# Holdapp

> Holdapp is a mobile and web app development company based in Wrocław, Poland. We build iOS and Android apps using Swift, Kotlin, Flutter, and Kotlin Multiplatform. We support clients at every stage: from product discovery and UX design to development, QA, and staff augmentation.

## Services

- [Mobile App Development](https://www.holdapp.com/services/mobile-apps-development): Native iOS (Swift) and Android (Kotlin) apps, as well as cross-platform apps with Flutter and Kotlin Multiplatform.
- [Web App Development](https://www.holdapp.com/services/web-apps-development): Custom front-end and back-end solutions using PHP, Node.js, and React.js.
- [Web & Mobile UI Design](https://www.holdapp.com/services/web-mobile-ui-design): User interface design for mobile and web products.
- [Product Design Workshops](https://www.holdapp.com/services/product-design-workshops): Planning product roadmaps and choosing suitable technologies before development begins.
- [App Strategy: UX Research & Product Discovery](https://www.holdapp.com/app-development-strategy-ux-research-and-product-discovery): Helping clients define what to build and why before writing code.
- [UX Audit](https://www.holdapp.com/services/user-experience-audit): Evaluating existing products for usability and experience issues.
- [Code Audit](https://www.holdapp.com/services/code-audit): Reviewing existing codebases for quality, security, and maintainability.
- [QA Testing Services](https://www.holdapp.com/services/qa-testing-services): Quality assurance for mobile and web applications.
- [Staff Augmentation](https://www.holdapp.com/services/staff-augmentation): Extending client development teams with experienced engineers.
- [Rappid Workflow](https://www.holdapp.com/app-development-rappid-workflow): An accelerated app development process for delivering m-commerce apps faster and at lower cost.

## Technologies

- [iOS Apps (Swift)](https://www.holdapp.com/services/mobile-apps-development/ios-apps)
- [Android Apps (Kotlin)](https://www.holdapp.com/services/mobile-apps-development/android-apps)
- [Flutter (cross-platform)](https://www.holdapp.com/services/mobile-apps-development/cross-platform-apps-development/flutter)
- [Kotlin Multiplatform](https://www.holdapp.com/services/mobile-apps-development/kotlin-multiplatform-apps)
- [Native App Development](https://www.holdapp.com/services/mobile-apps-development/native-apps)

## Industries

- [iGaming & Sports Betting](https://www.holdapp.com/sports-betting-app-development)
- [Casino Apps](https://www.holdapp.com/services/casino-app-development-services)
- [eCommerce & M-Commerce](https://www.holdapp.com/services/ecommerce-app-development-services)

## Selected Projects (Case Studies)

- [forBET](https://www.holdapp.com/projects/forbet): Native sports betting app for one of the leading bookmakers in Poland.
- [Answear](https://www.holdapp.com/projects/answear-online-fashion-store): M-commerce app for a major online fashion retailer with 400+ brands.
- [LeggUP](https://www.holdapp.com/projects/leggup-personal-development-app): App for coaching and therapy sessions, focused on employee wellbeing.
- [Homla](https://www.holdapp.com/projects/homla-app-home-decor): Mobile shopping app for furniture and home decor.
- [trans.INFO](https://www.holdapp.com/projects/transinfo): Native Android app for a logistics and transport news platform with 1.5M monthly readers.
- [CoinDeal](https://www.holdapp.com/projects/coindeal): Native iOS & Android apps for a cryptocurrency exchange platform.
- [Sprzedajemy.pl](https://www.holdapp.com/projects/sprzedajemypl): Native marketplace apps for individual buyers and sellers.
- [WroDwarf](https://www.holdapp.com/projects/wrodwarf-outdoor-game-app): Flutter web app — an outdoor city game for children set in Wrocław, built for the City of Wrocław.
- [SmartTry](https://www.holdapp.com/projects/smarttry-app): Android tablet app for fitting rooms that uses RFID to recognize products and help customers find clothes in the right size and color, built for Answear and PRM Concept Stores.
- [Medicine](https://www.holdapp.com/projects/medicine-fashion-e-commerce-app): Fashion m-commerce app for iOS and Android built with Kotlin Multiplatform and native UI (SwiftUI + Jetpack Compose).

## Blog

Holdapp publishes articles on mobile development, UX design, QA, Flutter, Swift, Kotlin, m-commerce, and AI integration in apps.

- [Blog index](https://www.holdapp.com/blog)
- Categories: [UX Design](https://www.holdapp.com/blog/category/ux-design), [Flutter](https://www.holdapp.com/blog/category/flutter), [iOS](https://www.holdapp.com/blog/category/ios), [Android](https://www.holdapp.com/blog/category/android), [Quality Assurance](https://www.holdapp.com/blog/category/quality-assurance), [Business Tips](https://www.holdapp.com/blog/category/business-tips), [Development](https://www.holdapp.com/blog/category/development), [M-Commerce](https://www.holdapp.com/blog/category/m-commerce)

## Company

- [About us](https://www.holdapp.com/about-us)
- [Projects / Portfolio](https://www.holdapp.com/projects)
- [Careers](https://www.holdapp.com/careers)
- [Contact](https://www.holdapp.com/contact)
- [Get a quote](https://www.holdapp.com/estimation)
- Location: Wrocław, Poland
- Awards: Mobile Trends Awards 2021 (Everyday Life), Legal Bookmakers Award 2019 (Best Mobile App), Mobile Trends Awards 2025 (M-Commerce Development)