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 GPT-4o, Claude, Gemini and Llama. See cost estimates and context window usage. Free online token counter.
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AI Cost Calculator
Calculate and compare AI API costs across GPT-4o, Claude, Gemini and more. Free online AI cost calculator.
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AI Model Comparison
Compare AI models side by side: context window, pricing, speed and capabilities. GPT-4o, Claude, Gemini, Llama and more.
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System Prompt Builder
Build structured system prompts for GPT, Claude and other AI models. Free online prompt builder with JSON export.
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Context Window Visualizer
Visualize how much of the context window is used by system prompt, history, RAG and response. Free online tool.
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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
Generate an llms.txt file for your website — the standard for making sites readable by AI agents. Free online tool.
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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.