Mobile App
We design and build mobile apps for companies and startups — from concept and UX/UI to development, backend, app store release and ongoing development. We work natively in Swift and Kotlin, and cross-platform in React Native and Flutter. We choose the technology based on the product, its features, the budget and plans for growth.
Companies that trusted us
The basics
When is it worth building a mobile app?
A mobile app makes sense above all when users use the product regularly, or when you need push notifications, access to phone features - such as the camera, GPS or payments - or offline operation. If you don't have those needs, a well-designed web app or mobile website may be a simpler and cheaper solution. That's why, before development starts, we help you assess which technology best fits the product's business goals.
It's a different story with internal apps for employees, such as service technicians, sales reps or field teams. Offline access, barcode scanning, location and quick reporting can make their everyday work much more efficient.See the mobile apps we built for clients
A home-cooked meals marketplace with Wolt delivery – selling your own food legally
Client: HomeChefs
Industry: Food Industry / FoodTech
Moving from mobile to web without losing users or business logic
Client: SkinApe
Industry: Entertainment / GameTech
„The team delivers in line with our expectations, and the way we work together fits our needs. What we value most is their strong commitment.”
Jakub Kaczmarek — Co-Founder, iSing Sp. z o.o.
Review from Clutch
How we work
From the first version to app store release
We start by deciding what goes into the first version — and, more importantly, what doesn't. Then we design the user flows, build, test on real devices and publish. Publishing is a separate stage with its own timeline: the app stores review apps before approving them and can send them back with comments.
On your side are the developer accounts in both stores (they must be registered to the company, not a private individual — a common and costly mistake), materials for the store listing and the decision on the privacy policy. On our side are the design, the code, testing and preparation for release.
The timeline depends on the number of screens, integrations with your systems and whether the app needs to work offline — syncing data once the connection is back is a separate, non-trivial task, not an add-on.
Decisions
Decisions that determine maintenance costs for years to come
One codebase or two native apps. React Native and Flutter mean one codebase for iOS and Android: lower build and maintenance costs, with small compromises on the most demanding animations. Swift and Kotlin win when you need close integration with hardware and where every frame counts. For most business uses, the first route is enough — we justify our recommendation by the cost over the years, not just the price of the initial build.
Whether the app has to work without internet. This isn't a switch — it's an architectural decision that changes how data is stored and requires resolving conflicts during sync. It's worth making it at the start, because adding it later means a rebuild.
Who will maintain the app after launch. Mobile operating systems force updates several times a year, whether or not you change anything in the product. An app without a maintenance plan stops installing after two years.
What not to do. Don't move your entire website into an app "just because". Don't set up the developer account on an employee's private email address. And don't schedule the launch for a day when it absolutely has to go live — app store review runs on its own schedule, independent of yours.
Scope
Mobile apps tailored to the product and the business
We've built training, loyalty and sales apps as well as marketplaces, among others. Fit Paradise adapts workout plans to the user's progress, SAO Life supports the SAO House club's loyalty program, and HomeChefs lets people order home-cooked meals for delivery.
We don't copy a website into an app "one to one". We design features and the user experience to take advantage of what mobile devices can do and to serve a specific business goal.Technology
Native or cross-platform — the product decides
We choose the technology to fit the product's needs, not the other way around. We build native apps in Swift and Kotlin and cross-platform apps in React Native and Flutter. On the backend, we design the APIs, databases, integrations and systems needed to support the app. We use Node.js, Firebase and other technologies suited to the project's architecture.
We handle the App Store and Google Play release together with the client, from developer accounts to compliance with reviewers' guidelines.
Before launch, we share test builds through TestFlight and Google Play's testing tools to gather feedback and fix issues before the public release.
After launch
Developing and maintaining the app after launch
Launch is the start of the product's further development. We analyze user behavior, retention and the key paths through the app, so that the next changes are driven by data, not guesswork.
We also help keep the app compatible with new versions of iOS and Android, develop new features and adapt the product to changing business needs.Related services
Web Development
We design and build custom web applications - from an MVP that lets you quickly validate an idea to large platforms and systems developed over years. We build both the front end and the backend, APIs, databases, admin panels and integrations with external systems. We work with Next.js, React, Node.js, NestJS, Python, PostgreSQL and MongoDB, among others. We create solutions tailored to a specific business process: SaaS applications, internal systems, sales platforms, websites, marketplaces and CMS systems.
Learn moreMobile Development
We design and build mobile apps for iOS and Android — from the first concept and UX/UI to development, backend and release on the App Store and Google Play. We work with native technologies — Swift and Kotlin — and cross-platform ones such as React Native and Flutter. We choose the technology based on the product, its features, the budget and plans for growth.
Learn moreE-commerce
We design and build online stores and e-commerce platforms tailored to your sales model and business processes. We work with off-the-shelf solutions as well as headless architecture and custom sales systems. We build e-commerce for B2C and B2B sales, large product catalogs, multiple markets and marketplaces. We integrate stores with ERP, WMS, CRM, PIM, payments and logistics, and design product configurators and custom purchase flows. We also take care of performance, technical SEO and preparing the platform for seasonal traffic peaks.
Learn moreUX/UI Design
We design UX/UI for web and mobile applications and B2B systems - from analyzing user needs and early wireframes to the finished interface and a design system in Figma. We don't design screens in isolation from the product. We look at user journeys, analytics data and technical constraints to create a solution that's easy to use and can be built efficiently. After the product launches, we can come back to heatmaps, session recordings, analytics and user interviews, so that the next changes are driven by data, not assumptions.
Learn moreFAQ
Questions we hear before building an app
- The cost of a mobile app depends mainly on the number and complexity of features, UX/UI design, integrations with external systems, the backend and any offline functionality requirements. Once we understand the project scope, we can prepare a preliminary cost and timeline estimate.
- The timeline depends on the project scope. A simple MVP can be built much faster than a complex app with a backend, multiple integrations and offline support. Before work begins, we break the project into stages and set a schedule.
- It depends on the product. React Native and Flutter work well for many business apps built simultaneously for iOS and Android. We choose Swift and Kotlin where maximum performance or deep device integration is critical.
- Yes. We build apps for both iOS and Android — native and cross-platform. We can deliver one product for both platforms or separate apps if the project requirements call for it.
- Yes. We prepare the app for submission, help meet store requirements and support the review process. The developer account stays on the client's side, so they retain full control of the app.
- Yes. We can take responsibility for technical maintenance, updates, monitoring and the development of new features based on data and user feedback.
- Almost always yes, and we design it alongside the app: API, user accounts, push notifications, data sync. If you already have a working API, we start by reviewing what it provides — adding a second backend is the most common way to double maintenance costs.
