The Expression Evaluation API is a versatile natural language calculator that can evaluate mathematical expressions and return the results in plain text. Simply input the expression to be evaluated, and the API will scan and compute the calculation, making it an easy-to-use tool for developers who want to incorporate a calculator function into their applications.

Test a regular expression against an input text and get every match with capture groups and named groups. Patterns run in an isolated worker with a hard time limit, so catastrophic patterns are stopped safely.

Parse any scheduler expression, get the next execution times in any world time zone, and a plain language description of the schedule. Validate schedules before they reach production.

Unleash the language of the streets with the Urban Dictionary API. Dive into the vibrant world of slang definitions with ease. Fetch random words, explore the Word of the Day, search for specific definitions, and embrace the ever-evolving lexicon of modern culture. The ultimate resource for urban linguists.

The Clever Riddles API delivers a diverse collection of thought-provoking and entertaining riddles. Perfect for enhancing entertainment apps, it provides high-quality riddles designed to engage users with humor, mystery, and mental challenges. Spark curiosity and elevate user experience with a steady stream of clever enigmas.

Automatically expands shortened links into their full, original form—ideal for transparency, security checks, or analyzing hidden redirect chains in marketing campaigns.

Input any shortened URL and retrieve the real, unmasked destination instantly with this API—perfect for link audits, previews, or safety inspection.

ExchangeEase API: Real-time exchange rates, comprehensive currency support, and seamless integration for precision in global transactions. Streamline financial operations effortlessly.

Transform facial expressions in images with advanced editing technology, enabling smiles, pouts, frowns, and more with our API.

Instantly expand any shortened URL to reveal the original destination link, improving transparency, trust, and preventing phishing or suspicious redirections in one call.

Protect your financial exposure with our Comprehensive Comprehensive EU Building Energy Compliance API for Financial Exposure ensuring robust compliance across all standards.

Gain valuable insights into building energy compliance with our Developer Insight Developer Insight EU Building Energy Compliance API for informed decisions.

Integer and floating-point edge cases: int32/int64 limits, NaN, infinity, denormals, and IEEE 754 rounding. Deterministic seeds, and every value explains what it breaks.

Canonical injection test strings for checking your own escaping: SQL tautology, XSS, path traversal, template injection. Harmless probes, not working exploits. Reproducible seeds.

Date and time edge cases: Feb 29, DST gaps, year 2038, leap seconds, and quarter-hour UTC offsets. Reproducible seeds, and every value explains what it breaks.

Unicode test data for internationalization testing: combining marks, bidi overrides, ZWJ emoji, homoglyphs. Deterministic seeds, and every value explains what it breaks.

Expand and manipulate calendar occurrences effortlessly using the Expand Expand Calendar Occurrences RRULE API.

Expands an iCalendar RRULE into occurrence dates between a start and end time.

Streamline your calendar's scheduling process with our Calendar Scheduling Occurrences Calendar Scheduling Occurrences RRULE API.

Simplify recurring event management with our Occurrence Recurring Events Occurrence RRULE API for seamless integration.

Easily generate and manage iCalendar recurrence rules with this powerful iCalendar Recurrence Rule RRULE API.

Ensure your calendar meets RFC 5545 standards with our compliant RFC 5545 Compliant RRULE API for accurate scheduling.

Access precise timestamps for recurring events with the Recurrence Rule Timestamp Recurrence Rule Timestamp RRULE API.

Utilize the DTSTART-based approach for effective recurrence management with our DTSTART Based Recurrence RRULE API.

Schedule weekly events with precision using the Weekly BYDAY Recurrence Weekly BYDAY Recurrence RRULE API.