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Best Carbon Accounting Software in 2026
Carbon accounting software is for organizing emissions information and supporting related accounting work. Compared on data collection, emissions factors, and scope coverage, the entries can be assessed against the information your process needs to manage. Audit trail and API access offer further points to examine, as do supplier engagement, free-plan availability, and paid-from pricing. Carbonfact, CarbonTool, and Greenio are among the named options. Consider whether supplier engagement or API access is important for your workflow, then compare each option’s stated coverage and access details against those needs.
- 30 apps
- Research read 23 Sept 2026
- How the order is worked out
- 1
ACT Group Decarbonization Platform
Free plan WebConsider ACT Group Decarbonization Platform if your organization needs connected emissions accounting, supplier engagement, and renewable energy procurement.
- 2
CarbonInk
Free plan MacWindowsChoose CarbonInk if you need a free, offline greenhouse-gas accounting tool with Scope 1–3 inventory tracking, disclosure workflows, and PDF reporting.
- 3
CarbonTool
Free plan APIWebCarbonTool combines emissions data collection, framework reporting, entity consolidation, and reduction planning.
- 4
CO2 AI
Free plan APIWebCO2 AI brings emissions measurement, reduction planning, supplier engagement, and reporting into one enterprise platform. Organizations can request pricing and try a plan free for 30 days.
- 5
Greenio
Free plan APIWebGreenio combines emissions tracking with reporting aimed at Indian companies and offers several plan levels.
- 6
EcoReko
Free plan WebEcoReko combines emissions tracking, reporting and reduction-project modelling for SMEs. Check plan limits and the in-development status of supplier engagement and CBAM features against your needs.
- 7
Hedgehog Carbon Platform
Free plan WebHedgehog Carbon Platform combines emissions accounting, reporting support, and team workspaces with AI guidance and human expertise.
- 8
Persefoni
Free plan APIWebPersefoni combines emissions accounting coverage with guided disclosure tools and anomaly detection.
- 9
Vaayu
Free plan APIWebVaayu combines company footprint tracking, product assessments, and reduction planning for retail and other businesses. Check plan scope and availability, and request pricing for paid access.
- 10
BigMile
Free trial APIWebPick BigMile for multimodal transport emissions work that combines data imports, scenario analysis, dashboards, and audit-ready reporting.
- 11
CarbonAnalytics
Free trial APIWebCarbonAnalytics brings emissions tracking, reporting frameworks, supplier-related plan limits, and integrations into one platform.
- 12
GreenStitch
Free trial APIWebGreenStitch brings carbon, ESG, product, supplier and decarbonisation work into one platform.
- 13
NetNada
Free trial APISelf-hostedWebNetNada combines emissions accounting, report generation, and data upload options for business sustainability work.
- 14
Arbor
Paid APIWebChoose Arbor if your company needs product carbon footprints alongside emissions measurement for assets or organizational activity.
5.7 Visit site - 15
CarbonSmart
Paid APISelf-hostedWebChoose CarbonSmart if your organization needs corporate and product carbon accounting, CBAM workflows, or standards-based LCA support.
- 16
CarbonChain
Paid APIWebCarbonChain combines emissions measurement, supplier analysis, and disclosure workflows for commodity-related organizations.
- 17
Carbonfact
Paid APIWebCarbonfact combines fashion-focused emissions data, product assessment, reporting, and reduction planning.
- 18
Carbon Accounting AI
Paid WebCarbon Accounting AI provides spend-led emissions classification with evidence, review controls and reporting packs.
- 19
Carbonstop Ccloud
Paid Self-hostedWebConsider Carbonstop Ccloud if your organization needs emissions management across scope 1–3, supplier engagement and an audit trail.
- 20
50X Impact
Paid WebChoose 50X Impact if your organization needs web-based emissions tracking across all three scopes with supplier engagement and an audit trail.
- 21
TrackZero
Free trial WebTrackZero brings emissions tracking, reduction planning and reporting together, with plans for different organisation sizes and a separate bespoke option.
- 22
ClimateTracker
Paid WebClimateTracker combines disclosure preparation, sustainability analysis, records, and collaboration in an organisation-wide web platform.
- 23
Plan A
Paid APIWebPlan A combines emissions measurement and reporting with target-setting and reduction planning for businesses. Buyers should note that pricing is on request and CSRD reporting is an add-on.
- 24
Karbon360
Paid WebKarbon360 combines data collection, emissions calculations, traceability, and reporting for companies in its target region.
- 25
Normative
Paid WebNormative combines emissions accounting, reporting, and reduction support with tools for supplier and product-level work. Pricing is not published, so prospective customers need to request it.
#1Places #1, #2, #3, #4, #5 on this list can be bought by the makers of the software on it. See the price
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