Welcome to CrazyCat Lab

Where Quality Meets Creativity

• Flutter Expert • Native Performance • Indie Spirit
Start a conversation See what we build
📍 Based in Korea 📱 iOS & Android 🧪 CI-ready, testable code

Highlights

  • Product-minded development: quick experiments → reliable releases
  • Monetization: AdMob / AppLovin MAX mediation, IAP subscriptions
  • Privacy-first analytics and crash reporting

Lean & Transparent

We share timelines early, cut scope when needed, and ship value in small increments.

Design × Engineering

From wireframes to pixel‑polish: UX flows, UI systems, and implementation under one roof.

Quality by Default

Type‑safe code, lint rules, automated builds, and meaningful monitoring to keep apps healthy.

Cross‑platform Apps (Flutter)

Single codebase targeting iOS and Android with native‑level performance and smooth animations.

Native Android / iOS

Kotlin + Jetpack on Android, Swift + SwiftUI/UIKit on iOS when platform‑specific features matter.

Monetization & Growth

AdMob & AppLovin MAX mediation, in‑app purchases, A/B testing, privacy‑friendly analytics.

Smart HQ App Icon

Smart HQ

Smart home device management app provided by GE (General Electric). Users can easily control and monitor GE smart devices.

Released - Available on US App Store
MyData KKL App Icon

MyData KKL

Personalized financial data integration and asset management service mobile app by Kyobo Securities.

Android iOS
Released - Available on App Stores
Wallypto Beta App Icon

Wallypto Beta

Blockchain wallet developed by LG Electronics, Inc. for secure digital asset management.

Android iOS
Released - Available on App Stores
Cat President App Icon
Dog President App Icon

Cat & Dog President

Pet shopping mall apps featuring cat and dog characters, providing users with a friendly and fun shopping experience.

Released - Available on App Stores
Favoriit App Icon

Favoriit

Innovative secondhand trading platform with instant sales, real-time auctions, and story features for beloved items.

Android iOS
Released - Available on App Stores
StyleSeller App Icon

StyleSeller

Easy and fast SNS product sales platform for side hustlers with free multi-links, recommended products, and data-driven group buying.

Android iOS
Released - Available on App Stores
Water Coach App Icon

Water Coach

Smart Water Tracker. Personalized water goals, smart alerts, and analytics to build healthy hydration.

Android
Released - Available on Google Play Store
Window Close App Icon

Window Close

Fine dust/Ultra-fine dust alerts, Real-time air quality information and weather data.

Android
Released - Available on Google Play Store
Every Calc App Icon

Every Calc

Comprehensive calculator app with multiple calculation modes and beautiful design.

Android
Released - Available on Google Play Store
🌤️

Weather Companion

Smart weather forecasting with personalized insights and beautiful animations.

90% Complete - In Development
💚

Health Tracker

Comprehensive health monitoring with AI-powered insights and goal tracking.

70% Complete - In Development
📱

Daily Life Assistant

Smart daily planner with habit tracking and productivity insights.

70% Complete - In Development
• Kotlin, Java, Dart (Flutter), Swift
• Riverpod, BLoC, GoRouter, Freezed, JsonSerializable
• Dio, Hive/Isar, sqflite, in_app_purchase, intl
• Jetpack Compose, SwiftUI, MVVM, Hilt/Koin
• Retrofit2, Glide, ExoPlayer, Lottie

Mobile Development (Main)

Kotlin Dart (Flutter) Java Swift Riverpod BLoC GoRouter Freezed JsonSerializable Dio Hive/Isar sqflite in_app_purchase intl Jetpack Compose SwiftUI MVVM Hilt/Koin Retrofit2 Glide ExoPlayer Lottie

Server Development (Sub)

Spring Boot + Kotlin Ktor Spring Data JPA Exposed (Kotlin ORM) Spring Security JWT Authentication Gradle Kotlin DSL Coroutines Jackson (JSON) PostgreSQL MySQL Redis REST API OpenAPI/Swagger Spring WebFlux

Web Development

Flutter Web Next.js + React

Cloud & Deployment

Firebase Docker + Docker Compose GitHub Actions (CI/CD) AWS EC2/RDS Google Cloud

Development Tools

Android Studio Xcode IntelliJ IDEA VS Code Git GitHub Postman Figma