A collection of free online tools for testing, development, and productivity.
Create customizable social media posters for observance days with text, date, and background customization. Try it online
Features: Customizable text/date, font controls, Unsplash integration, PNG download
Environmental awareness poster creator with custom backgrounds and text styling. Try it online
Features: Custom backgrounds, text styling, font/layout adjustment, PNG export
Test SSE endpoints with real-time message viewing and story mode. Try it online
Features: Real-time messaging, story mode, connection status, error handling
Execute and test Lua scripts with Redis using Monaco Editor. Try it online
Features: Syntax highlighting, argument support, execution results, error debugging
Calculate exam scores with negative marking support for competitive exams. Try it online
Features: Negative marking options (1/2, 1/3, 1/4, 2/3), instant score calculation, percentage display
Calculate how long you've lived and share with friends. Try it online
Features: Real-time countdown, shareable links, days/hours/minutes/seconds display
3x3 sliding puzzle game with custom image upload support. Try it online
Features: Custom image upload, move counter, completion celebration
Classic 9x9 Sudoku game with validation and completion effects. Try it online
Features: Interactive number input, validation, confetti on completion, mobile-friendly
- Frontend: Astro, React, Vue, Svelte
- Styling: Tailwind CSS, Headless UI
- Graphics: react-konva, Canvas API
- Backend: Go (Redis/SSE servers), Next.js
- Deployment: Vercel