Country Flag Quiz by Shape - Online Guess the Nation
See a flag and pick the country among four choices. Timed rounds with score. Perfect for geography buffs. Local data.
UD5 Toolkit
See a flag and pick the country among four choices. Timed rounds with score. Perfect for geography buffs. Local data.
A silhouette of a country appears; type the name. Timed guesses. Great for geography buffs.
A country border shape appears, guess the nation. Multiple choice. Score tracking. Learn geography visually. Local SVG shapes.
Test your knowledge of world capitals. Multiple choice, timed rounds. Improve your geography skills. No data collection.
Test your knowledge: given a state name, pick its capital. Timed, with scoreboard. Learn all 50. No login.
Interactive quiz to learn all 50 US state capitals. Choose mode: capital to state or state to capital. Map highlight available. Works offline.
Click for a random general knowledge question, then reveal the answer. Covers science, history, pop culture.
Find the threeβletter currency code (USD, EUR, JPY) for any country. Also lists currency symbol and name. Static.
Generate a unique and humorous campsite name for your tent. Great for scout trips or backyard camping.
Calculate the bearing (azimuth) and distance between two GPS coordinates using the Haversine formula. Great for orienteering. Local only.
Enter the song's key and playing position (straight/cross harp) to determine which harmonica key to use.
Play the classic Connect Four in your browser against a friend or CPU. Drop discs to get four in a row. Clean SVG board, local logic.
Paste a hex code and get the closest official CSS color name and a list of similar Pantone-like shades. Design reference.
Enter your hand and dealer's up card to see optimal move (hit, stand, double, split) using basic strategy. Educational casino reference.
Encode or decode data to/from Base58 (Bitcoin alphabet). Useful for cryptocurrency address generation testing. Fully local, no data sent.
Paste an SVG path d string and parse it into an array of commands and coordinates. Useful for animations.
Drag a slider along the pH scale to see examples of solutions at that pH and the concentration of HβΊ and OHβ» ions.
Calculate exact elapsed time between two dates in years, months, weeks, and days. Countdown or time already passed. Simple, visual, and local.
Paste an URL or HTML and see the h1βh6 hierarchy as a tree. Detect skipped levels and improve accessibility. Clientβside.
Calculate the exact number of days, weeks, months, and workdays between two dates. Visual calendar highlights. Perfect for projects.
Enter two dates and see the exact number of days, weeks, and workdays between them. Also shows the countdown or days since.
Paste a SQL CREATE TABLE statement and extract just the column names as a CSV header row. For data migration.
Seamlessly convert JSON objects into valid XML documents. Control root element naming and attribute formatting. Entirely local, keeping your data safe.
Fill in a thesis statement, arguments, evidence, and get a structured essay outline. Print.
Select project type and leather weight to get recommended stitch spacing and thread size.
Structure your episode with timed segments. Includes call to action notes. Export as text.
Drop a PDF and automatically detect tables. Export them to CSV or copy to clipboard. Works locally using PDF.js.
Generate a random sequence of button presses that looks like a retro game cheat code. Totally useless, totally fun.
See a random color and type its name. Score based on accuracy. Fun for designers. Local.
Combine two random elements and get a surprising result. Inspired by Little Alchemy. Infinite ideas. All local.