66 tools that aren't a file converter
Plenty of services convert files. But real work interrupts itself: mid-conversion you need square metres, then VAT on a quote, then a meeting time in three time zones.
Rather than open another tab each time, those live in the same window.
What's inside
Unit conversion across 23 domains — length, area, volume, mass, temperature, pressure, energy, speed, angle, data size, fuel economy, illuminance, radiation, viscosity, torque, flow rate, density, force, frequency, time, cooking measures, historical units, paper sizes.
That includes traditional units people still use daily: Korean pyeong, doen, geun; Japanese tsubo, jō, gō; Chinese mu, jin, zhang.
Country-specific maths — VAT and consumption tax, income tax, social insurance, pensions, severance, customs duty, currency. Rates are entered separately for each of the twelve language regions.
Science — the periodic table with 118 elements and around 30 properties each, molar mass, equation balancing, SI prefixes.
Time — world clock, date arithmetic, business-day counting, age, lunar calendar conversion, and a target server clock.
Text and development — number bases, character encodings, hashes, Base64, URL encoding, JSON formatting, regex testing, colour conversion, UUIDs.
The target server clock
Course registration, ticket sales, limited drops — things decided in the space of a second. Your own clock is usually several seconds off, which makes it useless for this.
Give the tool an address and it reads the time out of that server's response headers. Headers only carry whole seconds, so it observes the moment the second ticks over, several times, and narrows down to milliseconds. Measured against Google, the residual error lands under 0.2 seconds.
Pin what you use
Nobody uses all 66. Everyone uses three or four.
Star a tool and it appears on the desktop as an icon, so you never open the toolbox again. There's a search box too — part of a name is enough.