AI Tools
Free AI developer tools — token counter, cost calculator, model comparison and more.
8 tools available
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Token Counter
Count tokens for ChatGPT, Claude and Gemini models. Exact OpenAI counts, cost per request and context window usage. Free, runs in your browser.
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AI Cost Calculator
Estimate and compare monthly API costs for ChatGPT, Claude, Gemini, DeepSeek and more, from official per-token prices. Free online calculator.
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AI Model Comparison
Compare ChatGPT, Claude, Gemini, DeepSeek and Llama models side by side: context window, price per 1M tokens and image input. Free.
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System Prompt Builder
Build a structured system prompt for ChatGPT, Claude or Gemini: role, context, instructions, format and constraints, as Markdown or XML tags. Free.
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Context Window Visualizer
See how much of an LLM context window your system prompt, history, RAG context and response use. Type token counts or paste text. Free.
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Prompt to cURL
Convert your prompt into ready-to-run cURL, Python or Node.js code for OpenAI, Anthropic and Google APIs. Free online tool.
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llms.txt Generator
Create or validate an llms.txt file for your website in the llmstxt.org format: summary, sections and links for AI agents. Free, in your browser.
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JSONL Validator
Validate and inspect JSONL files for AI fine-tuning datasets. Free online JSONL validator for OpenAI, Anthropic and Mistral formats.