Coding Cost Calc estimates what your coding-agent usage costs at public API list prices. Enter input, output and cache token counts, or drop a local Claude Code JSONL log, and get a per-token-type cost breakdown plus a comparison against Claude Pro/Max/Ultra, ChatGPT Pro (Codex) and Cursor plan prices. No signup, no API key — everything runs in your browser. Prices are dated estimates, not invoices.