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Speed Converter
Convert between speed units: mph, km/h, knots, m/s, ft/s, and Mach. Fast, accurate speed unit conversion for any need.
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Unit Converter
Convert between length, weight, temperature, speed, and data units. Fast, accurate, and easy to use.
QR Code Generator
Generate QR codes for URLs, text, email, phone numbers, and WiFi. Download as PNG or SVG for free.
Schulte Grid — Attention Training
Train your focus and peripheral vision with the classic Schulte Grid. Click numbers 1 to N in ascending order as fast as you can. Multiple grid sizes from 3×3 to 7×7.
Date Difference Calculator
Calculate the number of days, weeks, months, and years between two dates. Useful for schedules, planning, and deadlines.