ZeroDay: No-Spend Tracker

Make space for a no-spend day.

ZeroDay is a no-spend and spending journal for adults aged 18 and over. Check in when you spend nothing, record spending when you do, and build a routine with Mungchi.

A SIMPLE DAILY RECORD
Hold to check in, or enter a spending amount, category and optional note. Look back at no-spend, spending and rest days in the calendar. Recent records can be corrected within the app’s seven-day editing window.

ESTIMATED SAVINGS, CLEARLY EXPLAINED
Choose your usual daily spending as a baseline. On no-spend days, ZeroDay adds that amount to an estimated savings total and goal progress. These figures are based on your entries. They are not real account balances, money held by the app or guaranteed savings. ZeroDay does not provide banking, payments or financial advice.

ONE DATASET, ONE CURRENCY
Choose KRW, USD, CAD, AUD, GBP, JPY, TWD or HKD before creating financial records. Amounts retain their selected currency when you change languages. Existing Korean records stay in KRW. There is no foreign-exchange conversion or automatic bank/card linking.

A ROUTINE WITH PERSONALITY
Keep a streak, use a rest-day card when eligible, set a goal and collect badges. Mungchi grows with your no-spend days. Explore accessories, skins, monthly statistics and spending categories at your own pace.

LOCAL RECORDS, VOLUNTARY SHARING
No account, login or record server. Your records stay on your phone, with Android automatic backup and device transfer disabled. Export CSV records or make a share card when you choose; nothing is automatically uploaded or shared. CSV files include currency and precise amounts and are not an in-app restore backup. Deleting the app or losing your phone can mean losing records.

ADS AND REWARDS
The app contains Google AdMob banner and rewarded ads. Optional rewarded ads can provide an extra rest-day card, skin progress or access to the current month’s report. Rewards are app features, have no cash value and depend on completion and availability. Google may process advertising identifiers, IP-derived approximate location, ad interactions and diagnostics; spending records are not sent to the advertising SDK.

REMINDERS AND COMFORT
Set check-in reminders and morning encouragement, use light or dark mode, and reduce motion or vibration. Reminders depend on Android permissions, battery restrictions and background operation and may arrive late or not at all.

Support: [email protected]