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.

The download is free, and so is the converter: the 30 major currencies at daily reference rates, one-tap invert and the converter's chart over 7 days and 1 month. Every other feature — 160 currencies, the Markets tab, yields, AI outlooks, watchlists, rate alerts and CSV export — is free for 14 days, then yours to keep with one payment.

Start it with one tap in the app or on the Pricing page, and every feature unlocks for 14 days. Starting it is free, and nothing is charged when it ends: the converter stays free and everything else locks until you unlock it. On iPhone and iPad the trial starts through the App Store as a free in-app item. Each account gets one trial.

The download and the converter are free. Everything else is one lifetime unlock: a single payment that never expires — nothing is charged again. On the web, Link (Stripe) sells it as merchant of record, with any applicable tax included, and may show and charge the price in your local currency; in the mobile apps, your app store shows its own local price. The current price is on the Pricing page.

No. If you had CertusFX installed before this update, you keep every feature free, for good. Sign in and it follows your account to your other devices — and every account created before October 10, 2026 has it already. A pass bought before that date also became a lifetime unlock.

Spot rates come from public reference sources: the European Central Bank daily feed for the free converter, plus extended keyed coverage from ExchangeRate-API in the full app. 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 — rate alerts are part of the full app: included in the 14-day free trial and with the lifetime unlock, on any 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 without signing in, and your preferences — base currency, language, watchlist — stay on your device. A free account is optional: it carries your trial, your lifetime unlock or your early-user access to every device you sign in on.

It lives in the browser you bought it in until you save it to an account — the page offers this right after checkout. If that browser’s data is cleared before you save it, we can’t re-issue it, but our support team can refund it.

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