Ship agents with
a full toolbox.
Cost the models, size the prompts, wire the servers, pick the framework. Free tools for people building AI agents — everything runs in your browser, nothing gets sent anywhere.
LLM API cost calculator
What does this agent cost per month? Compare Claude, GPT, and Gemini pricing side by side, caching discounts included.
Open the calculatorFree model directory
Every $0-per-token model across 7 providers, synced daily — with one-click config for Claude Code and Codex.
MeasureToken estimator
Size a prompt before you send it. Live counts for Claude, GPT, and Gemini tokenizers, CJK included.
AuthorSystem prompt builder
Turn a role, a task, and a few rules into a clean, structured system prompt. Copy it in one click.
WireMCP config writer
Add servers once, export valid JSON for Claude Code, Cursor, and VS Code — shapes handled for you.
CompareFramework field guide
LangGraph, CrewAI, OpenAI Agents SDK, Claude Agent SDK, AutoGen — what each is actually good at.