Developer tools that
respect your time.

Compare two text blocks and see exactly what changed. Split or unified view.

Paste JSON and explore it as an interactive node graph. Zoom, pan, inspect any node.

Test regex patterns live with match highlighting, capture groups, and a recipe library.

Test REST APIs with all HTTP methods, custom headers, request body, and a full response inspector.

Live preview markdown with Mermaid diagrams, math (KaTeX), GFM tables, and scroll sync.

Preview SVGs and convert to typed React components with props. Drop an SVG file or paste code.

Paste a cron expression and instantly see a human-readable schedule, next run times, and a calendar heatmap.

Drag-and-drop system design and cloud architecture diagrams. AWS, infra, and tech stack on an infinite canvas. Export as PNG.

Decode any JWT locally — color-coded header, payload and signature with claim descriptions, live expiry countdown, and security warnings. Nothing leaves your browser.

All text encodings in one live view — Base64, URL, HTML entities, UTF-8 hex, Unicode escapes, and SHA-256 hash. Bidirectional, client-side only.

All the conversions developers reach for daily: Unix timestamps, byte sizes, color formats (hex↔RGB↔HSL + WCAG contrast), and number bases with a 32-bit bit viewer.