A comprehensive collection of 100+ free online calculators and converters built with Next.js 14.
- 100+ Tools - Finance, Health, Home & DIY, Unit Converters, Productivity
- Fast & Lightweight - Static generation for optimal performance
- Mobile Responsive - Works seamlessly on all devices
- No Ads, No Signup - 100% free to use
- SEO Optimized - Built-in sitemap and meta tags
| Category | Examples |
|---|---|
| Finance | Mortgage Calculator, Compound Interest, ROI, Tip Calculator |
| Health & Fitness | BMI Calculator, TDEE, Macro Calculator, Sleep Cycle |
| Home & DIY | Paint Calculator, Concrete, Tile, Square Footage |
| Unit Converters | Length, Weight, Temperature, Volume, Currency |
| Productivity | Word Counter, Password Generator, JSON Formatter, UUID |
- Framework: Next.js 14 (App Router)
- Language: TypeScript
- Styling: Tailwind CSS
- UI Components: Radix UI + shadcn/ui
- Icons: Lucide React
- Testing: Vitest + Testing Library
- Validation: Zod
- Node.js 18+
- npm or yarn
# Clone the repository
git clone https://github.com/yourusername/omnitools.git
cd omnitools
# Install dependencies
npm install
# Start development server
npm run devOpen http://localhost:3000 in your browser.
| Command | Description |
|---|---|
npm run dev |
Start development server |
npm run build |
Build for production |
npm run start |
Start production server |
npm run lint |
Run ESLint |
npm run test |
Run tests |
npm run test:watch |
Run tests in watch mode |
npm run analyze |
Analyze bundle size |
npm run lighthouse |
Run Lighthouse audit |
npm i -g vercel
vercelOr connect your GitHub repository at vercel.com.
// next.config.js
module.exports = {
output: 'export'
}npm run build
# Deploy the 'out' directory to any static hostdocker build -t omnitools .
docker run -p 3000:3000 omnitoolsomnitools/
├── app/ # Next.js App Router
│ ├── calculators/ # Calculator pages
│ │ ├── finance/
│ │ ├── health/
│ │ ├── home/
│ │ └── productivity/
│ ├── convert/ # Unit converter pages
│ └── (marketing)/ # Legal pages
├── components/
│ ├── calculators/ # Calculator components
│ ├── converters/ # Converter components
│ ├── layout/ # Layout components
│ └── ui/ # UI primitives
├── lib/
│ ├── calculations/ # Calculation logic
│ ├── constants/ # Tool registry & config
│ ├── conversions/ # Conversion logic
│ └── utils/ # Utility functions
└── tests/ # Test files
- Fork the repository
- Create your feature branch (
git checkout -b feature/new-tool) - Commit your changes (
git commit -m 'Add new tool') - Push to the branch (
git push origin feature/new-tool) - Open a Pull Request
MIT License - feel free to use this project for personal or commercial purposes.