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.

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App Screenshots

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⚡ Key Features

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

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Requirements

▪ Node.js 18 or higher
▪ Expo CLI (npm i -g expo-cli)
▪ EAS CLI for production builds (npm i -g eas-cli)
▪ Android Studio (for Android builds)
▪ Xcode 15+ on macOS (for iOS builds)
▪ Basic knowledge of React Native / Expo
▪ Google AdMob account (only if enabling ads)
▪ RevenueCat account (only if enabling IAP)

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❓ FAQ

Can I publish this on both Google Play and App Store?
Yes. Built with Expo so it targets both platforms from a single codebase.

Do I need coding knowledge?
Basic React Native knowledge is recommended. The documentation walks through every step from setup to publishing.

How do I enable AdMob?
Set enableAds: true in constants/config.ts and replace the placeholder IDs in constants/admob.ts with your real IDs. That’s it.

Can I add my own language?
Yes. Copy locales/en.json, translate the values, import it in i18n/index.ts and add it to the LANGUAGES array. Full steps in the docs.

Is any user data collected?
No. All data is stored on-device via MMKV. The only third-party data collection is through AdMob and RevenueCat per their own privacy policies.

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Changelog

Version 1.0.0 — March 22, 2026
✅ Initial release
✅ 15+ conversion categories
✅ 170+ live currencies with offline fallback
✅ 8 languages: EN, ES, UR, SD, HI, AR, ZH, BN
✅ Full RTL support for Arabic and Urdu
✅ Dark / Light / System theme
✅ Favorites and conversion history
✅ AdMob banner + interstitial integration
✅ RevenueCat IAP integration
✅ MMKV on-device storage
✅ HTML documentation included

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Note: For questions or issues, use the CodeCanyon comments section. I typically respond within 24 hours. If you enjoy ConvertiX, please leave a rating — it helps a lot. Thank you!