carbon-llm, AI CO₂e estimator by Clem

Estimate ChatGPT & LLM CO₂e per reply (Claude, Gemini, Mistral, Grok). No account needed. Private metadata-only.Estimates CO₂e per AI reply on ChatGPT, Claude, Gemini, Mistral & Grok: sidebar/panel shows grams CO₂e using token metadata

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About this extension

arbon-llm adds an in-page panel and toolbar popup that estimate the greenhouse gas footprint (CO₂e in grams) of each exchange with major LLM chat UIs.
Supported surfaces include ChatGPT, Claude, Gemini, Mistral Chat, and Grok. The extension reads token or usage signals exposed by the page where possible, and can fall back to lightweight DOM heuristics.
When it contacts carbon-llm.com, it sends only technical metadata such as model id and token or usage counts needed to compute CO₂e—not the text of your prompts or model answers. No Carbon account is required to use the extension.
You can resize or hide the panel; a keyboard shortcut (Alt+Shift+C by default) toggles a compact “pill” view. Options are available from the extension’s options page.
Privacy policy: https://carbon-llm.com/legal/privacy

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Permissions and data

Required permissions:

Access your data for chatgpt.com
Access your data for chat.openai.com
Access your data for claude.ai
Access your data for gemini.google.com
Access your data for bard.google.com
Access your data for chat.mistral.ai
Access your data for grok.com
Access your data for www.grok.com
Access your data for carbon-llm.com
Access your data for localhost:3000

Optional permissions:

Access your data for sites in the anthropic.com domain
Access your data for sites in the googleapis.com domain
Access your data for sites in the mistral.ai domain
Access your data for chatgpt.com
Access your data for chat.openai.com
Access your data for claude.ai
Access your data for gemini.google.com
Access your data for bard.google.com
Access your data for chat.mistral.ai
Access your data for grok.com
Access your data for www.grok.com
Access your data for carbon-llm.com
Access your data for 127.0.0.1
Access your data for localhost
Access your data for localhost:3000

Data collection:

The developer says this extension doesn't require data collection.