The Truth or Dare API generates random truth questions and dare challenges for the classic party game. Features 400+ unique prompts with per-API-key tracking to avoid repeats.

Truth Table Generator creates complete truth tables for boolean expressions with support for AND, OR, NOT, XOR, NAND, and NOR operators.

ULID Generator creates Universally Unique Lexicographically Sortable Identifiers that order records chronologically. Pass an optional batch count and millisecond timestamp to produce 26-character collision-resistant unique IDs with format details.

Unemployment Rate looks up labor statistics by two- or three-letter ISO country code. It returns the country name, reporting year, and record count, with paid plans adding historical annual rates.

Unicode Escape/Unescape converts text into Unicode escape sequences or restores escaped strings back into readable characters. Send any string to get the transformed text and total character count.

Unicode Character Lookup is a Unicode lookup API that inspects any character, symbol or hex codepoint to find its decimal value, hex notation, and UTF-16 encoding. The response also identifies the character category and supplies names for emoji.

Unit Converter converts values between different units of measurement. Pass a numeric value with source and target unit identifiers to get the converted result and unit abbreviations.

Unix Timestamp Converter converts Unix timestamps into formatted dates and parses ISO 8601 strings back into epoch seconds. Responses break down dates into ISO 8601, RFC 2822, simple time strings, and individual calendar components like year, month, and hour.

URL Encoder/Decoder converts text into percent-encoded strings or decodes existing URL components back into plain text. Pass any string with an encode or decode action to receive the processed output and your original text.

URL Lookup resolves any web address to its hosting server IP address, country, and continent in real time. Paid plans add city, state, coordinates, timezone, and EU membership status.

URL Title fetches the HTML title tag of any web page in real time from a target URL. Paid plans also retrieve an array of every H1 heading tag found on the page.

URL to Markdown converts any webpage URL into structured Markdown text. Each response delivers the page title, converted text, word count, and element counts, with paid plans adding optional link and image syntax.

URL Unshortener expands shortened links to reveal their final destination URL and destination domain. Send any short link to inspect the resolved address and redirect count; paid plans add the full redirect chain.

USB Vendor Lookup allows you to identify USB device manufacturers and products by their vendor ID and product ID. It uses the Linux USB ID Repository, which contains thousands of USB vendor and product identifiers.

User Agent Generator creates realistic user agent strings for desktop, mobile, and tablet devices. Each request outputs the complete string with parsed browser and operating system names and versions, while paid plans add engine and CPU details.

User Agent Parser parses user agent strings to extract browser, operating system, and hardware details. It identifies device types, CPU architecture, and bot traffic, so you can run user agent detection on every incoming HTTP request.

Username Generator creates handle suggestions from a person's name or email address. It returns an array of suggested usernames based on the input, while paid plans can request multiple options at once.

Username Profanity flags offensive or inappropriate usernames before they reach your database. Send any candidate handle to receive a clear true or false profanity check result.

UTM Coordinate Converter provides bidirectional conversion between UTM (Universal Transverse Mercator) coordinates and latitude/longitude using WGS84 datum.

UUID Generator is a UUID generator API that produces random RFC 4122 version 4 UUIDs on demand. Request single IDs or batches in standard lowercase, uppercase, or strings without hyphens.