The Lab
Interactive LLM-powered tools. Bring your own API key — everything runs in your browser, nothing is stored on a server.
Prompt Playground
Test prompts against Claude and GPT side-by-side. Adjust temperature, max tokens, and system prompt. Compare outputs instantly.
System Prompt Architect
Interactive builder for AI system prompts. Define role, constraints, output format, and few-shot examples. Export as JSON or plain text.
MCP Explorer
Paste an MCP server manifest and get a visual map of all tools, resources, and prompts. Understand any MCP server at a glance.
Skill Sentinel
Security auditor for AI skill files. Scans for 25+ vulnerability patterns, scores your skill, and uses Claude to generate a hardened version.
PRIVACY_NOTE
API keys are stored only in your browser's localStorage and sent directly to the provider (Anthropic/OpenAI). This site never proxies or logs your keys or prompts.