How to check currencies

Every currency app can tell you what a euro is worth right now. Almost none can tell you what it was worth on 14 March — the only number that matters when you are filing an expense, reconciling a card statement, or answering a question from your accountant.

How to convert currencies treats history as a lookup, not a decoration.

RATE ON ANY DATE
Pick a date, pick a pair, get the exact rate. European Central Bank reference rates, daily, back to 1999. Every result names its source and the day it was published, and gives you a line that pastes straight into an expense claim:

€142.50 @ 1.1450 ECB 13 Mar 2026 = $163.16

WEEKENDS HANDLED PROPERLY
No rate is published on a Saturday. The app uses the previous business day's rate and tells you it did — which is what tax authorities do, and exactly the query it saves you.

CONVERT AS YOU TYPE
Your currencies on one screen, in your order, never reshuffled. Tap any row to type in it. The amount field does maths, including across currencies:

2000 USD + 500 EUR
80 + 15%
(20 + 5) x 3

WHAT YOUR CARD ACTUALLY CHARGES
Add your card's percentage, a bureau's spread, or an ATM's percentage and flat fee. Every row then shows what it really costs alongside the mid-market rate. Because a flat 5 euro fee is 5% of a 100 euro withdrawal and 1.25% of a 400 euro one, the app works out the true percentage for the amount you are actually converting.

WORKS OFFLINE
Rates are cached as they are fetched, with a plain "rates as of" line. A cached number never pretends to be a live one — and a weekend is never mistaken for a stale one.

180+ CURRENCIES
Every circulating currency, plus withdrawn ones for old invoices: marks, francs, lira and the rest, at their irrevocable euro rates. Precious metals and major cryptocurrencies are there too, always labelled indicative, because an exchange aggregate is not a published fixing.

NO ADS. NO ACCOUNT. NO TRACKING.
No advertising, at any tier. No sign-in, no email address, no analytics. The only permission the app asks for is network access, and the only thing that leaves your phone is a request for a rate — carrying no identifier and nothing about you.

WHAT IT ISN'T
Not a money transfer app, not a budgeting app, not a trading app. It converts currencies and looks up historical rates. That is the whole product, and it is deliberate.