Just Site
HomeServicesProjectsBlogAboutContact
Become a client!

Cookie Policy

We use cookies in your browser to provide you with the best experience on our site. Additionally, your behavior on the site helps us improve our site so that future customers have even better experiences with it.

Privacy PolicyCookie Policy
Mobile apps

We build mobile apps for business

Android, iOS and cross-platform — from idea and MVP, through integrations with your systems, to store release and long-term product growth.

Get a quote→See our work

An app that actually supports the business

We start from your business goal, design the shortest path to reach it and ship a working product you can keep growing.

We advise whether native, cross-platform or a web app fits best — so you don’t overpay for technology you don’t need.

What we build

Native Android & iOS

Performant apps built per platform when maximum smoothness and device access matter.

Cross-platform apps

One codebase, two platforms — React Native or Flutter for faster time-to-market and lower maintenance.

App MVP

A minimal working version to validate with real users before investing in the full product.

Admin panel

A back office to manage content, users and app data, tailored to your processes.

Integrations

Payments, CRM, ERP, third-party APIs and push — we connect the app to your ecosystem.

Release & growth

Google Play & App Store release, monitoring, maintenance and data-driven iterations.

How we work

1. Discovery

A workshop to set the goal, scope and key features. You leave with a concrete plan and estimate.

2. UX/UI design

Wireframes and design you approve before any code is written — no surprises.

3. Development

We build in short iterations, regularly showing working versions.

4. Release & growth

Store release, monitoring and further growth based on user behaviour.

Technologies

React NativeFlutterSwiftKotlinTypeScriptNode.jsREST / GraphQLFirebaseAWS

Frequently asked questions

How much does a mobile app cost?+
It depends on scope, integrations and platforms. We usually start with a clearly scoped MVP to deliver value fast. We’ll prepare a range for your case during a free consultation.
Native or cross-platform?+
For faster time-to-market and lower maintenance with one codebase for Android and iOS, cross-platform (React Native/Flutter) usually wins. We go native when peak performance or deep device access is required.
How long does an MVP take?+
Typically a few to several weeks depending on complexity. We deliberately limit an MVP to core features to validate the idea quickly.
Can the app run on Android and iOS?+
Yes. With cross-platform we ship to both platforms from a single codebase while keeping a native look and performance.
Do you handle release and maintenance?+
Yes — we publish to Google Play and the App Store and provide monitoring, maintenance and ongoing product growth.

Got an app idea?

Tell us about it — we reply within 24 hours and help you scope and price the project.

✓1. Discovery
✓2. UX/UI design
✓3. Development

Tell us about your project

Fields marked with * are required.

By submitting the form you accept our Privacy Policy.

Outpace the competition

Let's talk about your project — together we'll turn goals into finished solutions.

Become a client→
Just Site

A software house from Poznań — we build modern, scalable software for growing companies across Poland.

Company
HomeServicesProjectsBlogAboutContact
Services
Software developmentAIDevOpsDesignMarketing
Contact
Just Site sp. z o.o.
62-070 Dąbrówka
ul. Widok 13
NIP: 7773412524
KRS: 0001058511
+48 573 996 246[email protected]
We also cover
Software house in PoznańMobile team in PoznańOur office near PoznańMobile apps
Privacy Policy© 2026 Just Site sp. z o.o. · All rights reserved.
Trusted partners
ovh.webp
gcloud.webp
aws.webp
vercel.webp