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Tip Calculator
Calculate tip amounts and split the bill. Supports custom tip percentages and splitting between any number of people.
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Percentage Calculator
Calculate percentages, percentage change, percent of a number, and percentage increase/decrease. Fast, accurate, and free.
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.