Introduction
Welcome to the UwU Apps API documentation. This is a free, serverless REST API providing a wide range of utility services — from calculations and conversions to random content, Singapore-specific data, and more.
What's available
Age, BMI, days between dates, interest, aspect ratio
Temperature, weight, base numbers, morse code, currency, ciphers, encoding
Password strength, color contrast (WCAG)
Passwords, QR codes, gradients
Validate, generate, and reconstruct Singapore NRICs
Validate and generate Singapore UENs
Validate and generate Singapore car plates
Predict gender, age, and nationality from a name
Jokes, Pokémon, images, quotes, dice, coin flips, and more
Movies, recipes, cocktails, countries, words, images
Singapore bus arrivals, bus stops, and air quality (PSI)
Browser and OS detection
QR code scanning
CAPTCHA generation and verification
Quick start
All endpoints are HTTP GET requests (except QR scanning which is POST). Parameters are passed as query strings.
See Getting Started for full details on base URLs, response formats, and error handling.
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