tools · harmony
harmony.
A Google Sheets extension that settles "who owes who" — for couples who share expenses.
Two-minute install via Make-a-Copy. License key sent on purchase. Works offline forever, no subscription.
what's in the box
One-tap expense logging
A sidebar form pre-fills today's date and your default split, previews who owes what, and saves with one click.
Who owes whom, visualized
A single sentence — "Sam owes Alex $42.50" — plus a horizontal balance scale that tilts toward whoever's owed.
Settle as you go
Tick the "Settled" checkbox when a partner pays you back. The dashboard, balance bar, and Settle Up tab repaint instantly.
Self-contained, your data
No app, no logins. Your expenses live in your own Google Drive and never leave it — the only thing harmony ever sends out is a one-time license check.
the long pitch
If you and your partner keep losing track of who paid for groceries, who got the taxi last weekend, whose turn it was to cover dinner — harmony is for you.
It’s a Google Sheets file with a small Apps Script extension. You log shared expenses through a clean sidebar form; it does the math on splits, keeps a running balance, and surfaces a single sentence at the top: who currently owes who, and how much.
When the time comes to settle up, pay your partner back however you usually do, tick the boxes next to the items that were paid back, and the balance returns to zero. No app to download, no account to create, no one’s data sitting on someone else’s server.
What you get
An email with your license key and a Make-a-Copy link. Click the link, hit Make a copy, then open harmony → Activate License and paste your key. You’re set up in about two minutes — nothing to install.
Who it’s for
Couples who share a household and want a low-friction way to keep things even. Roommates. Long-distance friends who keep an open tab. Anyone who’s tired of doing the mental math.
Who it’s not for
If you want a phone app with push notifications and a social feed, you want Splitwise. harmony is deliberately simpler — a spreadsheet you open when you need it, nothing else.
Ready when you are.
S$14.90 once, yours forever. After purchase you'll get a license key and a Make-a-Copy link by email — installs in under two minutes. No subscription. Email support if you hit a snag.
Secure payment via Stripe. All sales final.