CertusFX
In-app purchases
Everyone
info
1+
Downloads
About this app
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 for Pro via ExchangeRate-API — and the reference date always shown on screen.
Markets
Search any 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 (Pro)
A directional signal for every major-currency pair — plus every other supported currency against the US dollar and the euro — computed from 30- and 90-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 daily central-bank reference rates, not a real-time trading feed — and CertusFX says so, everywhere. Every figure carries its date. Nothing claims to be fresher than it is.
PRO ACCESS
30-day and 365-day passes. No auto-renewal and no subscription trap — a pass runs out, and that's it. Pro unlocks full currency breadth, extended charts, and the AI Outlook.
CertusFX is an information tool, not financial advice. Always do your own research before acting on any rate or outlook.
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 for Pro via ExchangeRate-API — and the reference date always shown on screen.
Markets
Search any 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 (Pro)
A directional signal for every major-currency pair — plus every other supported currency against the US dollar and the euro — computed from 30- and 90-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 daily central-bank reference rates, not a real-time trading feed — and CertusFX says so, everywhere. Every figure carries its date. Nothing claims to be fresher than it is.
PRO ACCESS
30-day and 365-day passes. No auto-renewal and no subscription trap — a pass runs out, and that's it. Pro unlocks full currency breadth, extended charts, and the AI Outlook.
CertusFX is an information tool, not financial advice. Always do your own research before acting on any rate or outlook.
Currency converter, yield curves, and AI-backed FX outlooks.
Updated on
Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
- No data shared with third partiesLearn more about how developers declare sharing
- This app may collect these data typesPersonal info, Financial info, and Device or other IDs
- Data is encrypted in transit
- You can request that data be deleted
What’s new
Buy a Pro pass without creating an account first — sign in whenever you're ready and your pass attaches automatically.
Signing up on the web now signs you straight in, and email confirmation tells you clearly whether it worked.
Your Pro status and remaining time now show correctly everywhere in the app.
More stable throughout, with better recovery if something goes wrong.
Signing up on the web now signs you straight in, and email confirmation tells you clearly whether it worked.
Your Pro status and remaining time now show correctly everywhere in the app.
More stable throughout, with better recovery if something goes wrong.
App support
About the developer
NestCalc.ai LLC
daron@nestcalc.ai
30 N Gould St Ste R
Sheridan, WY 82801-6317
United States
+1 970-420-0500
