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Welcome to Numix

Numix is a professional-grade mobile application designed specifically for commercial math calculations. Built with Flutter, it provides a comprehensive suite of tools for business professionals, retail managers, and entrepreneurs who need precise mathematical calculations for pricing, discounts, and inventory management.

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What is Numix?

Numix is more than just a calculator app—it’s a complete math suite that handles the complex calculations required for running a business. Whether you’re calculating multi-tier discounts, determining optimal sales prices with different profit margins, or managing product inventory, Numix provides the tools you need with mathematical precision.

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Who is Numix For?

Retail Managers

Calculate discounts, pricing, and manage inventory with precision

Business Owners

Determine optimal pricing strategies and profit margins

Sales Professionals

Quick access to discount calculations and pricing tools

Financial Analysts

Accurate commercial math with transparent calculation logic

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Key Features

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Discount Calculator

Calculate complex, multi-tier discounts with precision. Supports both percentage-based and fixed-amount discounts, with automatic tax calculations.
  • Dual discount types: Percentage or fixed amount
  • Sequential discounts: Apply multiple discounts in sequence
  • Tax integration: Automatic tax calculation on final price
  • Persistent state: Your calculations are saved automatically

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Sales Price Calculator

Determine the optimal sales price based on cost and desired profit margin. Supports two calculation methods: markup (profit over cost) and margin (profit over selling price).
  • Markup calculation: Add percentage profit to cost
  • Margin calculation: Calculate price from desired profit margin
  • Tax support: Include tax in final price calculations
  • Real-time results: Instant calculation as you type

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Product Inventory Management

Track your products, quantities, and pricing information in a single, organized interface.

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Sales History

Maintain a complete history of your sales transactions for analysis and reporting.

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Why Numix?

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Mathematical Precision

Numix is built with mathematical accuracy as a core principle. The application uses the math_expressions library to ensure precise calculations and avoid floating-point arithmetic errors that can occur with standard calculations.
All numeric inputs are validated and parsed safely using double.tryParse() with comprehensive error handling to prevent crashes from invalid input.

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Domain-Driven Feature-First Architecture

Numix follows a strict Domain-Driven Design (DDD) approach with a feature-first architecture. This means:
  • Isolated features: Each feature (discount calculator, sales price calculator, etc.) is completely self-contained
  • Clear separation: UI components are “dumb” widgets that only display data and trigger events
  • Business logic isolation: All calculation logic, validation, and business rules reside in Providers and Services
  • Maintainable codebase: Easy to understand, test, and extend

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Architecture Structure

The project is organized into two main directories: 
lib/
├── core/              # Shared utilities, themes, and constants
└── features/          # Business domain features
    ├── discount_calculator/
    │   ├── screens/
    │   ├── widgets/
    │   └── providers/
    ├── sales_price_calculator/
    │   ├── screens/
    │   ├── widgets/
    │   └── providers/
    ├── product_inventory/
    ├── sales_history/
    ├── home/
    └── welcome/

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State Management with Provider

Numix uses the provider package for state management, combined with shared_preferences for data persistence. This ensures:
  • Efficient rendering: Only widgets that need updates are rebuilt
  • Data persistence: Your inputs and calculations survive app restarts
  • Clean code: Separation between business logic and presentation
The application enforces proper use of context.read() for triggering events and context.watch() or Consumer for reactive UI updates to maintain 60/120 fps performance.

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What Makes Numix Different?

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Error-Safe by Design

Every calculation is wrapped in error handling. Invalid inputs are caught and displayed to users with clear error messages instead of causing crashes.

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Persistent State

Your work is automatically saved. When you close and reopen the app, your last calculations are still there, ready to continue.

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Material Design 3

Built with Flutter’s Material Design 3, Numix provides a modern, intuitive interface with both light and dark theme support.

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Cross-Platform

As a Flutter application, Numix runs natively on both iOS and Android devices with a single codebase, ensuring consistent behavior across platforms.

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Get Started

Ready to start using Numix? Head over to the Installation guide to set up your development environment, or jump straight to the Quickstart to get the app running in minutes.

Installation

Set up your Flutter environment and install Numix

Quickstart

Get up and running with Numix in 5 minutes

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