CardWin
iPhone / Utilitaires
Got multiple credit cards but never sure which one to use?
CardWin solves this. Just enter the billing day and due day for each of your credit cards, and CardWin automatically calculates which card gives you the most interest-free days for any purchase today.
Open the app each day to instantly see your recommended card, how many interest-free days you get, and when payment is due. No mental math, no spreadsheets -- just one clear answer every morning.
-- Key Features --
Daily Recommendation
See which card to use today at a glance. The recommended card, interest-free days, and due date are displayed prominently on the home screen with a beautiful card interface.
Card Management
Add all your credit cards with their billing and due dates. Supports both same-month and next-month due date configurations to accommodate different banks and billing rules.
Optimization Calendar
View daily card recommendations for the next 30 days. See a full 365-day annual distribution chart showing how often each card is recommended and total interest-free days accumulated per card throughout the year.
Home Screen Widgets
Small and medium home screen widgets let you check today's best card and interest-free days without even opening the app. Widgets update automatically at midnight to stay accurate.
Dual Themes
Choose between two beautifully designed color themes -- a deep navy blue or a vibrant coral pink -- to personalize your experience.
Bilingual Interface
Full Chinese and English language support, switchable anytime in settings.
iCloud Sync
Your card data syncs automatically via iCloud across all your devices. Switch phones without losing anything.
-- Why CardWin --
Precise: Correctly handles month boundaries, varying month lengths, leap years, and all edge cases in billing cycle calculations.
Simple: No complicated setup. Add a card with its billing day and due day, and you are good to go.
Private: All data is stored locally on your device and in your personal iCloud account. No data collection, no third-party analytics, no tracking whatsoever.
Ad-free: A completely clean experience with no ads, no pop-ups, and no in-app purchases.
Polished: Modern iOS design with smooth animations, haptic feedback, and an interface that feels right at home on your iPhone.
Whether you carry two cards or ten, CardWin helps you make the smartest choice every single day and stretch your interest-free period to the maximum.
