Free tools
Small tools for serious GenAI work.
Useful calculators built from the engineering decisions behind RAG, agents, and production LLM applications. No sign-up and no data leaves your browser.
Available now
04 toolsModel economics
LLM API Cost Calculator
Compare OpenAI, Claude, and Gemini spend from request volume, input, output, and cached tokens.
9 current modelsCache pricingCost comparisonOpen
Student survival
Can I Bunk Today?
Calculate attendance, classes needed to recover, and exactly how many you can safely miss.
75% calculatorSafe bunksFunny verdictsOpen
Tokenization
Prompt Token Counter
Count tokens locally with real o200k, cl100k, and p50k tokenizers.
Exact encodingContext usageLocal processingOpen
RAG engineering
RAG Chunking Calculator
Estimate chunks, overlap duplication, retrieval context, and raw vector storage.
Token estimateVector storageRetrieval budgetOpen
Purpose-built
Each tool answers a real engineering question—not a generic AI wrapper.
Local by default
Calculator inputs stay in your browser. No documents or project data are uploaded.
Production-minded
Results include the trade-offs and caveats that quick demos usually ignore.