Your business,
in every pocket
We develop native and cross-platform apps for iOS and Android with React Native and Flutter. Mobile experiences that retain users and generate revenue.
Mobile development from start to finish
Cross-platform (iOS + Android)
A single codebase for both platforms. With React Native and Flutter we build apps that run natively on iOS and Android, cutting development time and cost by up to 40%.
Native UX/UI design
Interfaces that respect each platform’s design guidelines. Your users will feel the app is native because we follow the Material Design and Human Interface Guidelines patterns.
API integrations
We connect your app to any external service: payment gateways, CRMs, ERPs, authentication systems, maps, social networks and first- or third-party APIs.
Push notifications
Segmented push notifications to keep your users informed and engaged. We set up Firebase Cloud Messaging and the Apple Push Notification Service.
Built-in analytics
Detailed metrics on your users’ behaviour from day one. We integrate Firebase Analytics, Mixpanel or the tool of your choice so you can make data-driven decisions.
Store publishing
We handle the entire App Store and Google Play publishing process: screenshots, ASO descriptions, policy compliance and listing optimisation.
Why your business needs an app
Mobile is the primary way people access the internet in Spain, accounting for more than 80% of web traffic. A well-designed app puts you in your customers’ pockets 24/7, lets you deliver personalised experiences and opens direct communication channels through push notifications. Unlike a website, a native app can work offline, access device features such as the camera or GPS, and respond with a speed that builds trust and loyalty.
At VERTEX we favour cross-platform development with React Native and Flutter because it lets us deliver high-quality apps for iOS and Android simultaneously, without duplicating the development effort. That translates into shorter timelines, tighter budgets and simpler maintenance. Our team has experience with e-commerce, internal management, delivery, fitness and fintech apps, among others.
Our process starts with a product workshop where we define the key features, the user flows and the visual design. We then work in agile sprints with demos every two weeks. Before launch we run thorough testing on real devices and set up the full CI/CD pipeline so future updates are fast and safe. The result is a robust, scalable app that is ready to grow with you.
Frequently asked questions
Native or cross-platform? +
For most projects we recommend cross-platform with React Native or Flutter, since it lets you launch on iOS and Android with a single codebase, reducing cost and time. We only recommend pure native development (Swift/Kotlin) when the project needs intensive access to specific hardware, such as advanced AR or real-time video processing.
How much does it cost to build an app? +
The cost varies with complexity. A simple app with authentication, listings and forms starts at 8,000-12,000 euros. Apps with advanced features such as payments, geolocation or real-time chat sit between 15,000-30,000 euros. In the first free consultation we give you a detailed quote.
How long does it take? +
An app with basic functionality is developed in 8-12 weeks. More complex projects can take 4-6 months. We work in two-week sprints with intermediate demos so you can see the progress and give us continuous feedback.
Do you publish to the App Store and Google Play? +
Yes, we manage the whole publishing process. This includes creating the developer accounts if you don’t have them, preparing ASO-optimised screenshots and descriptions, reviewing policy compliance and submitting for review. We also handle subsequent updates.
What does maintenance include? +
Our maintenance plans cover operating system updates (new iOS and Android versions), bug fixes, crash monitoring, security updates and technical support. We also offer new feature development on demand.
Ready to get started?
Tell us your idea and we'll help you turn it into an app your users will love.
Request a quote