A precise online stopwatch with lap time recording. Track time with millisecond accuracy, record splits, and analyze your timing data.

Calculate diameter, circumference, surface area and volume of a sphere from any known parameter. Supports multiple units.

Format and validate JSON data with syntax highlighting. Beautify minified JSON or compress formatted JSON with a single click.

A simple, client-side click counter with adjustable step sizes and optional sound effects. Ideal for quick counts, surveys, or presentations requiring real-time interaction.

Create custom QR codes with logos, colors and adjustable sizes.

Get detailed information about your device, including screen size, pixel ratio, user agent, and more. Useful for developers and designers.

Comprehensive bilingual financial terminology dictionary with explanations and related term recommendations.

Calculate your GPA, final exam score needed, and average grades with this comprehensive grade calculator. Perfect for students and teachers.