other

Contrast and dark-mode checker for any hex or rgb() input: returns whether a color reads as light or dark and which text color, black or white, stays legible on top of it, alongside full hex/RGB/HSL conversions. Useful for accessible UI generation, theme switchers, and design-system tooling that can't afford a manual eyeball check.

Color format converter for hex codes and rgb() values: get back hex, RGB, and HSL representations plus a light-or-dark classification and the ideal black-or-white text color for readability on top of it. Handy for UI theming, chart palettes, and dashboard generators that need instant, exact color math without guessing at contrast ratios.

Converts a specific wall-clock time from one IANA timezone to another, correctly applying daylight-saving rules for both zones, and returns the converted local time, UTC ISO timestamp, and unix epoch. For coordinating meetings, deadlines, and cron jobs across regions without hand-counting UTC offsets.

Percentage math calculator: find what X% of Y is, what percent one number is of another, or the percent change between two values. Built for pricing markups, discount math, grading, tipping, and reporting agents that need the exact figure instead of mental-math rounding errors.

Unit conversion tool covering length, weight, volume, area, speed, pressure, energy, and digital storage, with exact factors for over 100 unit types. Deterministic and reproducible, so an agent can cite the converted figure directly instead of spending reasoning tokens re-deriving it and risking an arithmetic slip.

Math fact generator for integers: computes a bundle of properties for any number you supply, primality, factorization, perfect-square status, Fibonacci membership, and alternate representations in binary, hex, and Roman numerals. Deterministic and instant, with no external lookup involved. Good for trivia games, validation logic, or satisfying idle curiosity about a specific integer.

Converts between metric and imperial units — meters to feet, kilograms to pounds, liters to gallons, and 100+ other unit pairs across length, mass, volume, and more — with exact factors and no rounding surprises. For international shipping, engineering handoffs, and travel-planning agents.

Date math API: add days to any date (returns resulting date + weekday) or count calendar days and weekday-only business days between two dates. The arithmetic agents get wrong in-context, done deterministically. For deadlines, SLAs, scheduling, and planning.

Number trivia API: the mathematical personality of any integer — prime status, prime factorization, Fibonacci membership, perfect-square check, binary/hex/Roman forms, and digit sum. Instant, deterministic, endlessly curious.

Percentage calculator API: compute 'X% of Y', 'X is what percent of Y', percent change between two numbers, or increase/decrease a number by a percent — the everyday percentage math, done exactly. For pricing, finance, reporting, and analytics agents.

Calculates the great-circle distance between two GPS coordinates in kilometers, miles, and nautical miles, plus the initial compass bearing from point A to point B. For delivery routing, flight-distance estimates, and logistics agents that need an exact figure rather than an eyeballed map distance.

General-purpose measurement converter spanning length, mass, volume, area, speed, pressure, energy, power, and digital storage across 100+ units, with exact conversion factors computed instantly. For engineering specs, recipe scaling, shipping calculations, and any agent translating between metric and imperial systems.

Number facts API: everything mathematically interesting about any integer — is it prime, its prime factorization, Fibonacci membership, perfect-square status, even/odd, binary and hexadecimal forms, Roman numeral, and digit sum. Computed locally, deterministic, instant. For quiz agents, content generation, validation, and the incurably curious.

Temperature conversion API: give a value in Celsius, Fahrenheit, Kelvin, or Rankine and get all four scales back — science-grade, exact, instant. For cooking, HVAC, chemistry, physics, and weather agents.

Text hashing API: SHA-256, SHA-512, SHA-1, or MD5 digest of any text, returned as hex — deterministic, instant, computed locally. For deduplication keys, cache keys, content fingerprints, and integrity checks in agent pipelines.

Reports the current moment in UTC and in any named timezone simultaneously, with unix epoch and day-of-week included, as a live reference point rather than a guess. Useful as a sanity check before scheduling, logging, or timestamping anything an agent produces.

Number base conversion API: convert between any bases 2-36 — binary, octal, decimal, hex, and beyond. Exact, instant.

Would-you-rather question generator: 120 curated dilemmas across categories including an agents-and-ai set written for AI audiences (infinite context vs zero latency), plus tech, philosophy, silly, food, adventure, and superpowers. Returns 1-5 random questions, optionally filtered by category. Clean content, no duplicates.

Current time API: the time right now in any IANA timezone (America/Chicago, Asia/Tokyo...) — local ISO timestamp, UTC ISO, unix epoch, human-readable string, and day of week. The sanity check every scheduling, logging, and coordination agent needs. Deterministic and instant.

Produces random hex strings or alphanumeric secrets, 8 to 128 characters, from OS-grade entropy, alongside batch UUID generation, none of it logged or retained. Useful for session tokens, temporary passwords, API credential material, and one-time codes where true randomness matters more than a pattern an LLM might repeat.

Calculate a percent increase or decrease applied to a number, or the percent change between an old and new value, with exact results every time. For sales and pricing agents, budget variance tracking, and any tool comparing before-and-after figures without approximation.

Timezone conversion API: what is 3pm Tokyo time in Chicago? Convert wall-clock time between IANA zones with DST handled correctly, plus UTC and unix epoch.

Business days calculator API: weekday count between two dates, or add N days to a date and learn what weekday lands. For scheduling, SLA, and deadline agents.

Distance calculator API: great-circle (haversine) distance between two coordinates in km, miles, and nautical miles, plus initial compass bearing. Deterministic and auditable — cheaper than burning reasoning tokens, zero arithmetic-hallucination risk, and the result can be cited. For logistics, travel, delivery, and geo agents. Pairs with /geocode-city for name inputs.