Ratio

The notepad calculator for Mac, Windows and Linux: write it like a note, see the answer as you type.

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adrianhqs[maker]· 13d ago
I built Ratio after getting fed up opening spreadsheets just to add a few numbers – now I can jot a line and see the result instantly, with live currencies, units and date math. It works as a notepad calculator on Linux, showing answers beside each line as you type. Could you try the live currency conversion feature and let me know what, if anything, breaks? 😊

The notepad calculator for Mac, Windows and Linux: write it like a note, see the answer as you type. 160+ live currencies, units, dates. $9.99 once, free trial. Ratio is the notepad calculator for 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. Splitting 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.

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Ratio is a notepad-style calculator for Mac, Windows and Linux that shows answers beside each line as you type.

for: Everyday users, students, developers and professionals who need quick calculations with units, currencies and dates.
pricing: paid · free trial

Key features

6 features of Ratio

Live currencies & crypto — More than 160 currencies and major cryptos with rates that refresh automatically.
Units & time zones — Convert any unit or time zone directly in the note, e.g., km → mi or 3 pm → Tokyo.
Smart line references — Use L3 to reuse a result; changing a value updates all dependent lines.
Lists, plots & statistics — Sum lists, compute averages, medians and draw simple plots like sin(x).
Developer helpers — Hex, binary, colour conversion, file permissions and uptime calculations built-in.
Offline & private — All calculations run locally; no account, no tracking, and data never leaves your device.

Use cases

Split a restaurant bill with tip among friends.
Convert travel expenses across multiple currencies.
Calculate VAT, loan payments or interest for invoices.
Solve homework equations, integrals or physics constants.
Generate quick unit conversions while coding.

Ratio FAQ

What is Ratio?+

Ratio is a notepad calculator for Mac, Windows and Linux that shows answers beside each line as you type, supporting currencies, units, dates and more.

Does Ratio work offline?+

Yes, all calculations run locally; live exchange rates need an internet connection, otherwise the last cached rates are used.

Is there a free trial?+

Yes, Ratio offers a 7-day free trial with no account or credit card required.

Can I sync sheets between devices?+

Sheets sync via iCloud on Macs; on Windows and Linux they stay on the local computer.

How are updates handled?+

You pay once and receive all updates for the licensed computers.

Is there a discount for students or teachers?+

Yes, a 50 % discount is available by emailing hello@useratio.app from a school address.

Summarized by DevHunt from useratio.app · Oct 22, 2026. Details may change; check the official site.