# AI Usage and Token Log Explorer

Upload a CSV or JSONL usage log to see token use and estimated cost by model and task, plus retries and the biggest requests.

- URL: https://toolstackhub.co.uk/tools/ai-usage-log-explorer/
- Category: Developer Tools
- Price: free, no sign-up
- Privacy: runs in the browser; input is not uploaded
- Last updated: 2026-10-08

## About
Open a usage log with one request per row (CSV, or JSON lines as many AI APIs produce) and the explorer finds the columns for model, input and output tokens, optional task label and status, then totals tokens and an estimated cost, ranks the most expensive tasks and highlights retries and failures. Enter your own prices per million tokens because they differ by model and change often. The file is processed in your browser and is never uploaded.

## How to use
1. Choose your file using the file picker above. It stays on your device.
2. Adjust any options that appear.
3. Download the finished file.

## FAQ
**Which log formats work?** CSV, JSON lines or a JSON array with token counts per request. It looks for columns like input_tokens and output_tokens, or prompt_tokens and completion_tokens, and for model, task and status when present.

**How is cost estimated?** From the per-million-token prices you enter, which can be overridden per model. If your file already has a cost column, that is used instead.

**Is the AI Usage and Token Log Explorer free?** Yes, with no sign-up or limits.