AI Tools
AI tools: token counter, LLM cost calculator, context window, prompt formatter and llms.txt - all client-side, no API key.
Token Counter
Estimate the token count of any text for LLMs such as GPT or Claude — useful for context window planning and API cost estimation, free online.
LLM Cost Calculator
Calculate API cost for a language model from input/output tokens.
Context Window Calculator
See how much of a model context window a token count uses.
Prompt Formatter
Fill prompt templates that use {{variable}} placeholders online — define variables, paste your template and copy the finished prompt instantly, free.
llms.txt Checker
Check an llms.txt against the common structure (title, summary, sections, links).