Generator Function Explorer - Online Step by Step
Write a generator function and step through it with next(). See values and done state. Understand iterators.
UD5 Toolkit
Visualize an estimated network hop path from your device to any destination
Simulation for learning & demonstration purposes only
traceroute (or tracert on Windows) command in a terminal.Write a generator function and step through it with next(). See values and done state. Understand iterators.
Enter a full URL and get all query parameters in a clean table with decoded values. Quickly see UTM and tracking params.
Explore the contents of the Cache Storage API for your domain. See cached requests and their sizes. Debug offline apps.
Create a shadow that appears when a container is scrollable. Pure CSS using background attachments. Copy the style easily.
Build a conic gradient with any number of color stops. Visual editor. Ideal for creating pie charts or colorful spinners.
Plan a party or event budget by category (venue, food, decorations). See total and cost per guest. Export summary.
Generate an <img> tag with the loading='lazy' attribute and optional low‑quality placeholder. Improve Core Web Vitals. Copy the snippet.
Place two containers side by side to see how inline‑flex differs from flex. Understand block vs inline formatting.
Enter the characters you need and generate a smaller font file from a TTF/OTF. Keep only the glyphs you use. Using harfbuzz WASM.
Generate random truth questions and dares for game night. Categories for kids, teens, and adults. No repeats, all client-side fun.
Load images or use colors and apply all 15 CSS blend modes. Visual tester for creative effects.
Build a combination resistor network by adding series/parallel groups and get total resistance. Visual circuit.
Animated circle guides your breathing: breathe in, hold, breathe out. Customizable ratios (e.g., 4-7-8). Soothing colors, optional bell sound. Purely local.
Enter a decimal number and see a visual breakdown of bits, place values, and bitwise operations. Learn binary easily.
Add multiple CSS filters (grayscale, blur, hue‑rotate) to an image. See the combined effect. Copy the CSS filter value.
Send HEAD requests to popular websites and measure the round‑trip time. Quick network health check. Client‑side.
See how grid-auto-flow: row vs column changes item placement. Add and remove items to understand the algorithm. Visual.
Drag items into grid cells and see the resulting grid‑area or line‑based placement code. Learn how auto‑placement and spanning work.
Add rows and columns, merge cells, and set gaps visually. Get the grid‑template CSS and HTML. Fast layout prototyping.
Choose a property, duration, and bezier curve. Trigger the transition and see the animation. Copy the complete CSS rule.
Test how your page loads under slow, 3G, or offline conditions by intercepting fetch and applying delays. No DevTools needed.
Connect oscillators, gain nodes, and filters with a visual graph. Hear the result in real time. Learn Web Audio interactively.
Enter text and see each character's 8‑bit binary laid out in a black‑and‑white grid. Beautiful data art. Local.
Evaluate password strength through a short interactive story where each character set adds lines to a narrative. Educational fun.
Click to see a famous physics formula rendered in LaTeX, with a short description. For daily science inspiration. All local.
Enter a CSS selector and see its specificity broken down into A,B,C columns with a visual weight comparison. Learn specificity.
Measure your internet connection speed by downloading and uploading a small test file. Works from your browser.
Attempt to detect your current DNS resolver IPs using DNS‑leak test queries. Educational. Privacy‑friendly.
Build a simple decision tree by adding yes/no nodes. Flowchart style. Export as text outline.
Enter a number and see its Collatz sequence graphed. Watch the steps until it reaches 1. Mesmerizing math.