QCalc

A multi-purpose calculator for productivity and accessibility — standard · unit · currency · radix · formula
Keyboard first, screen-reader friendly, 10 languages. Desktop (Linux · Windows) and Android.

한국어

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Why QCalc?

QCalc packs 5 specialized calculators (Standard, Unit, Currency, Radix, Formula) and 10 languages (한국어, English, 日本語, 中文, हिन्दी, Deutsch, Español, Français, Português, Русский) into one clean, keyboard-friendly app. Whether you're crunching everyday numbers, converting units, checking exchange rates, working with hex/binary, or evaluating math formulas — it's all one tab away.

• Built with — Vue 3 + Quasar + TypeScript + Tauri 2 (desktop) + Capacitor (Android) — the legacy Electron target remains during the transition
• Runs on — Windows (NSIS installer), Linux (deb / rpm / AppImage / Snap / Flatpak), Android

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Features

5 Calculator Modes

Mode	What it does	Access
Standard	Arithmetic, percentages, trig, powers, roots, factorial	Ctrl+1
Unit Converter	15+ categories — length, weight, area, volume, angle, and more	Ctrl+2
Currency Converter	340 currencies (fiat, crypto, metals) — no API key needed	Ctrl+3
Radix Converter	Binary / Octal / Decimal / Hex with AND, OR, XOR, NOT, shifts	Ctrl+4
Formula	Type math expressions directly using mathjs syntax	Ctrl+5

Formula Calculator Highlights

• Write expressions like sqrt(2) * pi, sin(45 deg), log(1000)
• Use @ to reference the current value, $ to reference memory
• Inline editor (Space or Enter when empty) for free-form expression editing
• History navigation — ↑/↓ arrow keys to browse and reuse previous expressions
• Load from history — right-click a formula record to load it back into the formula field
• Built-in help with available functions, constants, and a link to mathjs docs
• Full expression shown in result field and saved to history

Productivity Tools

• Calculation History — search, add notes, export/import as CSV
• Memory Operations — MC, MR, MS, M+, M−, M×, M÷
• Settings Sync — export/import all settings as JSON
• Per-Calculator Number Format — independent grouping, decimal places per mode
• 64-digit Precision — powered by mathjs BigNumber

User Experience

• Themes — multiple color themes beyond dark/light
• Adaptive Layout — history panel auto-appears on wider screens
• Accessibility — ARIA labels, screen reader announcement of results (AT-SPI announcements on Linux, aria-live elsewhere), WCAG AA contrast, keyboard focus indicators, reduced motion support
• Keyboard-first — every function has a shortcut
• Mobile — swipe to switch modes, haptic feedback
• Always on Top — pin the calculator above other windows (not available on native Linux Wayland sessions; opt in with QCALC_FORCE_XWAYLAND=1)
• 10 Languages — 한국어, English, 日本語, 中文, हिन्दी, Deutsch, Español, Français, Português, Русский
• Auto Update — Windows installer and Linux AppImage update automatically (deb/rpm are manual; Snap/Flatpak update via their stores)

All translations except Korean were generated by AI. If you notice any errors or have suggestions for improvements, please let us know through Issues.

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Keyboard Shortcuts

Legend: C = Ctrl, S = Shift, A = Alt

Common

Key	Action
0-9 .	Number input
+ - * /	Arithmetic
Enter =	Calculate
Backspace	Delete last
Delete	Clear all
u i	x² / √x
j	Toggle sign ±
k %	Percentage
l	Reciprocal 1/x
'	Shift mode

Shift Mode (Standard)

Key	Action
r t	xⁿ / ⁿ√x
f	10ⁿ
g	Modulo
h	Factorial x!
q w e	sin / cos / tan
z x c	π / φ / e
a s d	π/2 / ln10 / ln2
v b	Integer / fractional part

Memory

Key	Action
C-Enter	Store (MS)
C-Backspace	Recall (MR)
C-Delete	Clear (MC)
C-+ C--	M+ / M−
C-* C-/	M× / M÷

Unit / Currency (Shift Mode)

Key	Action
a s d	×10 / ×100 / ×1000
z x c	÷10 / ÷100 / ÷1000
f g h	×2/×3/×5 or +5/+10/+100
q w e	÷2/÷3/÷5 or −5/−10/−100
\	Swap source ↔ target
A-\	Toggle symbol display

Programmer (Radix)

Key	Action
z x c a s d	Hex A–F
j k l	AND / OR / XOR
h	NOT
r t	Shift ±1 bit
f g	Shift ±4 bits
u i	Shift ±N bits
q w e	NAND / NOR / XNOR
\	Swap source ↔ target
A-\	Toggle radix display
A-C-\	Toggle prefix/suffix

Formula (Edit Mode)

Key	Action
Space	Enter edit mode
Enter	Evaluate (or enter edit if empty)
Escape	Clear expression and exit edit
↑ ↓	Browse expression history
=	Evaluate expression

Navigation & UI

Key	Action
F1–F5	Help / About / Settings / History / Tips
C-Tab →	Next tab
C-S-Tab ←	Previous tab
C-1–C-5	Jump to tab
Escape	Close panel
A-t	Always on top
A-d	Dark mode
A-n	Per-calculator number format
A-p	Haptic feedback
,	Toggle grouping
A-,	Grouping unit (3/4)
[ ]	Decimal places (∞–16)
;	Toggle extra functions

Clipboard

Key	Action
C-c	Copy main panel
S-C-c	Copy sub panel
C-v	Paste to main
S-C-v	Paste to sub

History Panel

Key	Action
↑ ↓	Scroll
PgUp PgDn	Fast scroll
Home End	Top / bottom
C-f	Search
C-[ C-]	Font size −/+

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Installation

Platform	Method
Windows	Download NSIS installer from Releases (auto-update supported)
Linux	.deb / .rpm / AppImage from Releases (AppImage auto-updates), Snap (snap install qcalc), or Flatpak from our own repository: flatpak install --user https://from104.github.io/qcalc/flatpak/qcalc.flatpakref (auto-updates)
Android	APK from Releases

Linux package compatibility: the .deb supports Ubuntu 22.04+ / Debian 12+ (and derivatives such as Mint 21+, Pop!_OS 22.04+); the .rpm supports Fedora 37+ and openSUSE Leap 15.6+/Tumbleweed. RHEL/Alma/Rocky 9 and older Debian/Ubuntu are not supported by these packages (glibc/WebKitGTK too old) — use the AppImage (any distro with glibc 2.35+), Flatpak, or Snap instead; those bundle their own runtime.

Screen reader users on Linux: use the .deb, .rpm or AppImage. Inside the Flatpak sandbox the WebKit UI is currently not exposed to assistive technologies (upstream limitation, #113).

macOS / iOS builds are not available at this time.

Upgrading from 0.12.x or older (Electron)? On Windows and the AppImage the old app's update check reaches 0.13.1 and installs it for you; on Windows the old installation is removed in the process. Every other package (.deb, .rpm, Snap, Flatpak) has to be installed by hand. Either way, bring your data over: in the old app export your history (CSV) and settings (JSON), and import them from the new app's first-run screen (or Settings).

0.13.0 itself was published without the file the old app's updater reads, so an install still on 0.12.x will only be offered 0.13.1 or later.

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Contributing

See CONTRIBUTING.md for translation and contribution guidelines.

Development

See DEVELOP.md for build instructions and development setup.