Free Claude & MCP Developer Tools
Browser-based tools for Claude Code and MCP development. No sign-in, no API keys, no cost.
Claude Token Counter
Estimate token usage for your CLAUDE.md, system prompt, or any text. See context window usage and cost per model — runs entirely in your browser.
Markdown Validator
Lint your Markdown for broken links, heading hierarchy issues, unclosed code fences, duplicate headings, and style problems. Live preview included.
CLAUDE.md Generator
Generate a CLAUDE.md configuration file for your project. Choose your framework, language, and tooling — get a ready-to-use file instantly. No AI, no API key.
Cursor → CLAUDE.md Converter
Migrating from Cursor AI to Claude Code? Paste your .cursorrules file and get a CLAUDE.md equivalent instantly. Free, browser-based converter.
MCP Config Builder
Generate a claude_desktop_config.json snippet for Claude Desktop. Pick MCP servers from the catalog, fill in your credentials, and copy.
MCP README Generator
Generate a professional README.md for your MCP server. Fill in tools, env vars, and installation steps — get a complete, formatted README instantly.
Slash Command Generator
Build custom Claude Code slash commands. Fill in the name and instructions — generates a .claude/commands/ file ready to drop into your project.
.gitignore Generator
Select your stack and get a clean, combined .gitignore in seconds. Supports Node.js, Python, Go, Rust, Docker, macOS, Windows, and more.
JSON → TypeScript
Paste any JSON object and get fully typed TypeScript interfaces instantly. Handles nested objects, arrays, optional fields, and union types.
Claude Model Comparison
Compare Claude Haiku 4.5, Sonnet 4.6, and Opus 4.6 side by side. Pricing, context windows, speed, and use cases to help you pick the right model.
System Prompt Builder
Build a structured system prompt for Claude. Set the role, tone, task focus, output format, and constraints — get a ready-to-paste prompt for Claude API or Claude.ai.
Prompt Token Optimizer
Paste any Claude prompt and instantly see token count, API cost across models, and an optimized version with filler phrases removed. Reduce costs without losing clarity.
Claude API Cost Calculator
Estimate your monthly Anthropic API bill. Enter token usage and request volume — get a cost breakdown across Haiku, Sonnet, and Opus with live comparison.
JSON Formatter & Minifier
Format JSON with proper indentation, minify to a single line, or validate syntax. Side-by-side editor with size stats. No data sent to any server.
Regex Tester
Test and debug regular expressions in real time. Matches are highlighted as you type, with a full match list showing index positions and capture groups. Free, browser-based.
All tools run entirely in your browser — no data is sent to any server.