How Runway works
Runway is a local-first cash-flow forecaster for your own money: enter your balance and the income and expenses you expect, and it projects forward across the next 45 to 365 days to show your lowest point — the dip — before you reach it.
It runs in your browser with no account; your figures stay on this device and are never sent anywhere, so only you can see them.
Getting started
- Set your balance. Enter your cash on hand and press Sync — that's your baseline.
- Add income and expenses. Add each one with add income or expense; the ± button flips between money in and out.
- Pick a horizon. Look 45, 90, 180, or 365 days ahead.
- Read the timeline. Each row is a day with your running balance; the lowest is your dip.
- Act on the dip. If it stays comfortably above your reserve, you have room to spend or save the difference. If it falls below — or near zero — treat it as an early warning and adjust while you still have time: trim or delay an expense, bring income forward, or set a little aside now. The point is to see the low point coming, not meet it by surprise.
Frequently asked questions
Is my data private, and who can see it?
Everything stays in this browser, on this device — no account, no server, nothing uploaded, so only you can see it. The single network call it makes reads the current time and carries none of your data. Clearing your browser data erases your plan, so back it up if it matters.
What is the reserve, and do I need one?
The reserve is a line you'd rather not drop below — rent, bills, essentials, plus a little room for surprises. It's a small alarm threshold, not your whole emergency fund. Runway flags any projected day that falls beneath it. Setting one is optional; leave it at zero and the forecast still works.
What is the dip?
The dip is the lowest your balance is projected to reach over the window you're viewing. A comfortable balance today can still sink mid-month once rent and bills land — the dip is the number that warns you first, so you can decide whether a purchase now is genuinely affordable.
When do recurring events fall, around month-end?
A recurring event repeats on a cadence you set — every day, week, month, or year, or every few of them. For monthly events anchored to a month-end, Runway clamps to the last valid day: the 31st becomes Feb 28 (or 29 in a leap year), then Apr 30, and so on, without skipping a month. You can also adjust or skip a single occurrence without touching the rest of the series.
Why does it say "Updated to today"?
When you open Runway on a new day, it rolls your baseline forward to today and folds any events that have already passed into your starting balance, so the forecast always begins from now. Past one-off events are tidied away once absorbed; recurring ones keep projecting. Nothing is lost — your balance simply catches up to the present.
How do I back up my data or move it to another device?
Open the chevron next to your balance and choose Back up to download a JSON file containing everything. To move to a phone or another computer, transfer that file however suits you — a cloud drive, an email to yourself, a repo — and choose Restore there. Restore replaces what is currently in Runway rather than merging it, so you will see a summary of the backup and confirm first.
What currency does Runway use?
Runway shows no currency symbol — amounts are plain numbers grouped with dots (35.000.000), with no decimals, so you can read them as whatever currency you keep your money in. The built-in sample is in Vietnamese đồng; your own entries are simply numbers.