PromptFootprint

About

PromptFootprint adds a small overlay to ChatGPT and Claude that estimates the energy, water, and CO₂ behind each conversation, based on how many tokens you send and receive. A full dashboard shows your weekly totals and the savings you earn by trimming prompts.

It's local-first: the estimates are calculated in your browser and stored on your device. Your prompts and the models' replies are never saved or uploaded.

What you get:
- Live energy/water/CO₂ estimates for ChatGPT and Claude, with a clear explanation of what's measured versus estimated.
- An offline spelling, grammar, and clarity checker as you type.
- Optional AI writing help (Google Gemini) that you turn on yourself and route through your own secure proxy.
- A prompt "Energy Saver" that suggests shorter wording and totals the tokens you save.
- Optional accounts to sync your settings and stats across devices — never your prompt text.

Open the dashboard's "How it works" page for the exact method, sources, and limitations. PromptFootprint gives estimates to build intuition, not audited measurements.