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13 free tools · 100% in your browser

The LLM Toolbox
for builders & AI engineers

Count tokens, price requests across models, size RAG chunks and context windows, build prompts, schemas and message payloads, improve prompts, write MCP server configs and plan your AI tool spend, instantly, in your browser.

13 toolsEditable price tableNo signup

Pick a tool

Prices are indicative and dated July 2026, every calculator lets you type your own rates.

Every tool on its own page

All 13 tools of the LLM / AI Toolbox, each with how to use it, a worked example and answers to common questions.

Token CounterLLM Cost CalculatorModel Price CompareEmbedding Cost CalculatorRAG Chunk CalculatorContext Window CalculatorPrompt TemplaterTemperature ExplainerChat to API JSONTool Schema BuilderPrompt ImproverMCP Config BuilderAI Tool Cost Planner
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FAQ

Questions, answered

Are the LLM Toolbox tools free to use?
Yes. Every tool here is free, private, and runs entirely in your browser, with no signup and nothing uploaded to a server.
How current are the LLM cost estimates?
The cost calculator ships with editable model prices you can update, so you can estimate token costs and compare models for your own budget.
Do I need an account or to install anything?
No account and no install. Open the page and start using it. The tools keep working even offline once the page has loaded.
How does CareerByteCode help my career beyond these tools?
Join the community for mentorship, grow your personal brand, and freelance under the CareerByteCode brand with a 55% to 80% revenue share. Join the community.

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