WEB TOOLS
Web tools
Free, browser-based calculators and converters. No install, no account — just tap one to open it.
Calculator
A clean, everyday calculator with basic operations and percentages.
Talking Calculator
An accessible calculator that reads calculation results aloud.
Clock
A clean, easy-to-read analog + digital clock for everyday use.
Japanese Era Converter
Convert between Japanese eras and the Gregorian calendar.
Sphere Calculator
Calculate a sphere's surface area and volume from its radius.
Base-n Converter
Convert between binary, octal, hex, and any base-n number.
Counter
A simple tally counter for counting anything, one tap at a time.
World Capital Quiz
Test how well you know the world's capital cities.