AI & Agents
LLM Token Counter
Count tokens and estimate cost across GPT, Claude, Gemini, and Llama
SSE Stream Replayer
Parse and replay raw LLM SSE logs from OpenAI, Anthropic, Ollama, and Vercel AI SDK
Prompt Template Tester
Render LLM prompts with variables across Simple, Handlebars, Jinja, and LangChain syntaxes
LLM Output Comparator
Compare 2–4 LLM outputs side by side with diff, metrics, and Markdown / JSON rendering
Function Calling Schema Builder
Design LLM tool schemas visually and export to OpenAI, Anthropic, Zod, and TypeScript
MCP Tool Tester
Connect to MCP servers and test tools via JSON-RPC