Free, fast, privacy-friendly tools for developers. No signup required.
Compare AI models: pricing, context windows, benchmarks, and specs side by side
Format, validate, and beautify JSON with syntax highlighting
Curated directory of Model Context Protocol servers with install commands and categories
Interactive CSS Flexbox and Grid playground with live visual preview and code output
Generate strong, cryptographically secure passwords with customizable length, character sets, and entropy meter
Generate QR codes from text, URLs, WiFi credentials, and more — download as SVG or PNG
Compare AI agent frameworks: LangChain, CrewAI, AutoGen, Mastra, and more side by side
Test regular expressions with real-time matching and explanation
Convert vanilla CSS to Tailwind CSS utility classes with property mapping and spacing scale conversion
Convert HTML to JSX with automatic attribute renaming, style objects, self-closing tags, and comment conversion
Compare AI API costs across providers for your specific workload
Visual CSS box-shadow generator with multiple layers, live preview, presets, and instant CSS copy
Estimate token counts and costs across GPT-4o, Claude, Gemini, Llama, and more
Convert colors between HEX, RGB, HSL, HSV, CMYK, and Tailwind CSS with contrast checker
Validate Docker Compose YAML with structural checks, dependency validation, and common mistake detection
Paste an OpenAPI or Swagger spec and see interactive API documentation instantly
Decode and inspect JSON Web Tokens — header, payload, claims, and expiration
Visual cron expression builder with human-readable descriptions and next execution times
Generate favicons from text or emoji in all standard sizes with HTML and PWA manifest snippets
Interactive SVG path editor with visual canvas, operations, and command reference
Generate custom placeholder images with configurable dimensions, colors, and text — download as PNG
Curated collection of system prompts for coding, writing, analysis, and more
Compare outputs from different AI models side-by-side with diff highlighting
Compare two texts side-by-side with highlighted additions, deletions, and changes
Format, beautify, and minify SQL queries with keyword capitalization
Generate JSON Schema from examples — essential for function calling and structured output
Build AI prompt templates with variables, live preview, and export to JSON/YAML
Estimate total AI API costs for real-world workloads across all major providers
Generate SEO meta tags with live Google, Facebook, and Twitter card previews
Interactive searchable reference for all HTTP status codes with descriptions and use cases
Live Markdown preview with GitHub Flavored Markdown support
Convert between YAML and JSON formats with validation and configurable formatting
Convert between CSV and JSON with auto-delimiter detection and proper escaping
Encode and decode Base64 strings and files
Generate UUID v4 and v7 with bulk generation support
Convert between Unix timestamps and human-readable dates
Encode and decode URL components and full URLs
Minify or beautify JavaScript code with compression ratio stats
Encode and decode HTML entities and special characters
Visual Unix file permission calculator with octal, symbolic, and ls -la format conversion
Generate MD5, SHA-1, SHA-256, SHA-512 hashes
Generate placeholder text in various formats
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