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 with confidence, track the pairs you care about, and see what the numbers actually say — built for people who need FX to be precise, not flashy. WHAT'S INSIDE Currency converter A real calculator built into the converter — type expressions, not just numbers. Exact decimal math, no rounding drift. Daily European Central Bank reference rates across 30 currencies, with full breadth in the full app via ExchangeRate-API — and the reference date always shown on screen. Markets Search any major pair, add it to your watchlist, compare one currency against another, and follow 30-day charts on the pairs that matter to you. Yield curves Government bond yields from official sources, charted and comparable across countries. The rate differential that drives currency moves — visible instead of implied. Trends and AI Outlook (full app) A directional signal for every major-currency pair — plus every other supported currency against the US dollar and the euro — computed from 30-day price momentum, with 10-year yield spreads added where both currencies have them, then explained in plain language grounded only in those numbers. No hype, no invented narratives. Offline-ready Last-known rates stay available with an honest timestamp when you lose signal. HONEST BY DESIGN Rates are reference rates — daily European Central Bank rates for the core set, ExchangeRate-API for the full breadth — not a real-time trading feed, and CertusFX says so, everywhere. Every figure carries its date. Nothing claims to be fresher than it is. FULL ACCESS Every feature is free for 14 days, then yours to keep with one payment. No auto-renewal and no subscription trap — the trial never bills you, and the unlock never expires. The full app adds full currency breadth, Markets, yields, alerts and the AI Outlook; the converter stays free. CertusFX is an information tool, not financial advice. Always do your own research before acting on any rate or outlook.