Free AI tools
Small, focused utilities for people building with language models. Everything runs in your browser, nothing you type is uploaded, and each tool links back to the stage of the course that explains it.
AI Token Counter
Paste any text to see exactly how a language model will split it into tokens — the units that decide what you pay and how much of the context window is left. The counter runs entirely in your browser.
LLM API Cost Calculator
Turn a token count and a traffic guess into a real monthly bill. Set the prompt size, the answer size and how many requests you expect, and every priced model is compared side by side.
Runs entirely in your browser — nothing you type leaves the page.