OfflineX

OfflineX is an offline currency converter supporting over 100 global currencies. It allows you to manually input and cache exchange rates for use without internet connection.
MAIN FEATURES
100+ Currencies
Supports major currencies including CNY, USD, EUR, JPY, GBP, HKD, AUD, CAD, SGD, KRW, INR, THB, CHF, SEK, NOK, RUB, BRL, MXN, ZAR, and more. Each currency includes symbol, full name, ISO code, and country information.
Complete Offline Operation
All functionality works without internet. No network requests are made. All data is stored locally on your device.
Exchange Rate Management
Input rates from trusted sources like banks, financial websites, or payment apps. The app automatically caches rates for each currency pair. Cached rates persist across restarts. When a rate is older than 72 hours, a warning icon appears to remind you to update it.
Instant Conversion
Results update as you type. Numbers display with thousand separators (e.g., 1,000,000). Choose between 2 or 4 decimal places. Maximum amount: 999,999,999.99. Tap the swap button to instantly exchange currencies and invert the rate.
Favorites
Bookmark up to 10 frequently used currencies. They appear at the top of the selector for quick access.
Conversion History
Automatically saves up to 20 recent conversions with timestamp, currency codes, amounts, and rates. Tap any record to restore those settings. Delete individual records or clear all at once.
Customization
Three themes: Light, Dark, or System Follow. Material Design 3 interface. Toggle decimal precision between 2 and 4 places. Clear cached data or reset all settings with confirmation dialogs.
USE CASES
Travel: Plan budgets, calculate expenses offline, track spending in home currency.
Shopping: Convert prices from international retailers, calculate total costs, compare deals.
Business: Quick conversions in meetings, invoice calculations, budget planning, expense reports.
Finance: Track foreign investments, calculate remittances, manage multi-currency savings.
HOW TO USE
1. Select source and target currencies
2. Tap the exchange rate to input current rate
3. Enter amount to see instant result
4. Save to history if needed
5. Rate is cached automatically
Get exchange rates from: banks, payment apps (PayPal, Alipay), search engines (Google), financial sites (XE.com, Investing.com), or exchange services.
INTERFACE
Main screen shows two currency cards with amount input/output and exchange rate display. Bottom navigation provides access to Convert, History, and Favorites sections. Currency selector includes search bar for filtering by name, code, symbol, or country.
PRIVACY
• Zero network activity
• All data stored locally
• No tracking or analytics
• No advertisements
• No registration required
• Minimal permissions
TECHNICAL DETAILS
Built with Flutter framework. Uses Hive for local storage and Provider for state management. History limited to 20 records (~4KB total). Favorites capped at 10 currencies. Instant loading with no network delays.
TIPS
Add frequently used currencies to favorites
Update rates regularly for accuracy
Use history to track conversion patterns
Adjust decimal precision as needed
Enable dark mode for low-light viewing
Version: 1.0.0 | Android 5.0+ | ~45 MB | Finance Category
## What's New
Version 1.0.0 - Initial Release
100+ global currencies
Manual rate input with caching
72-hour expiration alerts
History (20 records max)
Favorites (10 currencies max)
Real-time conversion
2 or 4 decimal precision
Light/Dark/Auto themes
Material Design 3
Complete offline mode
## Category
Finance
## Content Rating
Everyone