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 just plus 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.

Screenshots

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 toillions	`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
7 Color Themes	Dark, Light, Neon, Red, Obsidian, Plasma, Blood
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, Keyboard Shortcuts, About tabs
Configurable Font	Font family and size adjustable in Settings
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
Toast Notifications	Non-modal feedback for actions
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`
Open settings	`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          # 15+ 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 (4 tabs)
│       │   ├── ShortcutModal.ts      # Keyboard shortcuts
│       │   ├── ConfirmDialog.ts      # Confirmation dialogs
│       │   └── ContextMenu.ts        # Right-click menu
│       ├── stores/         # Reactive state
│       │   ├── calculator.ts         # Calculator state store
│       │   └── notes.ts             # Notes state store
│       ├── utils/          # Utilities
│       │   ├── shortcuts.ts          # Keyboard shortcut handler
│       │   ├── shortcutDefs.ts       # Shortcut definitions
│       │   ├── format.ts            # Number formatting
│       │   ├── html.ts              # HTML escaping
│       │   └── 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 (0.9.0)
├── logo.svg                # Project logo
├── docs/examples.txt       # Input examples
├── CHANGELOG.md            # Version history
├── CONTRIBUTING.md         # Contribution guidelines
├── SECURITY.md             # Security policy
└── LICENSE                 # MIT License

Documentation

Guide	Description
User Guide	Full user documentation with input syntax, themes, shortcuts, and notes
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

Building from Source

Prerequisites

Go 1.23+
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

Name		Name	Last commit message	Last commit date
Latest commit History 43 Commits
.github		.github
Screenshots		Screenshots
app		app
build		build
docs		docs
frontend		frontend
.eslintrc.json		.eslintrc.json
.gitattributes		.gitattributes
.gitignore		.gitignore
.golangci.yml		.golangci.yml
.version		.version
CHANGELOG.md		CHANGELOG.md
CONTRIBUTING.md		CONTRIBUTING.md
CONTRIBUTORS		CONTRIBUTORS
LICENSE		LICENSE
README.md		README.md
SECURITY.md		SECURITY.md
go.mod		go.mod
go.sum		go.sum
logo.svg		logo.svg
main.go		main.go
wails.json		wails.json

Folders and files

Latest commit

History

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LineSolv

Screenshots

Features

Core Calculator

Percentages

Unit Conversion

Currency Support

Math Functions

Constants

Variables & Context

Purchase Math

Date & Time Math

Function Graphing

Interface

Plugin System

Keyboard Shortcuts

Quick Start

Download

Install

Uninstall

Requirements

Usage

Basic Math

Natural Language

Variables

Unit Conversion

Currency

Percentages

Purchase Math

Math Functions

Graphing

Architecture

Documentation

Building from Source

Prerequisites

Steps

Development (HMR)

Tests

License

Security

Contributing

About

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Resources

License

Contributing

Security policy

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