Koin: Budget & Expense Tracker

Koin is a budget and expense tracker that lives only on your phone. No account, no ads, no internet permission. You type in what you spend and earn, and it tells you what is left. Adding something takes a few taps: amount, category, date, and a note if you want one. WHAT IT DOES - Home shows your balance, what you spent this month, and roughly how much you can spend per day until the month ends. - Activity has a calendar, a list, and Insights with totals per category. - Categories and subcategories are yours to rename, with your own icons and colours. - Plans let you set a budget per category and decide how the rest of your income is split. Apply a plan for the month with one tap, or let Koin do it on the day you pick. Undo puts the month back. - Funds are separate pots of money. Spending is your everyday money; Savings and any funds you add hold money for later. Moving money between funds is not counted as spending or income. - Yearly costs like insurance or tyres get a monthly amount to put aside. When the bill arrives you mark it paid and Koin records it once. - Recurring items, like salary or rent, are added on their day. - A PIN lock, with fingerprint or face unlock if your phone has it. - Hide all amounts with one switch. - Backup to a file and restore from it. You choose where the file goes, for example Downloads or a cloud folder you already use. - Light and dark theme. - An optional reminder on your plan day. It stays off until you turn it on. GOOD TO KNOW - The currency is only a label (EUR, MKD, USD and so on). Koin does not convert between currencies. - Budgets are set per month. Changing one affects that month and the later ones, never the past. - Koin checks your plan against your income and says so in plain words if you have planned more than you earn. - It is not a bank app. It cannot see your bank account, move real money or give financial advice. - There is no sync between phones in this version. Use the backup file to move your data. PRIVACY Everything you enter stays on your phone. Koin has no permission to use the internet, no analytics and no tracking. Backup files are only made when you ask for one. Profile has an optional "Support our work" card with a public crypto address (SOL and USDC) if you want to leave a tip. Koin does not connect to any wallet; you copy the address yourself.

Track expenses and income, plan each month with budgets and funds, move money between funds, and back up your data to a file you choose. Works offline, with no ads and no account.