Mobile apps · 2026

An app for iPhone and Android — one codebase, two platforms.

We build iPhone and Android apps with React Native, adding Swift or Kotlin modules where needed. Notifications, in-app purchases, deep links, analytics and submission to both app stores are included.

  • One codebase (React Native)
  • Native modules (Swift/Kotlin)
  • App Store + Google Play submission
5.0 · 10+ Google reviews
Payment after stage approval
Quote within 24h
Concept visualisation: Mobile apps.
Example interface · demo data
What you get

Clear commitments, no marketing slogans

Four things always included in a Balance IT mobile app package.

Quote within 24h

Problem brief + personas + scope → quote within 24h with an MVP plan / scope.

You own 100% of the code

React Native repository on your GitHub. You keep the Apple Developer + Google Play accounts.

App store submission

Apple App Store + Google Play review process, screenshots, descriptions, app icon — we prepare it all.

Push + IAP + Analytics

Firebase Cloud Messaging / APNs, StoreKit / Play Billing, Mixpanel / Firebase Analytics — built in from day 1.

iOS · Android · Cross-platform

One app, two platforms.

React Native + native modules for performance-critical features. 80% shared code, 20% platform-specific UX.

Discovery + technology selection (RN vs native vs hybrid)

Development in 1-2-week sprints with TestFlight + Internal Testing

Submission to the App Store + Google Play + team training

Stack
React Native

TypeScript + RN 0.74+. Optional Expo for a fast MVP.

Native
Swift + Kotlin

Native modules for camera, BLE, ARKit and performance-critical features.

Distribution
App Store + Play

Apple Developer + Google Play submission + review process.

Push + IAP
FCM + StoreKit

Push notifications + in-app purchases + receipt validation.

Packages

Three paths, one promise.

Choose the pace and scope — always with a fixed quote before we start. Prices exclude VAT. The amounts shown cover the package scope; extra work requires an agreed scope and a confirmed quote.

Mobile MVP

App MVP

from 35 000 PLN excluding VAT

Implementation: 6-8 weeks

  • 1 platform (iOS or Android) OR cross-platform, 5-7 screens
  • Auth + 1 core feature
  • TestFlight / Internal Testing
  • 30 days of support
Choose App MVP
Most popular
Full cross-platform app

App Standard

from 78 000 PLN excluding VAT

Delivery: 10-14 weeks

  • Full cross-platform app (iOS + Android)
  • Push + IAP + analytics
  • Deep linking + universal links
  • Submission to the App Store + Google Play
  • 60 days of support
  • Everything in App MVP
Book a slot
Custom native app

App Custom

Quote custom

Delivery in 4-6 months

  • Separate native iOS (Swift) + native Android (Kotlin) apps
  • Advanced features (AR / BLE / video / WebRTC)
  • Custom backend (Node + Postgres)
  • Dedicated team + ongoing iteration
  • Everything in App Standard
Let's talk
Tech stack

Under the bonnet of a mobile app.

Proven tools, no experiments. Each module can be replaced — it is your app, not a closed system.

Stack

React Native + Expo

End-to-end TypeScript. RN 0.74+ + Expo for an MVP, or a bare workflow for custom native modules.

React Native Expo TypeScript Hermes
Native

Swift + Kotlin modules

Native modules for camera, BLE, ARKit, ML Kit and performance-critical work. 80% RN, 20% native.

Swift Kotlin Native modules Bridge
Push

FCM + APNs

Firebase Cloud Messaging for cross-platform apps. Push notification flows + deep linking. Notifee for local notifications.

FCM APNs Notifee OneSignal
IAP

StoreKit + Play Billing

Subscriptions, consumables, non-consumables. Server-side receipt validation. Optional RevenueCat for cross-platform billing.

StoreKit 2 Play Billing RevenueCat Receipt validation
Analytics

Firebase + Mixpanel

User events, funnels, retention cohorts, A/B testing (Firebase Remote Config). Crashlytics for errors.

Firebase Analytics Mixpanel Crashlytics Remote Config
Deep links

Universal + App Links

iOS Universal Links + Android App Links. Branch / Firebase Dynamic Links available for referrals + attribution.

Universal Links App Links Branch Firebase Dynamic
An application project

What we agree before starting

We review these questions with you before we confirm the scope and deliverables.

Scope and handover

Questions to discuss

What should a user be able to complete in the first release?

Who is responsible for data, access and integrations?

What acceptance criteria must the working release meet?

How will we hand over code, documentation and agreed support?

Access and responsibilities
Schedule and reviews

The Balance IT standard

How we work with clients

Fixed quote before we start

Brief + scope → quote within 24h. No extra charges for “changes along the way”.

Push + IAP included

FCM + APNs + StoreKit + Firebase Analytics — built in from day 1, not an add-on.

App store submission

App Store + Google Play review process, screenshots, descriptions — prepared with you.

You own the repo + accounts

React Native repository + Apple Developer + Google Play accounts in your name. You can switch providers.

See how we do it
Our Strengths

Why do clients choose us?

Four concrete reasons why Balance IT apps stay with customers for longer.

01

React Native (one codebase)

80% shared code for iOS + Android. Native modules (Swift / Kotlin) for performance-critical work where needed.

See the results
02

Submission to the App Store + Play

Screenshots, description, app icon, review process — we prepare everything with you.

See the results
03

Push + IAP + Analytics included

FCM + StoreKit + Firebase from day 1. No add-ons costing thousands later.

See the results
04

You own the Apple Developer + Google Play accounts

Developer accounts in your company's name. Repository on your GitHub.

See the results
Balance IT workflow

From brief to
App Store — four sprints, no surprises.

Each stage ends with a demo and approval. Only then do we invoice and move on.

Step 1
01

Wireframes + technology selection

Weeks 1-2 · scope + stack

  • Personas + JTBD + competitive analysis
  • Wireframes + clickable prototype (Figma)
  • Technology selection (RN vs native, Expo vs bare)
Step 2
02

Build core screens + navigation

Weeks 3-5 · MVP scope

  • Auth + navigation (React Navigation)
  • Core screens (5-10 within scope)
  • TestFlight + Internal Testing alpha
Step 3
03

Push + IAP + polish

Weeks 6-10

$ npx react-native run-ios|
  • Push notifications + deep linking
  • In-app purchases + receipt validation
  • Performance + polish + accessibility
Step 4
04 Finish

App Store + Play submission

Weeks 11-14 · review + launch

  • App Store + Google Play submission
  • Review process (1-7 days for iOS, 2-3 days for Android)
  • Launch + monitoring (Crashlytics + Analytics)
Portfolio

Selected projects

Loading projects...

Who is the mobile app service for?

Small and Medium Businesses Startups E-commerce Stores Public Institutions Personal Brands

Frequently asked questions

Answers to frequently asked questions about mobile apps

How much does implementation cost?
We quote each project individually based on the scope of work. Contact us for a no-obligation proposal within 24h.
How long does a project take?
Simple projects take 2-3 weeks. Online stores and apps usually take 1-3 months. We always agree a schedule before starting.
What do I need to get started?
All you need is an idea and a quick chat. We can help with your domain, server, copy and photos. We guide you through every step.
Trusted by leaders

Reviews that speak
for themselves.

5.0
(19 Google reviews)
Working across Poland — regional coverage