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SPECIFICTION
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CarbonInk

carbonink.xyz

Free plan WindowsmacOS
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Spec score 7.5 #17 of 30 in Carbon Accounting Software

What it is

CarbonInk is a free, open-source desktop tool for greenhouse-gas accounting on macOS and Windows. It runs offline, and its README says user data does not leave the device. The inventory tracks emission sources, activity data, and pinned emission factors across Scope 1, 2, and 3. AI can extract activity data from utility bills, fuel receipts, freight, travel, and purchase documents when users provide their own LLM API key. Users can fill customer or rating-agency disclosure forms from the inventory and collect supplier data for Scope 3 Category 1. The app produces 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, with 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 needed.

Spec sheet

Purpose
CarbonInk is a free, open-source desktop tool for greenhouse-gas accounting.Read 8 Oct 2026 · github.com
Integrations
A built-in MCP server exposes inventory data to Claude, Cursor, and Pi.Read 8 Oct 2026 · github.com
License
CarbonInk is licensed under the MIT License.Read 8 Oct 2026 · github.com
AI extraction
AI can extract activity data from utility bills, fuel receipts, freight, travel, and purchase documents using the user's own LLM API key.Read 8 Oct 2026 · github.com
Audit trail
The inventory includes pinned emission factors and audit-grade calculation snapshots.Read 8 Oct 2026 · github.com
Disclosure workflows
Users can fill customer or rating-agency disclosure forms from their inventory and collect supplier Scope 3 Category 1 data.Read 8 Oct 2026 · github.com
Download
The README directs users to the releases page for macOS and Windows builds and says no activation key is required.Read 8 Oct 2026 · github.com
Inventory
It tracks emission sources, activity data, and pinned emission factors for Scope 1, 2, and 3.Read 8 Oct 2026 · github.com
Offline use
The app runs fully offline, and its README says user data never leaves the device.Read 8 Oct 2026 · github.com
Reporting
The app produces a one-click ISO 14064-1 inventory report in PDF format.Read 8 Oct 2026 · github.com

Plans and prices

Free Free No account · no cloud · no subscription Read 8 Oct 2026 · github.com

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Strong points and limits

Strong points

  • Works offline on macOS and Windows
  • Tracks Scope 1, 2, and 3 emissions
  • Creates ISO 14064-1 PDF reports
  • Includes pinned factors and calculation snapshots

Limits

  • AI extraction requires your own LLM API key
  • Available builds are for macOS and Windows

Who it suits

CarbonInk suits organizations or individuals tracking emissions across Scope 1, 2, and 3 who want an offline desktop workflow. AI extraction requires the user's own LLM API key.

Verdict

CarbonInk combines offline emissions tracking, disclosure workflows, and reporting in an MIT-licensed desktop app. Its AI extraction depends on providing an LLM API key.

Where Specifiction places it

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