Budget app for multiple currencies: what actually matters (2026)

A good budget app for multiple currencies does three things: it keeps every account in its own currency, it stores each transaction with the amount you actually paid, and it adds everything up into one main currency at a current exchange rate. Lunch Money and PocketSmith work this way, and so does the app I build. YNAB and Monarch Money don't: YNAB asks you to run a separate plan per currency, and Monarch shows everything as dollars without converting. Below are the five tests worth running on any app, a worked example in USD, EUR and GBP, and an honest comparison with prices checked on 6 Oct 2026.

Why one-currency apps break when your money lives in three

Most budgeting apps were built for someone who is paid, saves and spends in a single currency. Add a second one and small lies creep in:

• The total is wrong. An app that doesn't convert shows USD 4,850 plus EUR 2,310 as "7,160". That number means nothing.
• Spending looks bigger or smaller than it was. A USD 64 software subscription logged as 64 in a euro budget is overstated by about 12% at today's rates.
• Transfers look like spending. Moving USD 1,000 from Wise to your euro account becomes "−1,000 here, +893 there", and the 107 gap shows up as a mystery expense.
• Your balance drifts when you did nothing. If the dollar weakens, your USD savings are worth fewer euros. A one-currency app either ignores this or forces you to "fix" it by hand.

Workarounds exist. YNAB's own help center recommends creating a separate plan for each currency, and people bolt on third-party converters such as Multi-Currency for YNAB. Monarch's help page says plainly that the app displays everything with the $ symbol and does not perform any currency conversion. Both are fine apps for a one-currency life. For a three-currency life, you end up doing the conversion in your head.

Five tests for a multi-currency budget app

Before you pay for anything, open the trial (or the demo — Needt's is at /demo) and check these five things. They take ten minutes.

1. Each account keeps its own currency

Create a USD account and a EUR account. The USD one should show dollars, always — not a converted figure. Your Wise USD balance is a dollar balance; if the app can't show it as one, you can't check it against the bank.

2. A purchase keeps its original amount

Log a GBP 18.40 purchase from a EUR account (say, a train ticket in London paid by a euro card). A good app records both: GBP 18.40 as the original amount and the converted euros. When the bank statement arrives with the real euro figure, you can see where the difference came from.

3. One total in your main currency

Pick a main currency — the one you think in, usually where you pay rent. The app should add every wallet into that one number. This is the number you actually need: "how much do I have?"

4. It tells you which rate it used, and when

Exchange rates move every working day. Central bank reference rates, for example, are published once a day, around 16:00 CET, by the ECB — and the ECB says they are for information only, not for transactions. Your card or bank will use its own rate. So a budget app's total is always an estimate. The honest ones say so: they use a recent daily rate and flag it when the rate is stale, instead of silently showing last week's number.

5. Transfers between currencies are not spending

Move money from a USD account to a EUR account. The app should treat it as a transfer — two linked rows — not as an expense in one account and income in the other. Otherwise your "spending" for the month includes money you merely moved.

If an app fails test 3 or test 5, no amount of good design will make it work for a multi-currency life.

A worked example: one person, three currencies

Here's a neutral example. Alex is a freelance designer living in Lisbon. A US client pays in dollars, rent is in euros, and there's an old savings account in pounds from a few years in London.

Example rates (rounded, close to rates in early October 2026 — not live): 1 USD = 0.8929 EUR, 1 GBP = 1.1765 EUR. Main currency: EUR.

Alex's month, in euros: rent EUR 1,150, groceries at Lidl EUR 380, transport EUR 90, everything else EUR 520 — plus USD 64 of software subscriptions paid from the dollar account. That's about EUR 2,197 a month, or EUR 73.24 a day (counting a 30-day month).

Divide the total by the daily spend and you get Alex's runway: about 139 days before the money runs out with no new income. That one number is the reason to budget across currencies at all. A freelancer with irregular payments cares less about "did I stay under the groceries budget" and more about "how long can I go if the next invoice is late?"

Now the part one-currency apps hide. Say the dollar weakens by 5% against the euro over a month. Alex spends nothing differently, but:

• the USD wallet is now worth about EUR 4,114 instead of EUR 4,331;
• the total drops by EUR 216.53;
• runway drops from 139 days to 136 days.

Three days of runway disappeared without a single purchase. A good multi-currency app shows this as a change in value, not as spending — and lets you see it.

Two smaller leaks in the same example (illustrative fees, check your own card and bank):

• If a card charges a 2.75% foreign-transaction fee, the USD 64 of subscriptions costs an extra USD 1.76 a month.
• If a bank converts the USD 4,850 invoice at a rate 1.5% worse than the mid-market rate, that's about EUR 65 gone on one conversion.

Neither shows up in a budget that only tracks "Software: 64". An app that keeps the original amount next to the converted one (test 2) is how you catch them.

How the main apps compare

Prices are from each company's own pricing page, checked on 6 Oct 2026, in USD.

Lunch Money is the strongest pick if you want automatic bank feeds (included in the price) and like a tracking-first approach. Its multi-currency page is the real deal: a primary currency, daily rates, and history. It costs 25–30 times as much as a $4-a-year app, and it's worth it if bank sync matters most to you.

PocketSmith is the best choice if you want to forecast years ahead: its plans include projections of 10 to 60 years, depending on the tier. The catch for expats: the cheaper Foundation plan connects banks from one country only, so a two-country life usually means Flourish at $16.66/month billed annually.

YNAB is still the best envelope-budgeting method if all your money is in one currency. If you have a second currency, its own guide suggests a second plan — which works when the two lives are separate (say, a home-country account you rarely touch), and gets painful when money moves between them every month.

A spreadsheet with GOOGLEFINANCE("CURRENCY:USDEUR") handles conversion for free and is the right answer if you enjoy building things. The cost is your time: categorizing, transfers and the original-versus-converted amount are all on you.

Where Needt Budget fits

This is the app I build, so weigh this section accordingly.

It passes the five tests above: every wallet keeps its own currency, a spend in another currency keeps its original amount, and totals convert into your main currency with daily rates — with a note when a rate is stale. It shows one balance and your runway: the "139 days" from Alex's example, worked out from what you really spend per day.

What it doesn't do matters as much. It has no automatic bank sync except for PostFinance in Switzerland; everywhere else you add rows by hand, and there is no CSV import. There's no free trial either — it's $4 a year, or $19 once for lifetime access while founder seats last. If you want your Chase, Revolut and N26 transactions to arrive on their own, Lunch Money or PocketSmith will serve you better.

Where it fits: you'd rather log 3–5 things a day yourself, you live across two or three currencies, and the question you ask most is "how long does my money last?"

You can click through it on sample data without signing up — nothing is saved — or work out your own runway with the free runway calculator.

Setting up a multi-currency budget in any app

Whatever app you choose, the same setup works:

1. Pick one main currency. The one you pay rent in. Reports, goals and runway all live in it.
2. One account per real account. Wise USD, N26 EUR, Revolut GBP — each in its own currency, each matching the bank to the cent.
3. Log the amount the bank charged, and the original amount when it differs. That's how you spot fees.
4. Mark transfers as transfers. USD → EUR is not spending.
5. Reconcile monthly. When the app and the bank disagree by a few cents or euros, record the difference as an adjustment. Don't edit old transactions to make it fit.
6. Watch the total, not each wallet. One number in one currency is what tells you how you're doing.

FAQ

Does YNAB support multiple currencies?

Not inside one budget. YNAB's help center recommends a separate plan for each currency, plus a "Currency Transfer" category if you move money between them. Third-party tools such as Multi-Currency for YNAB can convert foreign accounts into your plan's currency.

Which exchange rate should a budget app use?

A recent daily rate is right for totals — your balance is an estimate anyway until you convert. For individual purchases, the amount your bank actually charged is the truth; the app should keep that and the original amount side by side.

Should I budget in my home currency or where I live?

Where you pay rent and buy groceries. That's the currency your daily spending is in, so your categories and runway make sense without mental conversion. Keep home-country accounts as wallets in their own currency.

Why did my total change when I didn't spend anything?

Exchange rates moved. In the example above, a 5% weaker dollar cut about EUR 217 from the total and three days from runway. A good app shows this as a change in value, not as an expense.

Is a spreadsheet enough?

Yes, if you're disciplined and like maintaining formulas. It's free and fully flexible. Most people switch to an app when categorizing and transfers start eating their weekend.