AI & LLM tools

Free tools for working with large language models — estimate token counts for GPT, Claude, and Gemini, check whether a prompt fits the context window, and sanity-check API input cost. Everything runs in your browser and nothing you paste is uploaded.

token counter

Free token counter for GPT, Claude, and Gemini. Paste text to estimate tokens, characters, and words, plus context-window fit and indicative API input cost.