Frequently asked questions

CertusFX is an exchange-rate app: a fast converter, market boards, government bond yields and AI trend outlooks — one app for iOS, Android and the web.

Yes — the converter, the majors boards, charts, one rate alert and personalization (like your base currency) are free. CertusFX Pro adds 160 currencies, the yields dashboard, AI trends, unlimited watchlists and rate alerts, and CSV export.

Pro is a one-time pass: $4.99 for one month or $39.99 for one year. Purchases are made inside the mobile app through your app-store account; there is nothing to buy on the web today.

Spot rates come from public reference sources: the European Central Bank daily feed on the free rail, plus extended keyed coverage from ExchangeRate-API on the Pro rail. Yield data comes from official government sources. Cached or sample data is always badged in the app.

Every screen labels its data honestly. The age label ("updated 5h ago", "updated 2d ago") is the elapsed age of the data itself, measured from its own reference timestamp — these are reference rates, not live ticks. If a refresh fails, the label says so and the app shows the last rates stored on your device. SAMPLE marks bundled demonstration data — for example the yields dashboard before an API key is configured — and APPROX marks a nearest-equivalent fallback series. You are never shown sample data unlabeled.

CertusFX runs on iOS, Android and the web from a single codebase, with the same features everywhere. The one platform difference: rate alerts notify you on iOS and Android, while on the web they show inside the app. The web app is open to everyone, no install needed. It is on Google Play and the App Store.

Yes — Free keeps one alert running at a time on a majors pair, and Pro removes the limit and covers every pair. Alerts are checked when you open the app and about once an hour in the background on Android and iOS, and on the web they show in the app instead of notifying you.

No. The app works fully without signing in, and your preferences — base currency, language, watchlist — stay on your device. A free account is optional and available now: it links a Pro pass to you, so your Pro access works on every device you sign in on.

No. Rates and outlooks are informational only and can be delayed or approximate. Always confirm with your payment or exchange provider before moving money.