A well-built set of utilities for the everyday work. Fast , minimal and privacy-first .
Simulate protanopia, deuteranopia and tritanopia on images or color palettes.
Pick a color or paste hex, rgb, rgba, hsl, or oklch and convert between formats.
Check WCAG 2.1 contrast ratios in OKLCH and get the closest passing color suggestions.
Visualize and tweak cubic-bezier easing curves with a live preview.
Encode and decode HTML character references — named, decimal and hex.
Format, minify and explore JSON with a collapsible tree view.
Inspect JWT header, payload and signature without leaving the browser.
Write Markdown with live preview, syntax highlighting, Mermaid diagrams, and KaTeX math, all in the browser.
Test Next.js proxy.ts matcher patterns against your site URLs and see which routes get intercepted.
Audit headings, images, word count, robots.txt and links from any URL.
Tune mass, stiffness and damping with a live spring preview and export CSS, Motion or Tailwind code.
Compare two texts and highlight changed lines and characters, entirely in your browser.
Count characters, words, lines and read frequency in real time.
Encode, decode and inspect URLs and their query strings.
Parse any User-Agent string and build realistic ones from presets.
Generate UUID v4 or time-ordered UUID v7 in batches.
Convert between YAML and JSON in both directions, live.