CertusFX Currency Converter FX

Pay once. Own it forever. Try every feature free for 14 days, then unlock CertusFX with a single payment — no subscription, no renewals.

CertusFX turns currency data into decisions.

Convert between 30 major currencies using the European Central Bank's official daily reference rates — free, no account, no sign-up. Every screen names its source and tells you how old the data is, so you always know what you're looking at.

These are official once-a-day reference values, not live dealing quotes. If you need tick-by-tick dealing prices, this isn't that app — and it says so rather than implying otherwise.

Free, always: the converter for the 30 major currencies at daily ECB reference rates, one-tap invert, and its chart over 7 days and 1 month.

Unlock the full app — $4.99, one time:
160 currencies instead of 30. Government bond yield curves for the US across 11 tenors, plus 10-year series for other major economies. An AI trend outlook for every major pair, refreshed daily. An unlimited watchlist and unlimited alerts. Compare two pairs on one chart, and export a pair's history to CSV.

One payment, nothing auto-renews, nothing to cancel. No trial that quietly bills you, no card on file waiting for a renewal date.

Rate alerts run on your device. No push server, no account required, no tracking of what you watch.

CertusFX is available on iPhone, Android, and the web.