The Developer Toolkit Built for the AI Era
Essential tools for AI developers — count tokens, compare model pricing, build MCP manifests, craft prompts, and more. All free, all in your browser.
All Tools
AI Token Counter
Count tokens for GPT-4o, Claude, Llama, Gemini, and more. See costs instantly.
AI Model Pricing Calculator
Compare costs across 30+ AI models. Estimate your monthly spend instantly.
MCP Manifest Generator
Build MCP server manifests visually. Add tools, resources, and prompts with a form-based editor.
OpenAPI to MCP Converter
Convert any OpenAPI specification into MCP tool definitions automatically.
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JSON Schema Builder
Build JSON schemas visually for LLM structured outputs, function calling, and API validation.
Prompt Diff & Version Compare
Compare two prompt versions side-by-side. See exactly what changed with token counts.
Prompt Template Library
Curated collection of system prompt templates for coding, writing, analysis, and more.
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Featured AI Tools
View All AI ToolsLangChain
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LlamaIndex
47kData framework for building LLM applications over custom data. Specializes in RAG pipelines and data connectors.
AutoGen
55kMicrosoft's framework for building multi-agent conversational systems. Agents collaborate, debate, and solve tasks together.
Model Context Protocol
38kThe official MCP specification and SDKs by Anthropic. Open standard for connecting AI models to external tools and data.
Aider
41kAI pair programming in your terminal. Works with any LLM to edit code in your local git repo with automatic commits.
Hugging Face Transformers
156kThe most popular library for working with pre-trained models. Download, fine-tune, and deploy thousands of models.