omacus
v0.1.0Free & open source · Omarchy, Linux, macOS, Windows

Math, the way you write it.

Omacus is a notepad calculator. Jot down prices, units, currencies and time zones in plain words, and the answers line up beside them as you type.

$curl -fsSL omacus.com/install | bash
On Omarchy it offers a keybind and a floating window.deb, .rpm, .tar.gz

A live replay with real answers from the Omacus engine.

// what it understands

Write it like you'd say it.

No formula syntax to learn. Omacus reads the way you already write notes, and quietly ignores the words that aren't math.

Units

Distance, time, temperature, data, cooking, area and hundreds more, converted with in or to.

3.5 km in miles2.17 miles
2 cups in ml473.18 ml

Currencies

160+ currencies with live exchange rates, cached so it keeps working offline. Symbols or codes, your call.

$30 in EUR26.75 EUR
₹5,000 in USD$52.58

Time zones

Abbreviations, cities and countries, with daylight saving handled. Tells you when it lands on another day.

3pm PST in IST3:30 AM IST (next day)
noon UTC in Tokyo9:00 PM JST

Percentages

The everyday phrasings: of, on, off, as a percent of, and what a number is a percentage of.

15% off $1,299$1,104.15
$120 as % of $48025%

Variables & totals

Name things once, reuse them below. total, average and prev work over each block.

rate = $85/hour$85 / hour
rate * 30 hours$2,550

Notes, not code

Headers, comments, labels and plain prose sit right next to the math. Lines read like a notebook.

Lunch with Sam $18$18
Rent: $1,450$1,450
// sheets

Nothing to save. Ever.

Keep a sheet per trip, budget or invoice. Like Sublime Text, every keystroke is saved, and closing the window loses nothing.

  • Reopens exactly where you left off, cursor included.
  • Plain text files on disk, so you can search, sync or back them up.
  • Deleted sheets go to the trash, not into the void.
  • Autocomplete for your variables, units and time zones.
Omacus showing an invoice sheet, with a sidebar of other sheets, in the Tokyo Night theme
// themes

Looks like the rest of your desktop.

On Omarchy, Omacus wears your theme and switches the moment you do. Elsewhere it follows your system's light or dark mode, or any colors you give it.

Omacus in the Matte Black theme Omacus in the Tokyo Night theme Omacus in the Catppuccin theme Omacus in the Gruvbox theme Omacus in the Everforest theme Omacus in the Nord theme Omacus in the Rosé Pine theme Omacus in the Catppuccin Latte theme
The built-in help, showing syntax examples with live results
// keyboard first

Hands stay on the keys.

Everything has a shortcut, and F1 opens a built-in guide where every example is calculated live.

New sheet Ctrl N
Next sheet Ctrl Tab
Jump to sheet Ctrl 1–9
Copy last result Ctrl Shift C
Accept suggestion Tab
Hide sidebar Ctrl B
// command line

Also lives in your terminal.

The same engine answers one-off questions, or evaluates a whole sheet from a pipe. Handy in scripts, launchers and status bars.

CLI docs 

$ omacus '$100 in INR'
9,510.01 INR
$ omacus '3pm PST in IST'
3:30 AM IST (next day)
$ printf 'rent = $1450\nrent * 12\n' | omacus -
$1,450
$17,400
// download

Get Omacus.

Free and MIT licensed. Pick your platform; the latest release is always one command away.

Omarchy & Arch

Installs the app, then offers a keybind (Super Ctrl Alt = by default, checked against yours) and a floating window.

$curl -fsSL omacus.com/install | bash

Colors follow your Omarchy theme automatically.

macOS Apple Silicon & Intel

The one-liner installs Omacus.app into Applications and opens without a security prompt.

$curl -fsSL omacus.com/install | bash
Download .dmg

From the .dmg, macOS asks once: open the app, then System Settings → Privacy & Security → Open Anyway.

Windows 64-bit

A single portable omacus.exe. Unzip it anywhere and run it; pin it to Start if you like.

Download .zip

If SmartScreen warns about an unknown publisher, choose More info → Run anyway.

Other Linux x86_64

The same one-liner works on any distribution, or use a package:

.deb .rpm .tar.gz

Ubuntu: sudo apt install ./omacus-linux-x86_64.deb · Fedora: sudo dnf install ./omacus-linux-x86_64.rpm

Your next calculation is a sentence.

One command, and Omacus is a keystroke away.

$curl -fsSL omacus.com/install | bash
Read the docsStar on GitHub