Cash Stack Visualizer – Online See How Much $1 Billion Looks Like
Enter an amount and see a virtual stack of $100 bills with height comparison to everyday objects.
UD5 Toolkit
Enter an amount and see a virtual stack of $100 bills with height comparison to everyday objects.
Simulate paint colors on a pre-loaded room photo by adjusting hue, saturation. Find your perfect shade before buying. Local canvas.
Define password rules and see a live checklist that updates as you type. Design better password UX for your app.
Touch your screen and see the pressure and radius reported. Visualize force. Mobile developer tool.
Enter a simple regular expression and see its equivalent Deterministic Finite Automaton diagram. Learn how regex engines work.
Plot different Big‑O complexities on a chart. See how O(log n) stays flat while O(2^n) explodes. Educational reference.
Press any key combination and see the human‑readable shortcut for macOS and Windows. Developer docs helper.
See the complete recursion tree for small Fibonacci or factorial calculations. Understand overlapping subproblems. Educational.
Highlight elements with aria‑describedby and see the linked description text. Verify a11y annotations.
Paste a website's HTML and see which text is only visible to screen readers (e.g., .sr‑only). Preview the accessible layer.
Pick two colors and mix them in different color spaces with sliders. See the difference between sRGB and OKLCH mixing. Copy the code.
Start from a base color and use `oklch(from color l c h)` to create lighter or darker variants. Copy the code.
Watch a simulation of how the JavaScript event loop handles synchronous code, microtasks, and macrotasks. Learn async.
Call navigator.storage.estimate() and display a visual pie chart of used vs. available browser storage. For PWA debugging.
Enter two tire sizes and see a side‑by‑side comparison of diameter, width, and speedometer error. Local math.
Add, remove, push, pop items and watch the data structure change visually. Supports arrays, stacks, and queues. For CS students.
Type a password and see a bar that fills based on estimated bits of entropy. Color‑coded feedback. No storage.
Paste a JSON object and see a dynamic, draggable tree graph representation. Excellent for debugging nested data.
Adjust margin, border, padding, and content sizes interactively and see the rendered box model. Get the exact CSS. Teach or learn layout.
Draw walls on a grid and watch A*, Dijkstra, or BFS find the shortest path. Interactive animation. Learn graph traversal.
Watch classic sorting algorithms step through a randomized bar chart. Adjust speed and array size. Great for learning algorithm efficiency.
See interactive Venn diagrams for SQL JOINs: INNER, LEFT, RIGHT, FULL, CROSS. Understand set theory visually. Local static site.
Visualize audio in real time from your microphone or uploaded audio file. See the waveform dance. Uses Web Audio API locally.
Upload a small file to see each byte as a block, color-coded by value. Visualize the structure of binary data. Client-side.
Upload an audio clip and generate an animated GIF of its waveform dancing. Shareable sound snippet. Canvas magic.
Enter a regular expression and see a visual railroad diagram explaining the pattern. Learn and debug regex.