Captcha Generator generates visual captcha challenges with signed image URLs and text solutions. Each request delivers a challenge image, its correct answer string, an expiration timestamp, and a unique identifier.

Card Deck Shuffler randomizes standard playing card decks using Fisher-Yates or riffle algorithms. Pass the deck count and optional jokers to get the full ordered cards with rank, suit, shorthand symbols, and the top card.

Test Card Generator creates card numbers that pass format and checksum validation, for testing checkout forms and payment UIs across major networks. They aren't real cards: no bank issued them, and they can't be charged or used to buy anything. Specify a brand to receive card numbers, security co...

Card Validator is a credit card number validator API: it checks whether a card number is valid, identifies the card brand, and flags risk. It runs the Luhn checksum, detects the scheme (Visa, Mastercard, Amex and more), returns the PCI-safe BIN and last 4 digits, flags known processor test cards,...

US Car Models is a car make and model API for vehicles sold in the United States from 1984 to present. List models by make on any plan, while paid plans add year filters, trims, fuel economy (MPG), engine details, and transmission specifications.

Cash Flow Statement returns operating, investing and financing cash flows for a US public company by ticker - straight from SEC filings, with free cash flow, FCF margin and cash-conversion metrics calculated for you.

Charades Generator provides random words from curated categories perfect for playing the classic charades acting game.

Chart Generator is a chart API that turns your data into chart and graph images. Supports bar, line, pie, doughnut, radar, and polar area charts with customizable styling.

Chess Move Validator verifies algebraic chess notation and identifies move types including castling, captures, checks, and promotions.

Chinese Zodiac returns the zodiac animal, element, and characteristics for any birth date. Accurately accounts for the Chinese lunar calendar - the zodiac year starts on Chinese New Year, not January 1st.

Chuck Norris Jokes delivers a random Chuck Norris joke on every request without requiring any query parameters. Each call returns plain joke text ready to display in bots, command-line interfaces, or entertainment feeds.

Cities Lookup is a city search API that searches over 150,000 global cities to find country codes, population counts, and city size classifications by name. Paid plans add GeoJSON coordinates and custom match limits.

Cocktail Recipe retrieves cocktail recipes by drink name or ingredient, providing measured ingredients, preparation instructions, and recommended glassware. Responses include serving categories and ingredient counts, with support for pulling random drinks.

Code Detector identifies the programming language of any submitted code snippet. It returns the canonical language name, readable title, and standard file extension for the detected code.

Coin Flipper simulates random coin flips and records heads or tails outcomes with flip counts. Paid plans can simulate multiple flips per request and calculate percentages, streak lengths, and fairness indicators.

Color Brightness Calculator checks hex color brightness to classify values as light, dark, or medium, returning RGB components. Paid plans add WCAG contrast ratios, luminance scores, and recommended text colors.

Color Converter translates color values across hex, RGB, CMYK, and named inputs into standard RGB formats and channel breakdowns. Paid plans expand output to include CMYK, HSL, ANSI 16-color codes, and recognized English color names.

Color Name Finder matches any hex color code to its closest named CSS color. Send a hex value to get the matching color name, RGB coordinates, and an exact match flag.

Color Palette Generator produces harmonious color schemes from any HEX base color. It returns color codes in HEX and RGB formats, naming matches, dark-mode flags, and recommended text colors.

Color Similarity Calculator measures color similarity between two hex values. It returns an overall similarity score, a categorical match rating, and RGB and HSL channel breakdowns, while paid plans add Delta E and color distance metrics.