Country Outline Quiz - Online Identify by Shape
A silhouette of a country appears; type the name. Timed guesses. Great for geography buffs.
UD5 Toolkit
A silhouette of a country appears; type the name. Timed guesses. Great for geography buffs.
See a flag and pick the country among four choices. Timed rounds with score. Perfect for geography buffs. Local data.
Find the threeβletter currency code (USD, EUR, JPY) for any country. Also lists currency symbol and name. Static.
Interactive quiz to learn all 50 US state capitals. Choose mode: capital to state or state to capital. Map highlight available. Works offline.
Test your knowledge: given a state name, pick its capital. Timed, with scoreboard. Learn all 50. No login.
Enter a URL and see a nested list of all headings (h1βh6). Check your document structure for SEO and accessibility. Pure fetch.
Paste an URL or HTML and see the h1βh6 hierarchy as a tree. Detect skipped levels and improve accessibility. Clientβside.
Enter a domain and see public WHOIS info via a free API with rate limiting. Quick domain check.
Place multiple grid items into the same cells to create overlapping layouts. Learn the technique visually. Copy code.
Generate a CSS background that shows a baseline grid. Adjust lineβheight and offset. Perfect for aligning text.
Practice CSS selectors by targeting plates on a virtual restaurant table. 30+ levels. Perfect for beginners.
Paste a hex code and get the closest official CSS color name and a list of similar Pantone-like shades. Design reference.
Convert a simple black and white image into an SVG path using edge detection. Extract vector outlines. Local canvas processing.
Start/stop timer per project to log hours. See daily and weekly totals. Data stays in localStorage. Export summary as CSV. No account needed.
See how alignβitems: baseline works in grid to align different font sizes on the same baseline. Visual guide.
Pick a color for each day's mood and see a monthβatβaβglance heatmap. Data stored locally. A private emotional log.
Practice aligning grid items and tracks with the placeβitems, alignβcontent, and justifyβcontent properties. Visual guide.
Enjoy classic Tetris in your browser. Rotate, move, and drop tetrominoes. Clear lines and score. Fully local JavaScript.
Record daily systolic/diastolic readings and pulse. See a trend chart. All data saved locally in your browser.
Check WHOIS information for any domain: registrar, expiration date, and name servers. Quick and private using public WHOIS data aggregators.
Scroll a container and see how sticky elements behave. Adjust top, bottom, and scroll margins. Copy the code.
Answer questions and see typical milestones for 0-5 years. Educational reference for parents. Not a diagnostic tool.
Paste an SVG path d string and parse it into an array of commands and coordinates. Useful for animations.
Log the hours you slept each night and rate the quality. See a weekly bar chart. Local storage.
Use SSML <mark> tags to fire events during TTS. See text highlighted as it is spoken. Understand speech synthesis timing. local.
Keep track of stitches and rows for your knitting projects. Multiple counters with increase/decrease shortcuts. Data saved in your browser.
Lay down a beat on a grid sequencer for kick, snare, and hi-hat. Play, loop, and adjust tempo. All sound via Web Audio API.
Every second, the background color changes to the hex code corresponding to the current time (HHMMSS). A beautiful, everβchanging clock.
Create a breadcrumb schema for your website. Fill in the pages and get the readyβtoβpaste JSONβLD snippet for rich results.
Encode or decode data to/from Base58 (Bitcoin alphabet). Useful for cryptocurrency address generation testing. Fully local, no data sent.