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Spot rates come from the European Central Bank’s daily reference feed, with extended keyed coverage in the full app; yields come from official government sources; and the AI trend outlooks are computed on our servers from that same data. The full detail is on our Methodology page.

The converter is — the 30 major currencies, no account needed. Every other feature is free for 14 days, then yours to keep with one payment: 160 currencies, the yields dashboard, AI trends, alerts and exports.

It is one payment, made here on the web or in the mobile app, that unlocks the full app for good — it never expires and nothing is charged again. An unlock bought in the app restores on any device signed in to the same Apple or Google account, and one on your CertusFX account unlocks every device where you sign in. Passes bought before October 10, 2026 became lifetime unlocks.

An unlock bought here on the web is refunded in full if you ask within 14 days: email support@nestcalc.ai with the email address you used at checkout. Link (Stripe), which sells it on the web as merchant of record, can also refund a purchase through Link support. A refunded unlock is removed from your account. Purchases made in the iOS or Android app follow Apple’s or Google’s refund policy — request those through the store.

Email support@nestcalc.ai from your account email and we will delete your account and personal data within 30 days. The full steps are on our Delete data page.

Only what is needed — an email and encrypted password if you create an optional account, the dates of your trial, lifetime unlock or early-user access, and a record of each purchase. Payments are handled by your app store or, on the web, by Link (Stripe); we never receive your full card number. An unlock bought on the web without an account lives in your browser; its purchase record holds one-way hashes of its code and of the email you gave at checkout, never the code or the email itself. Without an account, a trial or early-user record from the app is kept against the app’s anonymous purchase identifier. Preferences and watchlists stay on your device. The iOS and Android apps send crash reports and basic usage statistics to Google Firebase, never with your name, email or account ID. We do not sell your data. See our Privacy Policy.