Roman Numeral Converter — Convert an integer (1..3999) to Roman numerals or back.
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Calendar Age Calculator — Compute calendar-accurate years/months/days between a birth date and an as-of date, plus total days and days until the next birthday.
Number to English Ordinal — Format a non-negative integer with its English ordinal-indicator suffix (1 -> '1st', 11 -> '11th', 21 -> '21st').
Seeded Dice-Notation Roller — Roll tabletop dice notation ('2d6+3') deterministically from a required seed (sha256-derived, reproducible on any Python version)
ISO 8601 Duration Parser — Parse an ISO 8601 duration literal (e.g. 'P1Y6M4DT12H30M5S') into years/months/weeks/days/hours/minutes/seconds, plus an exact total_
Duration Breakdown Calculator — Elapsed time between two ISO 8601 timestamps broken into weeks/days/hours/minutes/seconds, plus running totals.
Unit Price Comparator — Compare 2+ products' price-per-unit across mass/volume/count, converting units within the same dimension, and flag the best value.