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World flags with country codes, flag emoji, flag images, region, capital, population, and independence status.

Major world cities with population, coordinates, timezone, and notable characteristics.

SI and common measurement units with conversion factors — length, mass, volume, temperature, speed, energy, pressure, area, and more.

Superhero data including powerstats, appearance, biography, and connections from the SuperHero API.

All 118 chemical elements with atomic properties, classifications, electron configurations, and discovery information.

Major world languages with ISO 639 codes, language families, writing scripts, and approximate speaker counts.

All HTTP response status codes from the IANA registry — informational, success, redirection, client error, and server error classes.

Dog breeds with physical characteristics, temperament, breed groups, and images from TheDogAPI.

ISO 4217 currency codes, names, symbols, and country associations for all active world currencies.

World countries with ISO 3166 codes, capitals, regions, currencies, languages, calling codes, and time zones.

All 148 CSS named colors with hex, RGB, and HSL values, grouped by color family.

Cat breed data from TheCatAPI — breed characteristics, temperament, origins, and trait scores.

Trivia questions across multiple categories from the Open Trivia Database.

Vehicle makes and models from NHTSA's vPIC (Vehicle Product Information Catalog) API, covering major manufacturers and recent model years.

Common Japanese vocabulary from JLPT N5 and N4 levels — words, readings, English definitions, and parts of speech sourced from the Jisho.org dictionary API (powered by JMdict).