Developer Playgrounds & Sandboxes
Real-time interactive coding environments, visual layout engines, and database query studios. Experiment, prototype, and debug with zero setup, instant feedback, and 100% client-side browser privacy.
JSON Schema Validator & Mock Studio
Validate JSON documents against JSON Schema constraints (Draft-07), infer schemas from JSON, and generate synthetic mock data.
WebSocket Client & Real-Time Studio
Connect to WebSocket endpoints (WS/WSS), stream real-time JSON frames, configure automated heartbeats, and inspect latency.
Visual RegEx Studio & Tester
Interactive Regular Expression playground with live capture group highlighting, backreference substitution, and 20+ preset patterns.
Visual Diff & Merge Studio
Side-by-side and unified text/code comparison. Character-level diffs, whitespace toggles, and unified patch export.
CSS Gradient & Mesh Studio
Visual multi-stop Linear, Radial, Conic, and organic 4-Orb Mesh gradient generator with 1-click CSS/Tailwind export.
Markdown to PDF & Print Studio
Author markdown documents and export into publication-grade PDF documents with 4 clean print themes.
JSON ⇄ CSV Spreadsheet Studio
Interactive editable spreadsheet table grid. 2-way conversion between JSON and CSV/TSV with search, sort, and cell editing.
CSS Animation & Cubic-Bezier Studio
Visual Bézier curve easing graph editor with live keyframe motion preview stage. Export CSS, Tailwind, and Web Animations JS.
JSONPath & JQ Query Playground
Test and debug JSONPath queries in real time. Extract attributes with recursive descent, filter expressions, and cheat sheet.
HTML, CSS & JS Live Sandbox
Interactive multi-pane web editor with live sandboxed preview, simulated browser console, presets, and 1-click HTML export.
MongoDB & NoSQL Query Studio
Client-side MongoDB query engine. Run find() queries and multi-stage aggregate() pipelines with instant JSON export.
REST API & HTTP Request Studio
In-browser HTTP client to test endpoints, customize headers, edit query params, inspect responses, and copy cURL commands.
CSS Glassmorphism & Shadow Studio
Design frosted glass UI surfaces and multi-layer smooth elevation shadows with live background switchers and Tailwind CSS export.
CSS Flexbox & Grid Visualizer
Visual 2D layout builder with live draggable canvas, flex/grid property toggles, presets, and copyable CSS & Tailwind code.
In-Browser SQLite & SQL Query Studio
100% private in-memory SQL execution engine with sample relational databases, schema explorer, query timer, and CSV/JSON export.
Regex Tester & Real-Time Debugger
Test regular expressions in real time with instant match highlights, capture groups breakdown, flag toggles, and pattern presets.
Code Snippet Card Studio
Generate beautiful syntax-highlighted code screenshot cards with macOS window frames, gradient backdrops, and clipboard PNG export.
Live Markdown Editor & HTML Studio
Split-screen live Markdown previewer with instant HTML export, table helpers, live word counts, and formatting shortcuts.
LLM Token Counter & API Cost Simulator
Interactive BPE tokenizer for GPT-4o, Claude 3.5, Gemini 1.5/2.0, DeepSeek, and Llama 3 with context window cost comparison.
CSS Fluid clamp() Visualizer
Interactive viewport slider to calculate smooth linear-interpolated clamp() formulas for responsive font sizes and spacing scales.
SVG to JSX & Optimizer Studio
Clean XML vector bloat, optimize SVG path precision, and convert to React JSX, Vue 3, Svelte, and Data-URIs with live preview.
OpenGraph & Social Card Simulator
Simulate social sharing cards live for Google Search, Twitter/X, Discord, and LinkedIn with copy-ready HTML header tags.
Text & Code Diff Comparison Studio
Compare two code snippets, config files, or text versions side-by-side with split line-by-line visual change highlights.
Zero-Setup Speed
Everything loads instantly in your browser tab. No npm installs, no container spins, no API keys, and no login walls required.
100% Client-Side Privacy
Your code, SQL queries, database records, and prompts never touch an external server. Everything stays securely inside your device memory.
1-Click Production Exports
Export clean Tailwind CSS classes, standalone HTML bundles, formatted SQL scripts, or copy code snippets directly to your clipboard.