Pricing
The essentials are free. Pro unlocks the full FX intelligence layer.
Free
$0
Check a rate, convert an amount, follow the majors. Free forever, no sign-up.
Converter + rate boards for the 31 major currencies
Daily ECB reference rates on the free data rail
Your base currency, language and watchlist
Watchlist for up to 3 pairs
30-day charts on every pair
CertusFX Pro
$4.99 / 30 days · $39.99 / 365 days
Every currency, keyed data rails, and the full analytical toolkit.
Keyed data rails (ExchangeRate-API + FRED yields)
160+ currencies, every pair
Bond-yield dashboard with FX context
AI trend outlook for every pair
The 365-day pass works out about 33% cheaper than covering a year with 30-day passes.
How the plans work
The free plan is the whole core app: a fast converter, boards for the major currencies from your own base, 30-day charts, and your personal watchlist. It runs on daily ECB reference rates from the free data rail — no account, no card, no trial clock.
Pro switches the app onto keyed data rails — ExchangeRate-API for 160+ currencies and every pair, with FRED and US Treasury data behind the bond-yield dashboard — and unlocks the analytical layer: AI trend outlooks, two-pair overlays, rate alerts, unlimited watchlists and CSV export.
Pro is sold as a timed, one-time pass in the iOS and Android apps — $4.99 for 30 days or $39.99 for 365 days. A pass simply ends when its term is up, and buying another while one is active extends your remaining time. There is nothing to buy on the web today, and the free plan stays free.
Purchases are made in the iOS and Android apps through your store account.
Open the appRates are reference values for information only, not dealing quotes.
CertusFX — a NestCalc app