Before you start
Which AI do you use?
Every module uses its prices and its rules. You can switch later at the top of the page.
Module 1
Where the money goes
Every time you send a message, Claude reads the whole chat again from the top. Set up a chat, press play, and watch the pile of old messages grow.
What each message cost
Re-reading the setup and old messagesYour new message and Claude's answer
Show the maths
Module 2
The Caveman myth
"Tell Claude to answer like a caveman and save tokens." Shrink every answer and watch what the bill does.
Show the maths
Same chat and maths as module 1. Only Claude's answers shrink, and so does the small part of history they make up.
Module 3
Screenshot tax
Check with Claude
Uses your own Anthropic API key. The cropped image goes from your browser to Anthropic, not to us.
Show the maths
Drag the corners to crop. Drag inside to move. Paste or drop any image.
Module 4
Format tax
Every bracket, quote and indent is something Claude has to read. The coral marks show what you pay for that isn't words. Convert and watch them vanish.
Check with Claude
Uses your own Anthropic API key. Both texts go from your browser to Anthropic, not to us.
Show the maths
Converted in your browser. Token estimate: characters ÷ 3.5. Marked characters are punctuation, brackets, quotes and indentation.
Module 5
The restart fee
Think of a shop that keeps your usual order ready. Come back soon with the same order and it's quick and cheap. Change the order, or stay away too long, and they start from scratch and charge for all of it.
Show the maths
Module 6
Pick the model
The same job on three models. Most everyday jobs don't need the biggest one.
Show the maths
Your sessions
Load your own history
See modules 1 to 6 with your own numbers. Your files are read in this browser tab. Nothing is uploaded.
Best on a laptop: you'll need the file from your email or terminal.
Claude app
- In Claude, open Settings › Privacy › Export data.
- Open the email from Anthropic. The link works for 24 hours.
- Drop the zip here.
Claude Code
- In a terminal, run
npx 100x-token-meter. It runs offline, and also reads Hermes Agent, including open models on OpenRouter or Ollama. - It writes
token-meter.json: totals by tool, MCP server and skill. No prompts or code. - Drop that file here.