A cart abroad says 74.47 USD. You open a search tab for the rate, then a calculator to multiply. Then you remember the same item was 11,471 JPY on a Japanese shop, and the round trip starts again.
The awkward part is not the arithmetic. It is that the tool makes you choose a direction before it will answer. Dotori Currency Converter removes that step.
Type into any row, and the rest follow
The screen is one list of currencies. Enter 100,000 in the KRW row and USD, EUR, JPY, and CNY change together. Move to the USD row, type 100, and everything else follows from there instead.
Whichever row you touch last is the source. There is no "from" and "to" to configure. There is no swap button to hunt for, because there is nothing to swap.
Your own currency is pinned at the top and cannot be removed. The number you care about most is always in the same place, however long the list grows. Everything under it is yours to arrange. 30 currencies are available, and tapping one makes it the main one.
The date on screen is the rate's date
The header reads something like ECB · 2026-09-11. That date belongs to the rates, not to the moment they were downloaded. Showing the download time would make a stale number look fresh.
Three things are worth knowing about where the numbers come from.
- The source is the European Central Bank's daily reference rates, fetched straight from the ECB.
- The schedule is once each working day, around 16:00 Central European Time.
- The gaps are weekends and holidays, when nothing is published at all.
So a date from a few days ago is normal, not a fault. If the ECB cannot be reached, the app falls back to another provider and says so on screen.
One caveat worth stating plainly. These are reference rates. Banks, card networks, and exchange counters each add a margin. What you actually pay is higher. Use these numbers to plan a trip or size up a purchase, not to predict the figure at a counter.
It still works on the plane
The last rates received are stored on the phone. Conversion continues with no signal — in the air, underground, or abroad before a SIM works. While the app is open it re-checks about once an hour, and a manual refresh is always there.
Numbers go in through a keypad built into the app. The system keyboard never rises to cover the rates, and decimals are kept exactly as typed.
What you enter stays on the device. The app downloads the day's rate table. It does not send your amounts or currency choices anywhere. There is no account and no login.
Wrap-up
A list of currencies that all move at once is a different tool from a converter with two boxes. The rate date is visible. The stored table survives a lost connection. The margin question is answered rather than hidden.
Put three or four currencies you actually use on the list. The search-tab round trip stops happening.
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