LineSolv

A cross-platform desktop natural-language calculator

LineSolv is a natural-language calculator that understands phrases like $20 in euro - 5% discount or what is the 5 plus pi times five. It combines a powerful Go-based arithmetic engine with a clean, distraction-free desktop UI.

Built with Wails v2 (Go + WebView), Vite, TypeScript, and CSS custom properties for theming.

Screenshot

More screenshots: View all screenshots

Key Features

• Natural Language Math — Type phrases like what is 20 plus 5% or $20 in euro - 10% discount and get instant results
• Full-Window Transparency — Adjustable opacity (30%–100%, default 95%) with true window translucency on all platforms
• Real-Time Settings — Every setting (theme, font, opacity, line numbers, autocomplete) applies instantly with no Save button
• Line Number Toggle — Show or hide line numbers in the calculator editor
• Autocomplete Popup — Type-aware keyword suggestions that can be toggled on/off
• 27 Color Themes — Dark, Light, Neon, Red, Obsidian, Plasma, Blood, Midnight, Aurora, Mono, Frost, Prism, Lavender, Sage, Warm Light, Blue Trust Dark/Light, Orange Energy Dark/Light, Green Growth Dark/Light, Yellow Optimism Dark/Light, Purple Innovation Dark/Light, Red Passion Dark/Light with instant switching
• 5 UI Styles — Default, Liquid Glass, Material 3, Alivated, Neon — all rewritten to match their real-world design systems with authentic colors, typography, shadows, and component styling
• 17 Font Options — Sans-Serif, Serif, and Monospace fonts including JetBrains Mono, Fira Code, and more
• 40+ Unit Conversions — Length, mass, volume, temperature, time, and 30+ live currencies
• Function Graphing — Auto-detect plot expressions and render live charts
• Plugin System — 12 built-in plugins with expression-based custom functions, themes, and variables
• Notes & History — Multi-note notebooks with searchable history, PDF export, and undo/redo
• Cross-Platform — Native builds for Linux, macOS (Intel & Apple Silicon), and Windows

Features

Core Calculator

Feature	Description	Example
Natural Language	Type conversational math phrases	what is twenty five plus three
Basic Arithmetic	Full PEMDAS with +, -, *, /, %, ^	2 + 3 * 4
Number Words	spelled-out numbers up to billions	twenty five times pi
Fraction Input	Mixed numbers and fraction words	2 1/2 + 1.5, three quarters
Scale Words	double, triple, half, quarter	double 5, half of 20
Power Words	squared, cubed, square root of	5 squared, cube root of 27
Comparison	which is bigger, more than, less than	5 more than 10
Division Phrases	over, out of, divided by, into	10 over 2, 3 into 15
Multiplication Phrases	times, product of, lots of	product of 4 and 3
Collective Nouns	a dozen, a score, a couple	half a dozen
Possessive Plurals	3 tens, 5 thousands	3 tens from 5 hundreds
SI Notation	k, M, B suffixes	2B / 5k
Ordinal Suffixes	1st, 2nd, 3rd, 4th	1st + 2
Conversational Prefixes	hello, hey, ok, well, etc.	hey there calculate 6 times 7
Time Durations	2h30m, 2h + 1h15m	2h30m in minutes
"How many times"	Division as count	how many times does 5 go into 20
"Split / Shared"	Division by sharing	10 split among 2
Combined Phrases	Mix multiple patterns	5 choose 2 + 3!

Percentages

Feature	Example
Percentage of	10% of 200
Add percentage	100 + 15%
Subtract percentage	200 - 10%
"of what"	50% of what is 25
"what percent"	10 is what percent of 50
Tax and discount	100 with 8% tax, 200 after 10% discount
Tip calculation	40 plus 15% tip
Natural language	how much is one hundred plus fifty percent

Unit Conversion

Category	Units	Example
Length	mm, cm, m, km, in, ft, yd, mi	10 inches in cm
Mass	g, kg, lb, oz	1 kg in lb
Volume	ml, l, gal, qt, cup	1 gal in l
Temperature	°C, °F	100 c to f
Time	s, min, h, day	2h30m in minutes
Currency	30+ currencies (live rates)	$20 in euro - 5% discount

Currency Support

USD, EUR, GBP, JPY, CNY, INR, CAD, AUD, CHF, KRW, RUB, ILS, VND, PHP, UAH, KZT, PYG, GHS, TRY, AZN, GEL, BTC, THB, HKD, SGD, MXN, ZAR, NZD, SEK, NOK, PLN, BRL, BDT, PKR, LKR, NPR, MYR, IDR, TWD, SAR, AED, KWD, EGP, NGN, COP, CLP, ARS, PEN, MAD, XAU (gold), XAG (silver).

Math Functions

Category	Functions
Trigonometry	sin, cos, tan, asin, acos, atan, atan2
Hyperbolic	sinh, cosh, tanh
Logarithmic	log, log2, log10, ln, exp
Roots & Power	sqrt, cbrt, pow
Rounding	round, ceil, floor, trunc, sign
Absolute	abs
Statistics	avg, median, mode, stdev, variance, range
Aggregation	sum, min, max
Combinatorics	fact/factorial, gcd, lcm, ncr/choose
Random	rand, random
Geometry	hypot/pythag/hypotenuse
Utility	fract, deg, rad
Number Theory	isprime/is_prime

Constants

pi (π), e, speed_of_light, gravity, planck, boltzmann, gas_constant, avogadro, stefan_boltzmann, electron_mass, proton_mass, neutron_mass, electron_charge, bohr_radius, rydberg.

Variables & Context

Feature	Example
Assign variables	x = 42
Reference variables	x * pi
Chain assignments	y = x + 8
Context references	of that * 2, then + 10, result / 2
Previous result	last, previous, prior, last answer

Purchase Math

Feature	Example
Item pricing	5 items at $20 each
With discount	5 items at $20 each with a 15% discount
With tax	5 items at $20 each with a 15% discount and 8% sales tax
Natural language	I bought 8 items at $5 each with a 10% discount and 6% sales tax
Freelance earnings	I got 25 hours of freelance work at $37 per hour
Sale price	That $200 jacket is 25% off. What's the sale price?

Date & Time Math

Feature	Example
Relative dates	today + 14 days, today - 7 days
Named dates	last month, next week, 2 weeks from now
Specific dates	March 1 + 30 days
Age calculation	born in 2007, i am 25 years old
Trailing noise	I completing a book at today + 14 days some story

Function Graphing

Auto-detect plot/graph expressions and render live charts:

Feature	Example
Basic plot	plot x^2
Range specifiers	plot x^2 from -5 to 5
Trigonometric	graph sin(x) from 0 to 6.2832
Linear equations	y = 2*x + 3
Polynomials	plot x^3 from -2 to 2

Interface

Feature	Description
27 Color Themes	Dark, Light, Neon, Red, Obsidian, Plasma, Blood, Midnight, Aurora, Mono, Frost, Prism, Lavender, Sage, Warm Light, Blue Trust D/L, Orange Energy D/L, Green Growth D/L, Yellow Optimism D/L, Purple Innovation D/L, Red Passion D/L
Multiple Notes	Create, rename, delete, export, import calculation notebooks
Notes Sidebar	Drag-and-drop reorder, search, PDF export
History Panel	Searchable calculation history with timestamps
Variable Explorer	View and manage all assigned variables
Steps Panel	Step-by-step evaluation with intermediate results
Documentation Viewer	Built-in docs with offline caching
Plugin Marketplace	Browse, install, enable/disable plugins
Settings	General, Theme, UI Style (5 styles with authentic design system styling), Keyboard Shortcuts, About tabs — all real-time, no Save button
Configurable Font	17 font options (Sans-Serif, Serif, Monospace) with live preview
Window Opacity	Adjustable opacity slider (30%–100%, default 95%) for full-window transparency
Line Numbers Toggle	Show or hide line number gutter in the calculator editor
Result Panel Toggle	Show or hide the results column on the right side
Line Wrap Toggle	Toggle word wrapping in the editor (horizontal scroll when off)
Customizable Shortcuts	Rebind any keyboard shortcut
PDF Export	Export notes as formatted A4 PDFs
Print	Print with A4 formatting, watermark, and date
Undo/Redo	200-entry custom stack
Splash Loading Screen	Animated logo and loading bar during startup
Toast Notifications	Non-modal feedback for actions (toggleable)
Dirty-State Indicator	Accent dot shows unsaved changes
Delete Confirmation	Optional "Don't ask again" preference
Window Dragging	Drag title bar to move window
Double-Click Fullscreen	Double-click title bar to toggle maximize
Text Selection	Select and copy text in docs and plugin details
Frameless Window	Clean, modern window chrome

Plugin System

Feature	Description
Custom Functions	Expression-based or builtin-backed functions
Custom Themes	14 CSS color variables per theme
Custom Variables	Named constants available in all calculations
12 Built-in Plugins	Finance, Statistics, Geometry, Physics, Date/Time, Health, Arrays, Hex, Color, Base-N, Matrix, Random
Plugin Marketplace	Browse and install from GitHub repository
Enable/Disable	Toggle plugins on/off without restarting
No Code Execution	Safe expression-only evaluation

See the LineSolv Plugins repository for available community plugins.

Keyboard Shortcuts

Action	Shortcut
Force evaluate	Shift + Enter
Toggle notes sidebar	Ctrl/Cmd + B
Toggle variables panel	Ctrl/Cmd + I
Toggle history panel	Ctrl/Cmd + H
Toggle steps panel	Ctrl/Cmd + S
Toggle documentation	Ctrl/Cmd + J
Open settings	Ctrl/Cmd + , or `Ctrl/Cmd + ``
Create new note	Ctrl/Cmd + N
Search notes	Ctrl/Cmd + F
Print current note	Ctrl/Cmd + P
Show shortcuts reference	? or Cmd + /
History navigation	Ctrl/Cmd + ↑ / Ctrl/Cmd + ↓
Undo / Redo	Ctrl/Cmd + Z / Ctrl/Cmd + Shift + Z
Duplicate line	Ctrl/Cmd + D
Select current line	Ctrl/Cmd + L
Delete current line	Ctrl/Cmd + Shift + K
Toggle case	Alt + Shift
Move line up/down	Alt + ↑ / Alt + ↓
Close panel / clear	Escape
Clear all	Ctrl/Cmd + K
Fullscreen toggle	Double-click title bar

Quick Start

Download

Grab the latest release for your platform from the releases page.

Platform	Package
Linux	.deb (Debian/Ubuntu) or standalone binary
macOS	.dmg (Intel & Apple Silicon)
Windows	.exe (NSIS installer)

Install

Linux (Debian/Ubuntu)

sudo dpkg -i linesolv-*.deb
linesolv

Or run the standalone binary:

chmod +x LineSolv
./LineSolv

macOS

Mount the .dmg and drag LineSolv into Applications. You may need to right-click -> Open to bypass Gatekeeper on first launch.

Windows

Run the NSIS installer. LineSolv will be available from the Start menu.

Uninstall

Linux (deb)

sudo dpkg -r linesolv

To also remove user data:

rm -rf ~/.config/neostore/linesolv

macOS

rm -rf /Applications/LineSolv.app
rm -rf ~/.config/neostore/linesolv

Windows

Uninstall via Settings > Apps, then delete %APPDATA%/neostore/linesolv to remove user data.

Requirements

• Linux: WebKit2GTK 4.1+ (Ubuntu 24.10+, Fedora 40+, Arch)
• macOS: macOS 12+
• Windows: Windows 10+

Usage

Type calculations naturally. Results appear as you type — no equals button needed.

Basic Math

Input	Output
42	42
2 + 3 * 4	14
(2 + 3) * 4	20
2^10	1024
5!	120

Natural Language

Input	Output
twenty five plus 3	28
what is the square root of 144	12
calculate 15% of 200	30
how much is one hundred plus fifty percent	150

Variables

Input	Output
x = 10	x = 10
x * pi	31.4159
y = x + 8	y = 18
of that * 2	36

Unit Conversion

Input	Output
10 inches in cm	25.4 cm
1 kg in lb	2.205 lb
100 c to f	212.0 °F
2h30m in minutes	150 minutes

Currency

Input	Output
$100 + €20	$122.80
$20 in euro - 5% discount	€18.26
£20 in usd	$26.60

Percentages

Input	Output
10% of 200	20
100 + 15%	115
200 after 10% discount	180
10 is what percent of 50	20%

Purchase Math

Input	Output
5 items at $20 each	$100.00
5 items at $20 each with a 15% discount	$85.00
I bought 8 items at $5 each with a 10% discount and 6% sales tax	$40.76

Math Functions

Input	Output
sin(pi/4) + cos(pi/4)	1.4142
log2(8)	3
gcd(12, 8)	4
5 choose 3	10
avg(1, 2, 3, 4, 5)	3
stdev(10, 20, 30, 40, 50)	14.142

Graphing

Input	Output
plot x^2	Parabola chart
graph sin(x) from 0 to 6.2832	Sine wave chart
y = 2*x + 3	Linear chart

Architecture

LineSolv/
├── app/
│   ├── calculator/         # Arithmetic engine
│   │   ├── engine.go       # Core eval pipeline
│   │   ├── units.go        # Unit conversion database (100+ units)
│   │   ├── functions.go    # 40+ built-in math functions
│   │   ├── variables.go    # Variable storage
│   │   ├── steps.go        # Step-by-step evaluation
│   │   └── graph.go        # Function graphing (Chart.js)
│   ├── plugin/             # Plugin system
│   │   ├── types.go        # Manifest, Plugin, FunctionDef types
│   │   ├── loader.go       # Plugin scanning and loading
│   │   ├── builtins.go     # 20+ builtin plugin functions
│   │   ├── expr.go         # Expression evaluator for plugins
│   │   ├── state.go        # Plugin state persistence
│   │   └── state_test.go   # Plugin state tests
│   ├── service/            # Wails-bound Go methods
│   │   └── app.go          # 42+ service methods
│   └── storage/            # Persistence layer
│       ├── db.go           # SQLite database
│       ├── config.go       # TOML configuration
│       ├── exporter.go     # PDF/PNG export
│       └── fancyname.go    # Readable note names
├── frontend/
│   └── src/
│       ├── components/     # UI components
│       │   ├── TitleBar.ts           # Frameless window header
│       │   ├── CalculatorInput.ts    # Main input textarea
│       │   ├── ResultDisplay.ts      # Results column
│       │   ├── NotesPanel.ts         # Note management sidebar
│       │   ├── HistoryPanel.ts       # Searchable history
│       │   ├── VariableExplorer.ts   # Variable viewer
│       │   ├── StepsPanel.ts         # Step-by-step view
│       │   ├── GraphPanel.ts         # Chart.js graphing
│       │   ├── DocsViewer.ts         # Built-in documentation
│       │   ├── PluginPanel.ts        # Plugin marketplace
│       │   ├── SettingsModal.ts      # Settings (5 tabs)
│       │   ├── ShortcutModal.ts      # Keyboard shortcuts
│       │   ├── ConfirmDialog.ts      # Confirmation dialogs
│       │   ├── AutocompletePopup.ts  # Autocomplete dropdown
│       │   └── ContextMenu.ts        # Right-click menu
│       ├── stores/         # Reactive state
│       │   ├── calculator.ts         # Calculator state store
│       │   ├── notes.ts             # Notes state store
│       │   └── settings.ts          # Settings state store
│       ├── utils/          # Utilities
│       │   ├── shortcuts.ts          # Keyboard shortcut handler
│       │   ├── shortcutDefs.ts       # Shortcut definitions
│       │   ├── format.ts            # Number formatting
│       │   ├── html.ts              # HTML escaping
│       │   ├── fonts.ts             # Font loading
│       │   └── toast.ts             # Toast notifications
│       ├── App.ts          # Main orchestrator
│       └── style.css       # CSS custom properties + theming
├── docs/                   # Documentation
├── main.go                 # Entrypoint
├── wails.json              # Wails configuration
├── go.mod                  # Go module definition
├── .version                # Current version (0.17.0)
├── logo.svg                # Project logo
├── docs/examples.txt       # Input examples
├── CHANGELOG.md            # Version history
├── CONTRIBUTING.md         # Contribution guidelines
├── CODE_OF_CONDUCT.md      # Community standards
├── ACCESSIBILITY.md        # Accessibility statement and WCAG compliance
├── SECURITY.md             # Security policy
├── Dockerfile              # Containerized build environment
└── LICENSE                 # MIT License

Documentation

Guide	Description
User Guide	Beginner-friendly guide to using LineSolv
Expression Reference	Complete expression syntax reference
Interface Details	Documentation viewer, plugin marketplace, settings, design tokens
Screenshots	All screenshots of the LineSolv interface
Getting Started	Quick start for new users
Configuration	Settings, config file options, and data storage
FAQ & Troubleshooting	Frequently asked questions and common issues
Architecture	High-level architecture and component overview
Frontend	Frontend component structure and styling guide
Plugin Development	How to create and install plugins
Themes	Theme customization guide
Development	Development setup, build, and code standards
API Reference	Wails-bound Go method reference
Calculator Engine	How the natural-language calculation engine works
From Words to Numbers	End-to-end pipeline walkthrough
Accessibility	WCAG 2.1 AA compliance and assistive technology support
Future Features	Planned features: AI integration, self-updater, image/voice, mobile

Building from Source

Prerequisites

• Go 1.24+
• Wails CLI v2.12.0+
• Node.js 20+
• Linux: libwebkit2gtk-4.1-dev, libgtk-3-dev

Steps

git clone https://github.com/rkriad585/LineSolv.git
cd LineSolv
npm install --prefix frontend
wails build -tags "webkit2_41"
./build/bin/LineSolv

Development (HMR)

wails dev -tags "webkit2_41"

Tests

# Backend tests
go test ./app/... -v

# Frontend tests
cd frontend && npx vitest run

# Type checking
cd frontend && npx tsc --noEmit

Docker

docker build -t linesolv .
docker run linesolv

License

MIT — LineSolv (c) 2026 rkriad585.

Security

See SECURITY.md for reporting vulnerabilities.

Contributing

Contributions are welcome. See CONTRIBUTING.md for guidelines, CODE_OF_CONDUCT.md for community standards, and ACCESSIBILITY.md for accessibility information.