QCalc is more than just a simple calculator - it's evolving into a modern productivity tool. Built with the latest web technologies like Vue3 (Quasar v2), TypeScript, and Electron, this multi-purpose calculator is being developed into an app that's useful for real work, tasks, and learning. We're also focusing on accessibility so that users with disabilities can use it intuitively, and we're working hard to provide a helpful user experience on both desktop and mobile with a simple and clean UI.
The calculator alone appears when the window width is reduced.
- 4 Professional Calculators: Standard calculator, unit converter, currency converter, and programmer calculator meet all your calculation needs
- High-precision Calculation Engine: Supports accurate calculations up to 64 digits with advanced math functions like trigonometry, factorial, and powers
- Number Base & Bit Operations: Converts between binary/octal/decimal/hexadecimal and supports professional bit operations (AND, OR, XOR, NOT) for programmers
- Smart User Experience: Provides personalized environment with unit/currency favorites, various color themes, and calculation history notes and export/import
- Cross-platform Support: Delivers consistent experience on Windows, Linux desktop and Android mobile with automatic update support
- Accessibility-focused Design: Continuously improved for easy access by all users with keyboard shortcuts, haptic feedback, and adaptive layouts
- Settings Management: Export or import all settings to a file to maintain the same settings across different environments
- How to Access: Ctrl+1 or select the top tab
- Basic Operations: Enter numbers 0-9, +, -, *, / keys
- Advanced Functions: Trigonometric functions (q, w, e), square (u), square root (i), constants (z: π, x: φ, c: e)
- Memory Functions: Ctrl+Enter (MS), Ctrl+Backspace (MR), Ctrl+Delete (MC)
- Percentage Calculation: 'number, /, number, %(k)' calculates percentage
- Apply Percentage: 'number, *, number, %(k)' applies percentage
- How to Access: Ctrl+2 or select the top tab
- Conversion Categories: Over 15 categories including length, area, volume, weight, angle, etc.
- Favorites: Set frequently used units as favorites for quick access
- Swap Units: Use '\' key to swap original/converted units
- Quick Conversion: ×10/×100/×1000 (a/s/d), ÷10/÷100/÷1000 (z/x/c)
- Unit Symbol: Toggle unit symbol display/hide with Alt+\ key
- How to Access: Ctrl+3 or select the top tab
- Latest Exchange Rates: Reflects real-time exchange rate information
- Favorites: Set frequently used currencies as favorites for quick access
- Quick Calculation: +5/+10/+100 (f/g/h), -5/-10/-100 (q/w/e)
- Swap Currencies: Use '\' key to swap original/converted currencies
- Currency Symbol: Toggle currency symbol display/hide with Alt+\ key
- How to Access: Ctrl+4 or select the top tab
- Supported Radix: Convert between binary, octal, decimal, and hexadecimal
- Hexadecimal Input: Enter A-F using z, x, c, a, s, d keys
- Swap Radix: Use '\' key to swap original/converted radix
- Radix Symbol: Toggle unit symbol display/hide with Alt+\ key
- Symbol Position: Toggle unit symbol position (front/back) with Alt+Ctrl+\ key
- How to Access: F4 key or side menu
- Scroll: Move 50px with ↑/↓ keys, 400px with Page Up/Down
- Search/Delete: Search with Ctrl+F, delete history with Ctrl+D
- Export/Import: Export or import calculation history as a CSV file through the buttons in the header
- Font Size Control: Adjust the font size in 3 steps with the buttons in the bottom left corner.
- Add Notes: Add notes to individual records
- Left Swipe (Mobile): Add/edit notes
- Right Swipe (Mobile): Delete records
- How to Access: F3 key or side menu
- Reset: Reset all settings to their default values
- Export/Import: Save or load current settings as a JSON file to use the same settings in different environments
- Show/Hide Separator: Toggle with , key
- Set Grouping Unit: Change between 3/4 digits with Alt+, key
- Decimal Places: Adjust with [, ] keys (unlimited~16 digits)
- Shift Mode: Activate with ' key to access advanced functions
- Tab Navigation: Move between tabs with Ctrl+Tab (→), Ctrl+Shift+Tab (←)
- Screen Switch: F1 (Help), F2 (Info), F3 (Settings), F4 (History), F5 (Tips)
- Copy Main Panel: Ctrl+C, Ctrl+Insert
- Copy Sub Panel: Shift+Ctrl+C, Alt+Ctrl+Insert
- Paste to Main Panel: Ctrl+V, Shift+Insert
- Paste to Sub Panel: Shift+Ctrl+V, Alt+Shift+Insert
- Open Menu: Click the panel and use the menu to copy/paste
- N-th Power/N-th Root: Calculate with r/t keys
- Trigonometric Functions: q/w/e keys in shift mode
- Extract Integer/Decimal: Calculate with v/b keys
- Factorial: Calculate with h key
- Store & Recall Memory: Store (MS) and recall (MR) after calculation
- Memory Calculation: Accumulate values with M+, M-, M×, M÷ functions
- Clear Memory: Clear memory with MC
- Memory Status: Click the memory icon on the main panel
- Bit Operations: AND (j), OR (k), XOR (l), NOT (h), shift operations (r/t/u/i)
- Logic Extension: Use NAND/NOR/XNOR operations with q/w/e keys
- Shift Operations: Move bit positions by 1 bit/4 bits
- Set Bit Size: Bit operations according to the set size
- Theme System: Choose from various color themes beyond dark/light mode (change in F3 Settings)
- Always on Top: Toggle always-on-top with Alt+t key
- Resize Window: Side panel auto-adjusts based on window size
- Reset Panel: Toggle panel reset at startup with Alt+i key
- (De)activate Dark Mode: Switch dark mode with Alt+d key
- Swipe: Switch calculator modes by swiping left or right
- (De)activate Haptic Mode: Toggle haptic mode with Alt+p key
- Tablet Landscape Mode: Side panel auto-adjusts in tablet landscape mode
| Shortcut | Function |
|---|---|
| 0-9. | Enter numbers and decimal |
| +, -, *, / | Basic arithmetic |
| Enter, = | Calculate result |
| Backspace | Delete one character |
| Delete | Reset calculator |
| u | Square (x²) |
| i | Square root (√x) |
| j | Change sign (±) |
| k, % | Percentage (%) |
| l | Reciprocal (1/x) |
| ' | Activate shift mode |
| Shortcut | Function |
|---|---|
| r | Power (xⁿ) |
| t | Root (ⁿ√x) |
| f | Power of 10 (10ⁿ) |
| g | Modulo (x%y) |
| h | Factorial (x!) |
| q,w,e | Trig (sin, cos, tan) |
| a,s,d | Constants (Pi/2, ln10, ln2) |
| z,x,c | Constants (Pi, phi, e) |
| v | Integer part |
| b | Fractional part |
| Shortcut | Function |
|---|---|
| C-Delete | Memory clear (MC) |
| C-Backspace | Memory recall (MR) |
| C-Enter, C-= | Memory store (MS) |
| C-+, C-Numpad + | Memory add (M+) |
| C--, C-Numpad - | Memory subtract (M-) |
| C-*, C-Numpad * | Memory multiply (M×) |
| C-/, C-Numpad / | Memory divide (M÷) |
| Shortcut | Function |
|---|---|
| f,g,h | ×2/×3/×5 or +5/+10/+100 |
| q,w,e | ÷2/÷3/÷5 or -5/-10/-100 |
| a,s,d | ×10/×100/×1000 |
| z,x,c | ÷10/÷100/÷1000 |
| \ | Swap source and target |
| A-\ | Toggle unit/currency display |
| Shortcut | Function |
|---|---|
| r,t | 1-bit shift (x<<1, x>>1) |
| u,i | Left/right shift (x<<y, x>>y) |
| f,g | 4-bit shift (x<<4, x>>4) |
| h | NOT operation |
| j,k,l | Bit operations (AND, OR, XOR) |
| q,w,e | NAND, NOR, XNOR |
| z,x,c | Hex input (A, B, C) |
| a,s,d | Hex input (D, E, F) |
| \ | Swap source and target |
| A-\ | Toggle radix display |
| AC-\ | Toggle radix position (pre/post) |
| Shortcut | Function |
|---|---|
| F1 | Help |
| F2 | About |
| F3 | Settings |
| F4 | History |
| F5 | Tips |
| C-[1234] | Switch calculator tabs |
| C-Tab, → | Move to right tab |
| CS-Tab, ← | Move to left tab |
| Escape | Close current screen |
| Shortcut | Function |
|---|---|
| A-t | Toggle always on top |
| A-i | Toggle init panel on startup |
| A-d | Toggle dark mode |
| A-p | Toggle haptic mode |
| , | Toggle number grouping |
| A-, | Change grouping unit (3/4) |
| [, ] | Adjust decimal places (∞~16) |
| q | Quit application |
| Shortcut | Function |
|---|---|
| C-c, C-Insert | Copy main panel result |
| SC-c, AC-Insert | Copy sub panel result |
| C-v, S-Insert | Paste to main panel |
| SC-v, AS-Insert | Paste to sub panel |
| Shortcut | Function |
|---|---|
| ↑/↓ | Scroll 50px up/down |
| PageUp/PageDown | Scroll 400px up/down |
| Home/End | Scroll to top/bottom |
| C-f | Search history |
| C-[ | Decrease font size |
| C-] | Increase font size |
- Download and install the appropriate file for your platform from the release page.
- Windows installer and Linux AppImage files support automatic updates.
- For Linux, use the AppImage file standalone or install with
sudo snap install --beta qcalc. - For Android, install the provided APK. Coming soon to Play Store.
- MacOS and iOS packages are not available due to lack of testing capabilities.
For detailed development and build instructions, please refer to DEVELOP.md.