Open your ASB app and tap Spend Tracker. It might tell you that groceries came to $612 last month, laid out in a clean chart with everything sorted into tidy categories (1). Useful. There's a problem, though. If the other half of the weekly shop went through a Westpac account, that $612 is light by a few hundred dollars, and the ASB app will never once mention it. It can't. It has never seen the Westpac card.
Banks are renowned for doing the bare minimum, and only when they are forced to. Hence, their customer-facing apps are thin, providing enough value to make them seem valuable, but very quickly you realise they're only scratching the surface of what you actually need.
The problem is they do not have the full picture. Whilst you might have had your ASB account since you were six years old, it is not the only financial institution where you keep your money. 80% of the people we surveyed are not with one single bank.
To make smart, educated financial decisions, you need the full picture, which means you need to see all of your finances in one place.
Bank insights got good
Credit where it's due. The in-app spending tools have come a long way. ASB's Spend Tracker sorts your transactions on its own using a machine-learning model, lets you recategorise a payment with one tap, and plots a month-by-month graph of money in and money out (1). Westpac runs a companion app called CashNav that links to your Westpac accounts and cards and buckets your spending as it lands (2). ANZ and BNZ fold their own breakdowns into their main apps.
Bank everything through a single bank and that might be all you need. The tools cost nothing, they're already switched on, and they live inside an app you open anyway.
The catch is structural, not technical
Here's the bit no feature page will tell you. Your bank's insights can only ever see your bank. CashNav proves the point by accident: it's a whole separate app, and it plugs into Westpac and nowhere else (2). Your ASB Spend Tracker has no idea your ANZ offset exists. Your ANZ breakdown can't see the joint card sitting over at BNZ.
If you're a one-bank, one-account household, none of that touches you. Most established families are not that, though. Picture a fairly ordinary Auckland setup: everyday spending with ASB, a mortgage that shifted to ANZ two years back when the rate looked sharper, a shared credit card doing the rounds, and one partner still loyal to the bank they've had since university. Four apps. Four confident, tidy totals. Not one of them can see past its own bank's edge.
The four categories that split across banks
Some spending sits neatly in one account. The lines that matter most to a household budget tend not to. Groceries split the moment two adults shop on two cards. Childcare might leave one account while the after-school stuff comes off another. Petrol goes on whoever happens to be driving that week. Subscriptions cling to whatever card was in your hand the day you signed up, then quietly stay there for years.
Those are the exact figures you'd want a straight answer on. They're also the ones a single bank is worst placed to give you, because they're the most likely to be paid from more than one account.
The quieter problem: whose category is right?
Split totals are the obvious problem. The quieter one hides underneath. Each bank runs its own categorisation model, so the same purchase can land in a different bucket depending on which app you happen to open first. Your weekly supermarket run shows up as Groceries here, Everyday there. Service stations that sell pies and coffee alongside the petrol get miscoded constantly. Once your spending is scattered across banks, you're not only adding up half-totals. You're trying to make two or three category systems agree, and they were never built to.
What you end up with is a figure that looks precise and isn't. A precise wrong number is arguably worse than a roughly right one, because you believe it.
What SortMe rebuilds
Closing that gap is the whole reason SortMe exists. It links to your accounts across every bank you use through open banking and pulls the lot into one view. Your ASB spending, your Westpac spending, your partner's account at some third bank: three separate stories collapse into one household total you can trust.
And it doesn't stop at your bank accounts. The same view pulls in the rest of your financial life: your Kernel and Sharesies investments, your KiwiSaver balance, and the liabilities a spending app never bothers with, like the car loan sitting quietly against your name. Assets and debts, everything in one place, so you're not weighing up a purchase or a savings goal against one slice of your money. You're looking at the whole position, which is the only footing solid enough to make good decisions from.
On top of that, one categorisation engine runs across the whole lot, so Groceries means the same thing whether the money left your ASB account or your partner's Kiwibank one. Rename a category, reshape it, make it match how your household actually talks about money instead of how a bank's model guessed, and it holds everywhere. That's the ground a single-bank tool can't reach. Your Safe to Spend for the week starts counting every account rather than a fraction of them, the Cashflow Health Score reads off your whole position rather than one corner of it, and those three separate app totals finally become a single household number worth trusting.
Charlotte Barraclough, Chief Customer Officer at SortMe, describes the pattern this way: "The moment that lands for people is when they see their two banks side by side for the first time. They've trusted one app's numbers for years without questioning them. Then the full total turns up and it's often a few hundred dollars a month off what they assumed. That isn't a budgeting failure. Nobody had ever shown them the whole thing."
SortMe is read-only, so it reports on your money without ever moving it. The job is to make the full picture legible, in one place, so the calls you make rest on a number that's complete.
When you genuinely don't need it
One honest caveat, because it matters. If your household runs entirely through a single bank and one or two accounts, your bank's own Spend Tracker or CashNav has you sorted. You're not the person leaking money to a blind spot, and a second app would be overkill.
The ten-second test
Count the banks your household's money moves through in a normal month. One, and your bank app has you covered. Two or more, and the confident total on your screen is missing whatever's happening on the others. No update to that app will fix it, because the limit was never the software. It's the wall between one bank and the next.
New Zealand is slowly pulling those walls down. Open banking rules took effect in December 2025, with ASB, ANZ, BNZ and Westpac now required to share your data securely once you give the nod, and Kiwibank phasing in across 2026 (4). The plumbing to see your whole financial life in one place is being laid. SortMe is where you can already stand and look at it.
If your money runs through more than one bank, you can see the real, combined picture in a few minutes. Start a 7-day trial for $1 and connect your accounts.
This article is general information about budgeting tools, not personalised financial advice. Bank app features change; check each bank's current app for the latest.
Sources
- Spend Tracker, ASB (automatic machine-learning categorisation, recategorise transactions, month-by-month spending graph) — asb.co.nz
- CashNav, Westpac NZ (companion app that connects to your Westpac accounts and cards and groups spending into categories) — westpac.co.nz
- ANZ vs ASB vs BNZ vs Westpac, MoneyBalance (NZ big-four bank apps compared; in-app spending breakdowns) — moneybalance.co.nz
- Open banking regulations now in force, MBIE (in force 1 December 2025; ASB, ANZ, BNZ, Westpac designated as data holders; Kiwibank phasing across 2026) — mbie.govt.nz
