O - Daily Budget & Expenses

Most budget apps track the past. O manages what's left.
Create a budget — for a trip, a vacation, or until payday. Keep it short: a few weeks works best. Set the name, dates and total, and O divides it into a daily amount. From that moment one number answers the only question that matters: how much can I spend today?

Log expenses in seconds
Three ways to add an expense: for today, for selected days, or spread across the rest of the period. Rent for two weeks? Split it — O deducts a share from each of those days. A coffee? Full amount, today. Add a note, save frequent ones as tags — and daily entry becomes a three-tap habit.

Overspent? The budget adapts
This is what O is built for. Spent more than today's number? Close the day and send the difference forward — spread evenly across remaining days or onto dates you pick. Tomorrow starts with an honest new amount. Saved instead? Your leftover rolls forward the same way. No guilt, no broken budget — just recalculation.

Closed days stay closed
Once you close a day, its expenses lock — nothing in your history can quietly change. Need to fix a mistake in an open day? Edit or cancel any expense: O records the difference as a separate operation, so every number on screen can be traced back to what caused it.

Adjust as life happens
Found extra money? Add it to a single day's limit. Got a bigger budget mid-trip? Raise the total — the difference spreads evenly across the days left. Every change is visible, nothing is silent.

Finish with the full picture
When the last day closes, the budget completes and shows its statistics: a day-by-day chart of what remained, total spent, your biggest expense, your daily average — and the final result, under or over.

Yours, offline, once and forever
Works fully offline: no bank connections, no accounts, no sync.
Your data stays on your device.
A one-time Lifetime purchase is optional: pay once, skip the future subscription, and get all upcoming online features — shared budgets, sync across devices — included forever.

O is made for short budgets: trips, vacations, payday to payday. For anyone who wants to spend without anxiety — and know, every single day, exactly where they stand.
O helps build spending discipline without the spreadsheet — one number a day is all it takes.

O is a simple expense tracker and daily budget planner for travel and everyday life: a spending tracker that plans your money forward instead of reporting it backward.

Just start.