CarbonInk

CarbonInk is a free, open-source desktop tool for greenhouse-gas accounting on macOS and Windows. It runs fully offline, and its README says user data never leaves the device. The inventory tracks emission sources, activity data, and pinned emission factors across Scope 1, 2, and 3. For data collection, AI can extract activity details from utility bills, fuel receipts, freight, travel, and purchase documents when connected with the user's own LLM API key. Users can fill customer or rating-agency disclosure forms from their inventory and collect supplier Scope 3 Category 1 data. The app creates an ISO 14064-1 inventory report as a PDF in one click. Pinned factors and calculation snapshots form an audit trail. A built-in MCP server exposes inventory data to Claude, Cursor, and Pi. CarbonInk is licensed under MIT. Its Free plan costs nothing and requires no account, cloud service, or subscription. The README directs users to the releases page for macOS and Windows builds and says no activation key is required.

CarbonInk combines offline emissions tracking, disclosure workflows, and PDF reporting in a free desktop tool. Its AI extraction depends on a user-provided LLM API key.

CarbonInk suits people who need to track greenhouse-gas emissions across Scopes 1–3 and produce an inventory report. It may also fit users who want an offline workflow and can provide their own LLM API key for document extraction.