9 Best carbon accounting software: top tools compared [2026]

Why carbon accounting software matters

Research shows that the global carbon accounting software market is projected to grow from USD 27.51 billion in 2026 to USD 136.44 billion by 2034. While regulatory pressure is the biggest driver, many forward-thinking brands see sustainability as a responsibility.

Why does carbon accounting software really matter?

Carbon accounting software helps companies measure, manage, and report their greenhouse gas emissions. But the gap between tools that simply track emissions and tools that help you act on them is significant.

Most organisations start with a spreadsheet. It works for a while. Then the data gets complex, the board starts asking questions, and CSRD deadlines move from distant to immediate. At that point, a structured platform becomes essential.

The right carbon accounting software does more than produce a number. It gives your sustainability team a reliable data foundation, gives your finance team decision-grade insights, and gives your leadership team the confidence to answer tough questions about your climate performance.

Why listen to us?

At Emission Twin, we work with sustainability managers, CFOs, and leadership teams, helping them navigate real climate reporting challenges. The platforms compared in this guide are ones our clients have evaluated, switched from, or chosen alongside us. We have also reviewed each tool against the criteria that matter most to climate-focused teams: Scope 3 visibility, CSRD readiness, audit traceability, and the ability to move from reporting to actual reduction planning.

What to look for in carbon accounting tools

Not every platform suits every organisation. Before comparing tools, it helps to know which features actually matter for carbon accounting work. Core features worth evaluating include:

Scope 1, 2, and 3 coverage

Scope 1 and 2 emissions are relatively straightforward to measure. Scope 3, which covers your entire value chain, including purchased goods, business travel, and supply chain emissions, is where most companies struggle. Look for platforms that handle Scope 3 with structure, traceability, and supplier-engagement capabilities.

Emissions factor management

Accurate carbon accounting depends on using the right emissions factors. Strong platforms auto-suggest factors, show their source, and maintain an auditable record of which factors were applied to which calculations.

Audit readiness and data traceability

Your emissions data needs to hold up under external review. Look for version history, source references, and full transparency in the calculation from input to output.

Framework and standard alignment

Common frameworks include the GHG Protocol (including the Land Sector and Removals Guidance), CSRD, SBTi, TCFD, and ESRS. Check that the platform supports the standards your organisation currently reports against and those you expect to report against in the future.

Reduction planning and scenario modelling

Measuring emissions is only the first step. The strongest platforms let you model different reduction strategies, compare their projected impact, and build an executable roadmap. This is where most tools fall short.

Onboarding speed and ongoing support

Complex implementation delays value. A platform your team can start using on day one is worth more than one that takes months to configure.

The best carbon accounting software: expert picks

Tool	Best for	Carbon Depth (Scopes)	Reduction Planning	Key Strengths	Limitations
Emission Twin	Companies that need both tracking and actionable reduction planning	High (Scopes 1-3)	Full scenario simulation	Digital twin modelling, CSRD compliance, full traceability	Focused on environmental reporting; Nordic-centric
Greenly	SMEs starting carbon tracking	Medium (Scopes 1–3)	Reporting only	Affordable, automated setup, SME-friendly	Limited Scope 3 depth, no scenario modelling
Workiva	Enterprises managing ESG + financial disclosure	Medium (Scopes 1–3)	Reporting only	Multi-framework support (GRI, SASB, CSRD), robust auditing	No reduction modelling, enterprise pricing only
Microsoft Sustainability Cloud	Organisations using Microsoft 365/Dynamics	Medium (Scopes 1–3)	Reporting only	Deep integration with the Microsoft ecosystem, Power BI ready	Limited depth for advanced Scope 3 and CSRD workflows
Normative	Mid-market firms building first carbon baseline	Medium (Scopes 1–3)	Reporting only	Strong GHG Protocol alignment, clear carbon baseline setup	Lacks advanced planning and CSRD workflows
Sweep	Mid-market firms managing supplier data	Medium (Scopes 1–3)	Limited	Scope 3 supplier engagement, user-friendly interface	Minimal simulation tools, limited for complex CSRD
Plan A	EU mid-market firms building structured carbon + ESG programmes	High (Scopes 1–3)	Basic tracking	CSRD and GRI aligned, strong EU fit, easy onboarding	No scenario simulation, limited analytics
Persefoni	Corporations & financial institutions	High (Scopes 1–3)	Reporting only	PCAF + TCFD alignment, complex org structure support	Limited reduction tools, less EU focus
Watershed	Large enterprises with complex carbon programmes	High (Scopes 1–3)	Partial	Enterprise-scale accounting, supply chain management	Over-engineered for mid-size, limited EU specificity
Agentforce Net Zero	Salesforce users integrating sustainability data	High (Scopes 1–3)	Reporting only	Seamless CRM integration, value-chain visibility	Basic carbon modelling, no simulation or CSRD workflows

1. Emission Twin

Best for: Teams that need to track emissions and build a reduction plan

Emission Twin is the best carbon accounting software for sustainable brands. It’s built specifically for corporate climate and sustainability management. Emission Twin stands out because it goes beyond most carbon accounting tools by combining full Scope 1, 2, and 3 tracking with built-in reduction-scenario modelling. It also features structured CSRD compliance workflows.

Where most carbon accounting platforms stop at measurement, Emission Twin keeps going. You can test which reduction activities will deliver the most impact before committing budget. It also enables you to model different scenarios, compare projected outcomes, and build an executable roadmap linked to specific planned actions.The platform uses digital twin technology to create a virtual model of your operations and value chain. This gives you real-time simulation capability based on your actual data, not generic benchmarks or assumptions.

Key features

• Emission control centralises data collection, calculation, and reporting across all GHG scopes. Emission factors are auto-suggested, calculations are fully traceable, and the platform maintains a complete version history from input to output.
• Reduction roadmap is the built-in scenario simulation engine. You can model different reduction strategies, compare their projected impact, and prioritise actions based on data rather than gut feel.
• CSRD reporting module covers the full compliance workflow, including Double Materiality Assessment, data collection, and reporting with XBRL tagging built in from the start. It covers all ESRS standards.

What customers say

Many of our clients, like Polarn O. Pyret, report going from chasing numbers to driving change. Another sustainability manager at Trophi, Anna Sundbaum, noted that their team was able to extract climate data and connect it to their BI system within a single workday. That level of speed would have been impossible with the other platforms they tested.

Pros

• Built-in scenario simulation lets you test climate decisions before committing budget, a capability very few platforms offer
• Full Scope 1, 2, and 3 visibility with complete calculation traceability and audit-ready version history
• No lengthy implementation or hidden consultancy costs

Cons

• Best suited to Nordic companies, so organisations outside that geography may find the regulatory context less directly applicable

2. Greenly

Best for: Smaller companies starting their carbon tracking journey

Greenly is a carbon accounting platform for SMEs and companies early in their sustainability journey. It offers an accessible way to measure and track emissions across scopes and produce basic sustainability reports.

For larger companies facing complex Scope 3 challenges, CSRD obligations, or the need for decision-grade analytics, Greenly may not offer sufficient depth.

Key features

• Automated carbon footprint calculation connects to bank feeds, accounting software, and other data sources to estimate emissions with minimal manual input
• Scope 1, 2, and 3 tracking gives smaller companies a structured view of their full carbon footprint without requiring deep technical expertise
• Basic sustainability reporting produces output suitable for internal review, stakeholder communication, and early-stage disclosure needs

Pros

• Practical starting point for SMEs with limited sustainability resources
• Automated data connections reduce the manual effort required to build an initial carbon baseline

Cons

• Depth is limited for larger organisations dealing with complex Scope 3 supplier data or advanced CSRD compliance requirements
• Decision-grade analytics and scenario modelling are not available

3. Microsoft Sustainability Cloud

Best for: Organisations already running on the Microsoft ecosystem

Microsoft Sustainability Cloud is a sustainability management platform built on Microsoft Azure and integrated with the broader Microsoft 365 and Dynamics 365 ecosystems. It helps organisations record, report, and reduce their environmental impact across energy, water, and emissions.

Microsoft Sustainability Cloud is a broad platform rather than a deep one. It covers carbon accounting at a functional level but does not offer the simulation depth or reduction scenario modelling that more specialised platforms provide. 

Key features

• Emissions data recording captures Scope 1, 2, and 3 data across the organisation and connects it to the existing Microsoft data infrastructure
• Microsoft ecosystem integration links sustainability data with Dynamics 365, Power BI, and Azure, making it easier to embed climate metrics into existing business workflows
• Reporting and disclosure tools produce output aligned to common ESG frameworks and support basic sustainability disclosure needs

Pros

• Deep integration with Microsoft 365 and Dynamics 365 reduces setup friction for organisations already running on Microsoft infrastructure
• Power BI connectivity makes it straightforward to visualise emissions data alongside other business performance metrics

Cons

• Carbon accounting depth is limited
• Reduction scenario modelling is not a core capability

4. Normative

Best for: Mid-market companies building their first carbon baseline

Normative focuses on carbon accounting, helping companies calculate and report their full carbon footprint across all 3 scopes. It uses the GHG Protocol as its foundation and offers a library of emissions factors to support calculations.

The platform suits companies that are early in their climate measurement journey. It provides a clear structure for organising, calculating, and reporting emissions data. However, if you want to go beyond measurement to reduction planning, it falls short.

Key features

• GHG Protocol-based carbon accounting provides companies with a recognised, structured methodology for calculating emissions across all three scopes
• The emissions factor database provides a library of factors to support calculations, reducing time spent sourcing data manually
• Carbon footprint reporting produces output suitable for disclosure, internal review, and target-setting

Pros

• Strong GHG Protocol alignment makes it a reliable starting point for companies building their first carbon baseline
• Accessible enough for teams without deep carbon accounting expertise to get started quickly

Cons

• Reduction planning depth is limited
• CSRD-specific workflows are not a core strength

5. Sweep

Best for: Mid-market companies managing carbon data and supplier engagement

Sweep is a carbon management platform that helps companies collect emissions data, track progress against targets, and produce sustainability reports. It covers Scope 1, 2, and 3 and includes supplier engagement features.

Sweep does not offer the deep simulation or reduction scenario modelling that tools like Emission Twin provide. For companies focused primarily on structured reporting and supplier data collection, it is a capable mid-market option.

Key features

• Scope 1, 2, and 3 tracking gives companies a structured way to collect and organise emissions data across their full carbon footprint
• Supplier engagement tools let you reach out to suppliers directly within the platform to collect emissions data and improve Scope 3 accuracy
• Progress tracking against targets shows how current emissions trends compare to reduction goals over time

Pros

• Clean, accessible interface makes it usable for sustainability teams without a technical background
• Scope 3 supplier engagement is built into the platform, helping address one of the hardest data collection challenges

Cons

• Scenario simulation is limited, so you cannot model the impact of different reduction strategies before committing to them
• Less suited to organisations with advanced CSRD workflows or complex regulatory reporting requirements

6. Plan A

Best for: European mid-market companies building structured carbon and ESG programmes

Plan A is a sustainability platform that helps companies measure, manage, and reduce their carbon footprint. It covers Scope 1, 2, and 3 emissions and supports a range of ESG reporting frameworks, including CSRD, GHG Protocol, and GRI.

The platform is designed for mid-market European companies that need a structured approach to carbon accounting and sustainability disclosure. It combines emissions tracking with some reduction-planning functionality and offers a clean interface that suits sustainability teams managing reporting without extensive technical resources.

Key features

• Scope 1, 2, and 3 carbon accounting gives companies a structured way to measure their full emissions footprint aligned to the GHG Protocol methodology
• CSRD and GRI-aligned reporting supports EU regulatory disclosure requirements and produces output that can be used for structured sustainability reports
• Reduction tracking allows companies to set targets, monitor progress, and track the impact of reduction initiatives over time

Pros

• Strong European market focus makes it more contextually relevant for companies operating under CSRD and other EU frameworks than many US-built alternatives
• Clean interface and structured onboarding make it accessible for mid-market sustainability teams without large technical resources

Cons

• Reduction scenario modelling is limited compared to platforms like Emission Twin
• Less suited to organisations with complex Scope 3 supplier calculations or the need for decision-grade analytics at the leadership level

7. Persefoni

Best for: Corporations and financial institutions with complex carbon disclosure needs

Persefoni is a carbon accounting software focused on carbon footprint measurement, reporting, and disclosure. It supports frameworks including TCFD, the GHG Protocol, and the PCAF, and is used by both corporate and financial-institution clients.

The platform is positioned at the more technical end of carbon accounting. It handles complex organisational structures and is used by larger organisations with demanding disclosure requirements. However, its primary focus is measurement and disclosure rather than active reduction planning.

Key features

• TCFD and PCAF-aligned reporting makes it a strong fit for financial institutions and corporates with investor-facing disclosure requirements
• Carbon footprint calculation engine handles complex organisational structures with multiple entities, geographies, and data sources
• Disclosure workflow management guides teams through producing structured, framework-aligned climate disclosures

Pros

• Strong technical depth in carbon accounting
• Well-suited to financial institutions that need PCAF-aligned reporting 

Cons

• Less contextual fit for companies operating primarily under EU regulatory frameworks
• Reduction planning and scenario simulation are not core strengths

8. Watershed

Best for: Large enterprises running comprehensive carbon programmes

Watershed is a carbon management platform targeting larger enterprises with ambitious climate programmes and complex supply chains. It offers carbon accounting, reporting, supplier engagement, and some reduction planning features.

The platform handles complex organisational structures and is used by large technology and consumer companies. It is primarily built for the global enterprise market. Smaller sustainability teams may find it over-engineered.

Key features

• Enterprise carbon accounting handles emissions data across large, complex organisations with multiple business units and geographies
• Supply chain engagement enables companies to collect supplier emissions data, improving the accuracy of Scope 3 calculations
• Reduction planning tools provide some capability for tracking progress against climate targets and identifying areas for action

Pros

• Built to handle the scale and complexity of large enterprise carbon programmes with multiple entities and data sources
• Supply chain features help large organisations address Scope 3 supplier emissions in a structured way

Cons

• Designed primarily for the US and global enterprise market, EU regulatory context and CSRD specifics are less central
• Over-engineered for mid-sized organisations that need speed and simplicity over enterprise scale

9. Agentforce Net Zero (formerly Net Zero Cloud)

Best for: Organisations already running on Salesforce CRM infrastructure

Agentforce Net Zero is a sustainability management platform built within the Salesforce ecosystem. It helps companies track emissions, manage energy data, and produce sustainability reports using the same infrastructure that many sales and operations teams already use.

Agentforce Net Zero is broader than it is deep on carbon accounting. It works well as a data management and reporting layer for organisations already on Salesforce. For companies with complex Scope 3 challenges, CSRD obligations, or the need for reduction scenario modelling, more specialised platforms will serve them better.

Key features

• Emissions tracking across all scopes captures Scope 1, 2, and 3 data and organises it within the Salesforce data model, connecting sustainability metrics to existing business records
• Salesforce ecosystem integration links sustainability data with Sales Cloud, Experience Cloud, and other Salesforce products, making it easier to surface climate metrics across the organisation
• Sustainability reporting tools produce disclosure-ready output aligned to common frameworks, including GHG Protocol and TCFD

Pros

• Deep Salesforce integration reduces implementation friction for organisations already running core business operations on the platform
• Connecting emissions data to existing customer, supplier, and operational records gives a more complete picture of where emissions originate across the value chain

Cons

• Carbon accounting depth is limited compared to dedicated platforms
• Functions primarily as a data recording and reporting layer rather than a climate decision support platform

How to choose the right carbon accounting software