Online Metronome with Subdivisions - Precise Rhythm Trainer
Play a metronome with adjustable BPM, time signature, and subdivisions (eighth, triplet, sixteenth). Tap tempo and visual flash. Works offline for practice.
UD5 Toolkit
Design, visualize & practice touch typing with custom layouts
Play a metronome with adjustable BPM, time signature, and subdivisions (eighth, triplet, sixteenth). Tap tempo and visual flash. Works offline for practice.
Paste two Markdown texts and see a sideβbyβside diff with rendered preview. Perfect for editing and collaboration.
Paste a GraphQL SDL schema and get autoβgenerated Markdown documentation. Perfect for API docs. All local.
Paste Markdown and get warnings for common mistakes: inconsistent heading spacing, bare URLs, and broken links. All local.
Paste your Swagger/OpenAPI YAML and see a rendered API documentation preview with expandable endpoints. All local rendering.
Upload a 512x512 logo and get resized icons for every PWA requirement. Download a zip and the corresponding manifest.json snippet.
Generate a series of semantic version tags with optional prefixes. Copy for your release script. Consistent tagging.
Write and run simple Sinclair BASIC programs in a browser-based ZX Spectrum emulator. Load demo programs and experience 80s computing. Educational fun.
Pick a package name and generate a custom version or download badge as a static image or Markdown link. For readme files.
Enter total rail length and baluster width to get exact spacing for code compliance. Visual layout.
Translate YAML configuration files into JSON format instantly. Validate syntax during conversion. Perfect for DevOps and configuration management. Secure client-side operation.
Paste JSON-LD and validate basic syntax and required properties for Article, Product, etc. Local only. Instant feedback.
Validate if a version string follows SemVer 2.0.0. Also sort and compare versions. Developer tool.
Validate and compare semantic version strings. Check if a version satisfies a range (e.g., ^1.2.3). Visual breakdown of major.minor.patch. Local only.
Test SQL injection inputs on a mock database and see the resulting query. Learn how to prevent SQLi. No real data.
Parse XML strings into compact JSON representation. Handles attributes and text nodes intelligently. Quick and private, ideal for API response translation.
Drag a slider to see wind speed in knots/mph/kmh and the corresponding sea conditions and land effects.
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.
Design a layout where nested grids share track sizes with their parent via subgrid. Copy the complete CSS.
Watch a simulation of how the JavaScript event loop handles synchronous code, microtasks, and macrotasks. Learn async.
Press any key combination and record the sequence. Export as JSON or humanβreadable text. Perfect for documenting shortcuts.
Press any key to see the complete KeyboardEvent properties: key, code, keyCode, modifiers. Indispensable for game & shortcut developers.
Add, remove, push, pop items and watch the data structure change visually. Supports arrays, stacks, and queues. For CS students.
Paste long text and split it into 2, 3, or 4 balanced CSS columns. Preview and copy HTML/CSS. For magazine layouts.
Paste a JSON object and see a dynamic, draggable tree graph representation. Excellent for debugging nested data.
Type a password and see a bar that fills based on estimated bits of entropy. Colorβcoded feedback. No storage.
Create a multiβcolumn text layout with adjustable column count, gap, and rule. Copy the CSS. Elegant reading experience.
Enter two tire sizes and see a sideβbyβside comparison of diameter, width, and speedometer error. Local math.
Upload an audio clip and generate an animated GIF of its waveform dancing. Shareable sound snippet. Canvas magic.