Productivity · $59 · one-time (60-day trial)
A notepad that does math as you type — write calculations in plain language, reference earlier lines by name, and watch every answer update when a number changes.
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A notepad calculator: type calculations like a note, and the answer appears beside each line as you type.
Ratio replaces the back-and-forth between Notes and Calculator. Write "dinner 84 eur / 3 in usd", "until friday 18:00" or "1200 + VAT", and the answer is already there. Name a value and reuse it further down. Every step stays on screen, so you can see how you got the total and change any number later.
It handles 160+ live currencies and crypto, units, dates and time zones, VAT by country, loans and working days, plus equations and integrals for school. Works offline, syncs sheets through iCloud, and includes a ratio command for Terminal.
Built natively in Swift with AppKit and SwiftUI: real menu bar and keyboard shortcuts, a global hotkey (⌥Space), light and dark mode with 14 themes, Liquid Glass and frosted materials on macOS 26, notarized by Apple.
$9.99 one-time, 7-day free trial, no account, no subscription. macOS 13 or later, Apple silicon and Intel.
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