Cost Calculator
LLM API Cost Calculator
Price any workload across providers with a live per-model rate table.
Live pricingOpen tool
Tools
Developer tools for building with LLMs and agents
Fast, free, no-signup utilities for the day-to-day of shipping AI-powered products: price a workload across providers, count tokens with the real tokenizers, convert tool schemas between APIs, and generate protocol configs. Every tool ships with a citable reference table.
12 toolsPricing updated No signup
Cost & Tokens
Token Counter
Token Counter
Count tokens with each model's real tokenizer and estimate cost as you type.
Live pricingOpen tool
Agent Cost
AI Agent Cost & Latency Calculator
Estimate the token cost and latency of a multi-step agent run.
Live pricingOpen tool
RAG Cost
RAG Cost & Vector Storage Calculator
Size embedding cost and vector storage for a RAG corpus.
Live pricingOpen tool
Models & Limits
Context Windows
LLM Context Window Comparison
Compare model context windows and check if your input fits.
Live pricingOpen tool
Model Chooser
Which LLM Should I Use?
Filter models by price, context, and use case to pick the right LLM.
Live pricingOpen tool
Rate Limits
LLM Rate Limit & Throughput Calculator
Find your binding rate limit and max sustainable throughput.
InstantOpen tool
Interop
Schema Converter
Tool / Function Schema Converter
Convert a tool definition between OpenAI, Anthropic, and Gemini formats.
InstantOpen tool
JSON Schema
Structured Output JSON-Schema Validator
Check a JSON Schema against each provider's structured-output rules.
InstantOpen tool
Protocol
MCP Config
MCP Server Config Generator & Validator
Generate or validate an MCP server config for Claude Desktop and other hosts.
InstantOpen tool
llms.txt
llms.txt Generator
Build a spec-compliant llms.txt file from a short form and download it.
InstantOpen tool
AI & Crawlers
AI Crawlers
AI Crawler Control Generator
Allow or block AI crawlers with a ready-to-paste robots.txt block.
InstantOpen tool
The main event
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