Ratio

Ratio is a notepad calculator for Mac, Windows and Linux that lets you jot down prices, currencies, units and dates the way you would in a note, with the answer appearing beside every line as you type. It supports more than 160 live currencies and the major cryptos, with rates that refresh on their own, so you can mix dollars, euros and pounds in a single line and still get the right total. You can name a number like 'price' and use it anywhere below, or write L3 to bring in the answer from line 3, and everything updates when one value changes. Ratio converts over 150 units, handles time zones and date countdowns, and covers work and money tasks like hours times your rate, VAT, loan payments and working days that skip public holidays. Students get equation solving, integrals, derivatives, exact answers, physical constants and statistics, plus lists and small plots when needed. Key Features: - Live Currencies: 160+ currencies and crypto with auto-refreshing rates - Smart Notes: named variables and line references that update automatically - Units and Time: 150+ units, time zones and live countdowns - Work and Money: invoices, VAT, loans and working-day calculations - School and Science: equations, calculus, constants and statistics Ratio turns everyday math into simple notes that calculate themselves, with a 7-day free trial and a one-time $9.99 price.