs built to scale with your user base.
Our Mobile Tech Stack
We pick the right framework for each project based on your requirements, timeline, and long-term goals. For pricing details on mobile projects, see our MVP development cost guide.
- React Native is our default choice for cross-platform apps. It shares code with web apps and has a massive ecosystem of libraries.
- Flutter is ideal when you need pixel-perfect custom animations or complex UI that goes beyond standard components.
- Swift and Kotlin are used when the app requires deep integration with platform-specific features like ARKit, HealthKit, or Android sensors.
- Firebase powers real-time databases, authentication, push notifications, and analytics for projects that need speed over custom infrastructure.
Pro Tip
If you are building a mobile app alongside a web dashboard, React Native is almost always the right call. Your mobile and web teams share the same language (TypeScript), the same state management patterns, and even some of the same components. This keeps your codebase lean and your team productive.
Our Mobile App Development Process
Every mobile app we build follows a structured five-step process. This is how we ship polished, App Store-ready products on time and on budget. For a broader look at our approach, visit our MVP development services page.
Requirements
We start with a detailed requirements session to define your app's core features, target platforms, and user flows. We document everything before a single line of code is written.
UI/UX Design
Our designers create mobile-first interfaces in Figma, following iOS Human Interface Guidelines and Material Design principles. You approve every screen before development begins.
Development
Our engineers build your app using production-grade architecture with clean code, proper state management, and scalable backend APIs. Daily progress updates keep you in the loop.
QA Testing
We test on real devices across multiple OS versions and screen sizes. Performance profiling, crash reporting, and edge case testing ensure your app is stable at launch.
App Store Launch
We handle the full submission process for the App Store and Google Play, including screenshots, descriptions, and compliance reviews. Your app goes live with zero hassle.
Ready to build your mobile app?
Book a free call. We will recommend the right platform, scope your project, and give you a fixed price.
Start a ProjectTrusted by Founders Worldwide
Companies we've worked with
What Our Clients Say
“10/10 would recommend this! We used UniqueSide to get a head start on a React Native MVP and Manoj delivered a pretty solid app for us.”
Ellis Crosby
CTO, ScarlettPanda
“MyThoughts app is ready! Excited to polish it and integrate it into MyZone AI Chatbots. The work delivered was exactly what we needed.”
Shimecki
Founder, MyZone AI
“I truly enjoyed working with UniqueSide. Very great to work with, very diligent and keeps to his word. Very amazing with meeting deadlines too. The quality of the work was also great.”
Kofi
Founder
Frequently Asked Questions
How long does it take to build a mobile app in 2026?
A simple mobile app MVP takes 2 to 4 weeks. More complex apps with custom backends, AI features, or multiple integrations typically take 4 to 8 weeks. We give you a firm timeline before we start so you can plan your launch around it.
Should I use React Native or Flutter?
React Native is our default recommendation for most startups because it shares code with web apps and has a massive ecosystem. Flutter is better when you need pixel-perfect custom animations or complex UI that goes beyond standard components. We help you pick the right one based on your product goals.
Can you build for both iOS and Android at the same time?
Yes. With React Native or Flutter, we build a single codebase that runs on both iOS and Android. This cuts development time nearly in half and keeps both platforms in sync for future updates. You get two apps for the cost of one.
How much does mobile app development cost?
Our mobile app projects start at $8,000 for an MVP. The final price depends on features, complexity, and whether you need backend APIs built alongside the app. Everything is fixed price with no hourly billing. See our MVP development cost page for a full breakdown.
Do I own the source code for my mobile app?
Yes, 100%. You get full ownership of all source code, designs, and app store accounts. We hand over everything in a private GitHub repository and transfer all credentials to you. There are no licensing fees or vendor lock-in.
Let's build your app together.
Tell us what you're building. We'll recommend the right platform, scope it, and ship it fast.
Start a Project