holpxay n. [hol.ˈp’aj] number.
A notepad calculator where math just works. Type expressions, see results instantly.
Arithmetic & Numbers
+, -, *, /, ^, !, mod, and parentheses×, ·, ÷50%, 200 * 15%), scientific notation, underscore separators0xFF), binary (0b1010), octal (0o777), arbitrary bases (ABC base 16)pi, e, phi) and functions (sin, cos, sqrt, log, round, abs, random, …)Units & Conversions
5 km + 500 m, 100 ft^2 + 5 m^260 km/h, 9.8 m/s^2, 50 watts per square meter5 ft 7 in, 2 hr 30 min 15 secto, in, as, ->, →171 cm to ft in150 apples / 30 apples/dayDate & Time
today, 3 days ago, 2 weeks from now)now + 100 days, 2038 Jan 19 - today18:30 Tokyo, now in London, UTC offsets1700000000 unixtoday to weekday, now to hourCurrency
100 USD + 50 EUR, 100 USD to JPY150 USD/person * 4 personVariables & Conditionals
price = 49.99&&, ||, !if 5 > 3 then 100 else 200&, |, xor, ~, <<, >>Output Formats
to hex, to binary), fractions, scientific notation, percentages, ordinalspi to 2 decimals, 12345 to 3 sig figsEditor
#)Trivia
This app is 70% written by Claude Opus 4.6 with constant human supervision and intervension.
Initally it was planned to be written 90+% by Claude, but I had to jump in and change the direction of deployment mid-way due to the way it has complicated the architecture.
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