Every shared spreadsheet starts the same way: someone sets it up in week one, color-codes it, adds a formula that auto-calculates who owes what, and everyone's genuinely impressed. Then month three happens, and it's a graveyard of half-filled rows, one column that stopped being updated, and a formula that broke when someone inserted a row in the wrong place.
This isn't because the people using it got lazy. It's because a spreadsheet has three specific failure modes that show up reliably, regardless of who's using it or how organized they are.
Failure mode one: nobody gets notified of anything
A spreadsheet is passive. It doesn't tell you when a flatmate adds an expense, doesn't remind anyone that rent's due in three days, and doesn't flag that the electricity bill hasn't been logged yet. Everything in it only exists if someone actively opens the file and looks - which, in practice, happens less and less as weeks go by, until eventually only one person is still checking it at all.
Failure mode two: formulas break silently
The formula that calculates "who owes whom" is usually built around a fixed number of rows or a specific column structure. The moment someone inserts a row above it, sorts the sheet by date, or accidentally deletes a cell reference, the formula either breaks visibly (a wall of #REF! errors) or - worse - breaks silently and just returns a wrong number that looks plausible enough that nobody questions it for weeks.
Failure mode three: there's no real-time source of truth
When three flatmates each think they remember what the current balance is, and the spreadsheet hasn't been opened in eight days, you get three different informal answers and a small argument about whose memory is right. A spreadsheet's "truth" is only as current as its last edit, and unlike a notification-driven system, nothing prompts anyone to make that edit when it actually matters.
Failure mode four: two people editing at once
Shared spreadsheets are usually edited by whoever happens to have it open, which occasionally means two flatmates editing at the same time without realizing it. One person's editing a cell while another's mid-sort, and a moment later one of their changes has silently overwritten the other's - not because either of them did anything wrong, just because the file has no concept of "these are two different actions that both need to land."
This is rare enough that it doesn't happen every week, which is exactly why it's dangerous - it's rare enough to be forgotten as a risk, and then it happens on the one week it actually matters, right before rent is due.
"But a spreadsheet is free"
This is the real objection, and it deserves a real answer rather than being waved away. A spreadsheet genuinely costs nothing in money. What it costs is time - specifically, the time of whoever ends up being the unofficial spreadsheet maintainer, fixing broken formulas, chasing people to update their rows, and manually recalculating when something looks off. That person's time has a real cost, it's just not one that shows up as a rupee amount, so it's easy to discount.
The honest comparison isn't "free spreadsheet vs. paid app" - BudgPay's core tracking and splitting is free too. The actual comparison is "a system that needs a human maintainer to keep working" vs. "a system where the maintenance is built in," and once you frame it that way, the free-vs-paid argument mostly disappears, because it was never really the deciding factor.
What actually needs to be true for tracking to hold up
Strip away the specific tool and look at what a system needs to survive past month one: it needs to update the moment something happens, not whenever someone remembers to open it. It needs the math to be structurally impossible to break, not held together by a formula anyone could accidentally overwrite. And it needs one number everyone can check independently, at any time, without asking a flatmate to "re-send the sheet."
That's the actual bar - not "prettier than a spreadsheet," but "doesn't quietly stop working the way spreadsheets reliably do."
Where BudgPay actually differs
A shared budget in BudgPay updates the moment any member logs an expense or contribution - there's no file to re-open, because everyone's looking at the same live numbers. The settlement math (who owes whom, simplified to the fewest transfers) is computed fresh every time, not held together by a formula that can be broken by an accidental keystroke. And because it's real, not a passive document, it can actually notify people - a new expense, an invite, a reminder - instead of relying on someone remembering to check.
None of this makes the system "better" in the abstract. It's better specifically at the three things that kill spreadsheets by month three, which is the part that actually matters if you're still splitting rent with the same people in month six.