CarbonTool

CarbonTool is a carbon accounting platform for organizations that need emissions measurement, sustainability reporting and reduction planning in one place. It is best suited to businesses with formal reporting needs, especially those managing multiple entities or preparing for CSRD. The trade-off is clear: Starter offers only a 30-day Scope 1 and 2 assessment, while full Scope 3 coverage starts with a paid plan.

Overview

CarbonTool combines emissions data collection with reporting across CSRD, VSME, GRI, CDP and ISSB, using a shared data backbone. Teams can keep records for subsidiaries, sites or business units separate, then consolidate them into a group inventory. That structure matters for organizations reporting across entities; a single-entity company may have little use for the consolidation capability.

Reduction targets and scenario planning extend the platform beyond measurement: teams can compare options by impact, cost and return. Data points retain their source, unit, emission factor, quality level and audit trail, giving reviewers a way to trace reported figures back to their inputs.

Key features

Measurement and data collection

More than 200 built-in emission-source templates include methodology, measurement units and emission factors. CarbonTool names DEFRA, EPA, ecoinvent and ADEME as included factor databases. Data can be entered manually, imported from Excel or CSV, submitted through AI uploads, connected by API or brought in through SAF-T. This range suits teams that combine spreadsheets with connected systems; the templates offer a structured starting point for categorizing activity data.

Reporting and reduction planning

The shared data backbone supports five reporting frameworks, while scenario comparisons weigh reduction options by impact, cost and return. These capabilities connect inventory work to both reporting and planning, but the free Starter does not cover Scope 3. All paid plans include full Scope 3 coverage across the 15 GHG Protocol categories, so organizations with full-scope obligations will need a paid tier.

Integration and data residency

Customers can connect systems through an API or MCP; MCP server access is on request. CarbonTool says it is built and hosted in the EU, with emissions data kept on EU infrastructure under EU data protection law. That is a relevant fit for organizations seeking EU data residency.

Pricing

CarbonTool offers a free Starter and three annual paid plans. Starter access lasts 30 days, requires no credit card and does not auto-charge; trial data is retained for 90 days after access lapses. It is a way to assess Scope 1 and 2 measurement, not an ongoing free option or a full Scope 3 solution.

Core is the entry point for ongoing paid use, but single-entity coverage means it is not the fit for teams that need multi-unit consolidation. Pro adds consolidation and VSME reporting; Enterprise adds CSRD reporting and priority support for larger organizations. All paid plans include Scope 3, so Starter gives up the coverage that matters most to organizations tracking all 15 GHG Protocol categories.

Platforms

CarbonTool is available on the web and through an API. API access supports system connections, while MCP server access is available on request.

Who it's for

Choose CarbonTool if your organization needs traceable emissions data, reporting across recognized frameworks and a route from inventory to reduction planning. Core fits a single-entity company; Pro is better suited to SMEs managing several entities or supply chains; Enterprise targets large CSRD-obligated organizations. Look elsewhere if you need a continuing free plan with Scope 3, or if your reporting needs do not justify a paid platform.

Pros and cons

• Pros: Broad data intake, from manual entry and spreadsheets to AI uploads, API connections and SAF-T, gives teams several ways to assemble an inventory.
• Pros: Source, unit, factor, quality level and audit trail stay attached to data points, making reported figures traceable.
• Pros: Multi-entity consolidation, five reporting frameworks and scenario comparisons connect organizational reporting with reduction decisions.
• Cons: Starter is limited to 30 days and Scope 1 and 2, so it cannot serve as a permanent free option or cover full-scope accounting.
• Cons: Multi-unit consolidation is reserved for Pro and Enterprise, making Core a poor match for organizations that need group inventories.
• Cons: MCP access requires a request, rather than being immediately available as a standard integration option.

Alternatives

Carbonfact is worth considering when supplier environmental-data exchange and free LCA verification matter more than CarbonTool’s broad organizational reporting and consolidation focus; its Supplier plan includes supplier-controlled data visibility.

Greenio may suit teams looking for a freemium option with Scope 1, 2 and 3 tracking: its free plan includes unlimited data entry and four PDF reports per year, while CarbonTool’s free Starter is time-limited and covers only Scope 1 and 2.

Persefoni offers a free self-service plan for a single user, with unlimited assets and historical reporting years, so it may suit an individual starting with emissions reporting.

CO2 AI offers an enterprise platform with a 30-day free trial and pricing on request, making it another option for organizations evaluating an enterprise-focused platform.

CarbonInk is a free alternative for Windows and macOS.

50X Impact is a paid web-based alternative.

ACT Group Decarbonization Platform is a paid web-based alternative.

Arbor is a paid web-based alternative.

Browse more options in Carbon Accounting Software.

Verdict

CarbonTool is a strong fit for organizations that need traceable emissions accounting across entities, frameworks and reduction planning, particularly those preparing for CSRD. Its main reason to choose it is the combination of structured data provenance, consolidation and full Scope 3 coverage on paid plans. Look elsewhere if you need a lasting free plan with full-scope tracking or only a simple single-entity inventory.