ConvertiX – React Native Expo Unit Currency Converter | iOS Android | i18n | AdMob | TypeScript

ConvertiX is a beautifully designed, production-ready unit and currency converter app built with React Native + Expo + TypeScript . 15+ conversion categories, 170+ live currencies, 8 fully translated languages with complete RTL support, AdMob, RevenueCat IAP, and full favorites & history — all offline. Ship your own converter app to Google Play and App Store in hours, not weeks.

Unit Conversion

✅ 15+ categories: Length, Weight, Temperature, Area, Volume, Speed, Time, Data Storage, Pressure, Energy, Angle, Frequency, Fuel Economy & Cooking
✅ Instant real-time conversion as you type
✅ High-precision results across all categories
✅ Works 100% offline — no internet required

Live Currency Converter

✅ 170+ world currencies supported
✅ Real-time exchange rates fetched automatically
✅ Cached rates for full offline functionality
✅ Includes USD, EUR, GBP, PKR, AED, SAR, CNY, INR and more

8 Languages + Full RTL Support

✅ English, Spanish, Urdu, Sindhi, Hindi, Arabic, Chinese, Bengali
✅ Full right-to-left layout for Arabic and Urdu
✅ Auto-detects device language on first launch
✅ Easy to add new languages — copy one JSON file, register, done

◑ Dark / Light / System Theme

✅ Three theme modes built in
✅ Follows device setting automatically
✅ User can override and lock their preference
✅ Designed to look premium in both modes

⭐ Favorites & History

✅ Pin conversion pairs as favorites for one-tap access
✅ Full conversion history with automatic date grouping
✅ All data stored locally — never sent to any server

▶ AdMob Integration

✅ Banner and interstitial ads pre-wired
✅ Enable globally with a single config flag: enableAds: true
✅ Interstitial frequency configurable (default: every 5 conversions)
✅ Test ad IDs used automatically in development

$ RevenueCat In-App Purchases

✅ RevenueCat SDK fully integrated
✅ Ready for subscriptions, one-time purchases, or premium unlocks
✅ Enable premium features with a single config flag
✅ Payment handled entirely by Apple / Google

Privacy First — 100% On-Device

✅ All user data stored locally using MMKV (fastest RN storage)
✅ No account required. No login. No server. No tracking.
✅ Users can wipe all data from Settings at any time

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What’s Included

✅ Full React Native + Expo source code
✅ TypeScript throughout — clean, maintainable architecture
✅ 8 locale JSON files (EN, ES, UR, SD, HI, AR, ZH, BN)
✅ HTML documentation with step-by-step setup guide
✅ AdMob pre-wired (banner + interstitial)
✅ RevenueCat IAP integration
✅ Expo Router navigation setup
✅ MMKV on-device storage layer
✅ Dark / Light / System theme system
✅ Favorites & history screens
✅ Settings screen with language picker and theme toggle
✅ Live currency rate fetching hook (useCurrency)
✅ Privacy policy & terms pages included

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Tech Stack

⚡ React Native 0.81
⚡ Expo SDK (Expo Router)
⚡ TypeScript
⚡ MMKV Storage
⚡ i18next + react-i18next
⚡ React Native Google Mobile Ads (AdMob)
⚡ RevenueCat
⚡ React Navigation