Ratio is the notepad calculator for Mac, Windows and Linux. Jot down prices, currencies, units and dates the way you would in a note. The answer appears beside every line, the moment you type it.Write it like a note. The answer appears as you type.
Mac, Windows and Linux · Free for 7 days Also for MacWindowsLinuxSplitting the bill. Checking a quote. Planning a trip. Write a line, and Ratio writes the answer right beside it.
More than 160 currencies and the major cryptos, with rates that refresh on their own. Mix dollars, euros and pounds in a single line, and the total still comes out right.
See pricingCall a number price and use it anywhere below. Write L3 to bring in the answer from line 3. Change one value and everything that depends on it follows. Lists, fractions and small plots are there when you need them.
See pricingKilometers to miles. Fahrenheit to Celsius. Gigabytes to megabytes. Ask what 3pm is in Tokyo, or how many days are left until the deadline.
See pricingI built Ratio because I kept opening a spreadsheet just to add up five numbers. Now I write them down, and the answer is already there.
Every result here comes straight from Ratio. Times and dates are live.
Money and crypto, always current. Rates refresh quietly while Ratio runs.
Write L3 to reuse a result. Change it once, and every line below follows.
Sum a list, find the average or median, or draw sin(x) right on the page.
Type "until 18:00" or "until Christmas", then watch the time tick away.
Light, dark and beautifully in between, with glass and frosted looks on the Mac.
On the Mac, type ratio "5 km in mi" in Terminal. Same engine, same answer.
Taxes and loans. Homework and physics. The numbers developers live with every day. One notepad handles them all.
Type "1000 + VAT" or "1190 without VAT". Ratio already knows your country's rate, or uses the one you set.
"pmt(5%/12, 360, 200k)" gives you the monthly payment. "10k at 4% for 5 years" shows what your savings grow into.
"1 mar + 10 working days" skips weekends and your country's public holidays.
"solve x^2 - 5x + 6 = 0" answers x = 2 or x = 3. Integrals and derivatives, too.
Constants like c and G, complex numbers, mean and median. "isprime(91)" shows 7 × 13.
Hex and binary, "#FF8800 in rgb" and "chmod 755". Even "99.9% uptime", which leaves you 43 min 50 s a month.
A calculator forgets every step. A spreadsheet is too much for five numbers. Ratio is just right.
 Ratio |  Calculator |  Spreadsheet |  Soulver |  Numi | |
|---|---|---|---|---|---|
| Answers as you type, line by line | – | with formulas | |||
| Write it in plain words: “5 km in mi”, “3pm in Tokyo” | – | – | |||
| Every step stays on the page, ready to change | partly | ||||
| Live currency rates | partly | with formulas | |||
| Price | $9.99 once | free, built in | free or subscription | $59 once | free, license to unlock |
Soulver and Numi details from soulver.app and numi.app, October 2026. Side by side: Ratio vs Soulver · Ratio vs Numi · Ratio vs Calca · Ratio vs PCalc
One version, with everything included. Use it free for 7 days. If you love it, buy it once and keep it for good.
Everything, in every license
Ratio is a notepad calculator for Mac, Windows and Linux. You type calculations as plain text, like "dinner 84 eur / 3", and the answer appears beside each line as you type. It understands currencies, crypto, units, dates and time zones.
Yes. Ratio runs on Windows 10 and 11 (64-bit) and on 64-bit Linux (Ubuntu 22.04 or newer, Debian, Fedora and others, as an AppImage or a .deb). It uses the same engine as on the Mac, so every line gives the same answer. The trial and the license work the same way everywhere, and a 2- or 3-computer license can mix a Mac, a PC and a Linux machine. iCloud sync, Liquid Glass and the Terminal command are Mac only for now.
Ratio runs on any Mac with macOS 13 Ventura or later, with Apple silicon or Intel.
Yes. Every calculation happens on your computer. Exchange rates need a connection to refresh, and while you're offline, Ratio uses the last rates it downloaded.
On the Mac, yes. Turn on iCloud sync in Settings and your sheets are kept in iCloud Drive › Ratio, ready on every Mac where you use Ratio. On Windows and Linux, sheets stay on the computer for now.
On the Mac, yes. Run ratio "5 km in mi" and you get the same answer as in the app.
Yes. You pay once, and that's it. Updates are included.
After 7 days, Ratio asks for a license before it calculates anything new. Your sheets stay on your computer and nothing is deleted. They're all there the moment you activate.
Ratio downloads them by itself while it runs: every hour on the Mac (and whenever it wakes), every few hours on Windows and Linux. When you're offline, it uses the last rates it got.
On the Mac, the app is in English, Romanian, German, French, Spanish and Italian. On every platform, you can write your calculations in any of these six languages.
Yes. Type "1000 + VAT" or "1190 without VAT", and Ratio uses your country's rate, or the one you set in Settings. pmt, fv, pv, npv and irr work just like in a spreadsheet, or simply write "10k at 4% for 5 years". "1 mar + 10 working days" skips weekends and public holidays.
Yes. It solves equations like "solve x^2 - 5x + 6 = 0", does integrals and derivatives, and knows physical constants like c and G. It handles complex numbers, statistics and primes, and gives exact answers such as 2√2 whenever there is one.
Hex, binary and fixed-size integers like u8 and i32, colours ("#FF8800 in rgb"), file permissions ("chmod 755"), aspect ratios, Unicode characters and uptime budgets ("99.9% uptime"). On the Mac, the ratio command gives the same answers in Terminal.
In the app, open Ratio Pro and click “Deactivate this Mac” (or “Deactivate this PC” on Windows and Linux). Then enter the same key on the new computer, whether it's a Mac, a PC or a Linux machine.
Free for 7 days. No account, no card. And if it doesn't click, no hard feelings.
Mac: macOS 13 or later, Apple silicon or Intel · Windows: 10 or 11, 64-bit · Linux: 64-bit, AppImage or .deb
Buy for $9.99 · one price on Mac, Windows and Linux