WTClaude is a free, open-source cost tracker for Claude Code.

Most trackers read your session logs — which were never the billing source — so their totals drift from your bill. WTClaude reads the statusline instead (the same source behind your bill), so your today / week / month cost is billing-grade in the terminal. Run `wtclaude compare` to see your real number next to a log-based estimate, and the gap.

It also forecasts the June 15 billing split and tracks Claude Fable 5's June 23 cost cliff — both clearly labeled as estimates. Free, MIT, local-first, independent (not affiliated with Anthropic).

npx wtclaude setup