CarbonInk
CarbonInk: A free, offline Scope 1–3 accounting tool for technical teams that value control. Ranked #24 of 30 in Carbon Accounting Software by our editors (6.9/10); pricing: Free plan; best for technical users wanting free open-source accounting.
At a glance
- Editor score6.9 / 10
- PricingFree plan
- Best forTechnical users wanting free open-source accounting
- Free planYes
- Paid fromFree
- Scope coverageScope 1-3
- Facts checked22 Sep 2026
Where it wins
- Covers Scope 1, 2, and 3 inventory management
- AI extracts activity data from bills, receipts, and other documents
- Creates ISO 14064-1 reports with pinned factors and calculation snapshots
Where it doesn't
- Integrations are limited to Claude, Cursor, and Pi
- Desktop coverage is limited to Windows and macOS
- Local operation may not suit teams needing cloud collaboration
Our verdict on CarbonInk
CarbonInk is a free, open-source desktop application for greenhouse-gas accounting. It is aimed at technical users who want to manage Scope 1, 2, and 3 emissions locally, without an account, cloud service, or subscription. The application imports utility bills, fuel receipts, freight, travel, and purchase documents, then uses AI to extract activity data. It also tracks emission sources, activity data, and factors across an inventory.
Its strongest area is the combination of accounting control and reporting depth. Users can pin emission factors and preserve calculation snapshots, creating a clearer record of how inventory figures were produced. CarbonInk also supports supplier Scope 3 Category 1 data collection, disclosure questionnaire completion, and PDF generation for an ISO 14064-1 inventory report. The built-in MCP server connects inventory data with Claude, Cursor, and Pi, which fits teams already working with those tools.
CarbonInk’s local and offline design is a clear fit for organizations that prefer desktop software and direct control over accounting data. It is less suitable for teams that depend on broad third-party integrations, browser-based collaboration, or a shared cloud workspace. The product runs on Windows and macOS, so platform requirements also matter. Choose CarbonInk when free open-source software, offline operation, automated document extraction, and detailed Scope 1–3 workflows are priorities; choose an alternative when a wider ecosystem or cloud-first teamwork is more important.
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CarbonInk pricing
CarbonInk fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Free |
| Scope coverage | Scope 1-3 |
| Data collection | Automated |
| Emissions factors | Not verified |
| Supplier engagement | Yes |
| Audit trail | Yes |
| API access | Not verified |
| Deployment | Desktop |
| Platforms | Windows, macOS |
| Built for | Solo, Small business (editorial estimate) |
| Integrations | 3 integrations: Claude, Cursor, Pi |
| Pricing | Free plan |
| Website | carbonink.xyz |
| Facts checked | 22 Sep 2026 |
CarbonInk integrations
CarbonInk lists 3 integrations on its own site.
- Claude
- Cursor
- Pi
Alternatives to CarbonInk
- IBM EnviziA broad Scope 1–3 platform for organizations with complex sustainability data needs.9.4
- ACT Group Decarbonization PlatformAn end-to-end platform for carbon accounting, supplier programs and renewable-energy procurement.9.3
- CarbonToolBroad Scope 1–3 accounting and reporting from €2,000 per organization annually.9.2
See all CarbonInk alternatives →
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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