Country Flags is a country flag API that fetches direct download URLs for national flag images using two-letter ISO country codes. Responses return the country name, ISO code, and image link, while paid plans can select SVG or PNG formats and shapes.

Country Languages lists official and commonly spoken languages for any country using its two-letter ISO code. It returns the common country name, formal official name, an array of recognized languages, and the total language count.

Country Lookup matches any country name or ISO code to its official names, ISO 3166 codes, capitals, region, languages, and flag emoji. Paid plans add coordinates and major cities.

County Data Lookup is a county lookup API that retrieves income, poverty rate, and life expectancy for any US county by state and county name. Paid plans add age demographics, educational attainment, health indicators, ZIP codes, and cost of living.

CPI Inflation provides monthly Consumer Price Index data broken down by category including food, housing, transportation, medical care, and more. Includes year-over-year inflation rates for each category.

Cron Expression Generator converts natural language schedule text into standard five-field cron expressions. Submit phrases up to 200 characters to receive the matching cron syntax, with paid plans adding written explanations.

Cron Expression Parser decodes 5-field and 6-field cron expressions into human-readable schedules. Pass any cron string to verify syntax, read plain-language timing explanations, and get the next five execution timestamps.

Crossword Generator is a crossword puzzle API that creates crosswords with intersecting words, numbered clues, and themed word selection.

Cryptogram Generator creates letter substitution cipher puzzles where each letter is replaced with another letter consistently throughout the text.

CSR Parser extracts and analyzes information from Certificate Signing Requests (CSRs), providing detailed subject information, public key details, and fingerprints.

CSV to JSON Converter parses raw CSV text into an array of JSON objects with column names and row counts. It handles comma, semicolon, tab, or pipe delimiters, with optional header row detection.

Cuid Generator creates collision-resistant unique identifiers (CUIDs) on demand for distributed applications. Pass an optional count to receive an array of unique ID strings, with paid plans adding structural format and sortability details.

Currency Converter calculates foreign exchange conversions across 170+ currencies using real-time rates. Pass an amount with source and target currency codes to receive the converted total, exchange rate, and 24-hour trend direction.

Currency Symbols matches ISO currency codes or country names to the countries that use them. Paid plans add the currency symbol, full currency name, ISO numeric code, and decimal precision.

Dad Jokes delivers a random dad joke with every request. Send a plain GET call without parameters to receive a clean punchline ready for display.

DANE Record Validator validates DANE/TLSA DNS records used for certificate authentication, providing security analysis and best practice recommendations.

Data Masking redacts sensitive data like emails, phone numbers, payment cards, IP addresses, and dates using placeholder tokens. It returns the sanitized string and detection counts for each pattern found.

Date Calculator computes the difference between two calendar dates in minutes, hours, days, weeks, months, and years. Supply start and end dates in YYYY-MM-DD format to receive exact interval breakdowns.

Daylight Duration Calculator computes sunrise, sunset times, and total daylight hours for any geographic location and date using astronomical algorithms.

Dice Roller is a dice API that simulates RPG dice rolls using standard notation like 3d6 or 2d20 with optional modifiers. It outputs the individual die outcomes, die count, and the sum of all rolls.