Currency Converter FX Rates
Rates, yields, AI outlooks
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
Pro is a pass, not a subscription. $4.99 for a month or $39.99 for a year. One payment, nothing auto-renews.
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 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 (Pro)
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 full Pro 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.
PRO ACCESS
One month and one year passes. No auto-renewal and no subscription trap — a pass runs out, and that's it. Pro unlocks full currency breadth and the AI Outlook.
CertusFX is an information tool, not financial advice. Always do your own research before acting on any rate or outlook.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Sharper on tablets and in Spanish.
1. Converter results now show in full on tablets and iPad.
2. Amounts reformat instantly when you switch language.
3. Shorter, clearer alert labels in Spanish.
The developer, NestCalc.ai LLC, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Linked to You
The following data may be collected and linked to your identity:
- Purchases
- Contact Info
- Identifiers
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Purchases
- Location
- Identifiers
- Usage Data
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- NestCalc.ai LLC
- Size
- 52.4 MB
- Category
- Finance
- Compatibility
Requires iOS 16.4 or later.
- iPhone
Requires iOS 16.4 or later. - iPad
Requires iPadOS 16.4 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Large Tip $9.00
- Medium Tip $5.00
- Small Tip $3.00
- 1 Year Pass $39.99
- 1 Month Pass $4.99
- Copyright
- © 2026 NestCalc.ai LLC