The Best Carbon Accounting Software 2026

Carbon accounting was once solely the domain of traditional environmental consultants. However, as urgency around the climate crisis has grown, carbon accounting platforms have emerged as an easier and more efficient way to track and report greenhouse gas emissions data.

Today, there are tons of software platforms built specifically to help you measure and track your carbon emissions so you can build a more environmentally-conscious company and share your impact transparently with customers, partners, and other stakeholders.

The tricky part is finding the right software - with so many options it’s easy to get confused and overwhelmed with choice. Every platform has its pros and cons and there are different options for different sizes and types of business

In this article, we’ll show you the best carbon accounting software platforms on the market in 2026

What does carbon accounting software do?

Carbon accounting software lets you track your greenhouse gas emissions and pinpoint which activities drive the most impact. You can then make targeted changes to your operations, resources, and supply chain to cut your carbon footprint.

Most platforms measure across three categories - known as scopes. Scope 1 covers direct emissions from sources you own or control, like company vehicles and on-site fuel. Scope 2 covers indirect emissions from purchased energy, such as electricity and heating.

Scope 3 captures everything else in your value chain: business travel, purchased goods, employee commuting, and supplier emissions. It typically accounts for over 70% of a company's total footprint.

The best platforms go beyond spend-based calculations. They use activity data - actual fuel consumed, kilometres driven, energy metered - to build a footprint that reflects real-world changes.

A spend-based estimate won't drop when you switch to a greener supplier. An activity-based measurement will. That distinction matters if you want your scope 3 emissions tracking to drive genuine reductions.

The solution you choose depends on your needs, your budget, and your industry. So let's look at 15 of the best carbon accounting software platforms out there.

The Best Carbon Accounting Software in 2026

We've collated a list of our personal favourite 15 carbon accounting tools. Each with its own strengths and weaknesses depending on your business.

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1. Seedling

Seedling’s carbon accounting software is built for growing businesses - typically up to 2,000 employees - that need a rigorous, GHG Protocol-aligned carbon footprint and Net Zero roadmap without the overhead of enterprise software or a traditional consulting project. Trusted by 500+ businesses, it's built for businesses where carbon sits alongside a full plate of other responsibilities - whether that's an ops or compliance manager picking it up as part of their role, or a solo sustainability professional who needs serious software without the complexity.

Every Seedling customer gets a dedicated carbon expert who guides them through measurement, analysis, and reduction planning - not just access to a platform. That one-to-one support model is central to what makes Seedling different.

On accuracy, Seedling goes beyond spend-based analysis to use activity data wherever possible - from supplier emissions to employee commuting habits, captured via a built-in survey tool. This matters because a footprint that only tracks spend won't actually go down as you make changes; one built on activity data will.

The platform covers Scopes 1, 2, and 3 in full, with outputs assured to meet GHG Protocol and ISO 14064 standards. It's well-suited to businesses with common reporting requirements - B Corp Climate Action (including Climate Transition Plans), PPN 006 (06/21) Carbon Reduction Plans for public sector bids, SECR, SBTi target-setting, EcoVadis, and client or investor reporting.

2. Persefoni

Based in Tempe, Arizona, Persefoni’s carbon accounting platform is designed for enterprises and financial institutions. This means its features are aimed at bigger organizations and focus on stakeholder communication and complying with climate regulations.

Persefoni is designed to make carbon accounting transparent and reliable, even for major companies with large amounts of data to manage. However, it is expensive and can be complex.

3. Greenly

Greenly is based in Paris and again focused on larger organizations. Its features help users to measure their carbon footprint and take concrete steps to reduce and offset their emissions.

Greenly is especially impressive for its integrations with more than 100 enterprise software platforms in areas like cloud data, accounting, and electricity, though this may not be a great fit for companies with simpler needs. Support may be limited for small and medium -sized organisations.

4. Normative

Normative, based in Stockholm, aims to give businesses everything they need to measure their emissions, meet their targets, and comply with necessary regulations. Their team of climate strategy advisors are there to help you understand carbon accounting and set realistic goals to work towards.

Normative places particular focus on supply chain reporting, helping large organisation with global supply chains collect and manage complex datasets. 

5. Minimum

London-based Minimum provides carbon accounting software for enterprises. The features are geared towards gaining high-level insights into data and meeting disclosure requirements.

If you’re an enterprise-level organization and want to take a highly sophisticated and data-driven approach to carbon accounting, Minimum may be an excellent choice.

6. Ecologi

Founded by Elliot Coad, Ecologi began life as a subscription service app helping consumers and businesses to invest in nature-based climate action initiatives, such as tree planting. In the last few years, they’ve transitioned to also help businesses measure their emissions.

It’s affordable, simple, and is a great solution if you want a rough, quick overview of your carbon footprint. However, it’s not as accurate as the more advanced options on this list, and comes with minimal support.

7. Greenr

Greenr is based in London and helps businesses and employees track their emissions with a mobile app. It also provides guidance on how to reduce and offset emissions. 

Greenr is spend-based, which means it calculates emissions based on how much you spend on specific goods and services, as opposed to directly calculating emissions based on activities. It’s straightforward and affordable, but doesn’t offer the same bespoke, detailed support that you’ll get with more advanced alternatives.

8. SageEarth

SageEarth was originally called Spherics — a carbon accounting tool based in Bristol, UK, — and was acquired by ERP giant Sage in 2022.

SageEarth’s quick and easy tool lets you calculate your carbon footprint after connecting with your accounting software, with the option to increase the accuracy of the result by adding more data.

SageEarth’s platform is marketed as a cheap, easy alternative to some of the expensive, bespoke platforms mentioned in this article. The trade-off is that it’s not as in-depth or reliable as pricier options.

9. Plan A

Berlin-based Plan A is a software-as-a-service platform designed to automatically calculate CO2 emissions and produce detailed reports for audits and compliance.

Plan A is aimed at larger companies, and its clients include BNP Paribas, BMW, and Trivago. It has won several awards. Plan A is a good choice for companies who want to invest in a cutting-edge carbon accounting tool with high-end features, and have the budget to match.

10. Sweep

Used by the likes of L’Oreal and BlackRock, Paris-based Sweep is an emissions reporting solution that targets large organisations, and financial institutions in particular.  

It’s enterprise-level features include collaboration tools to help teams manage emissions data across departments, and analysis tools for large datasets. 

11. Coolset

Amsterdam-based Coolset provides automated carbon accounting software. Its focus is on regulatory reporting, with emphasis on CSRD compliance for EU organisations. 

Coolset’s reporting functionality is extensive, expanding beyond emissions reporting to sustainability more broadly, including impact and financial materiality assessments. It might be on the expensive side for smaller companies, with prices starting at €9,000 per year for a full-scope carbon footprint.

12. Sustain.Life 

Sustain.Life (which has now been acquired by compliance solution Workiva), is headquartered in New York City and is yet another reporting tool targeted at big businesses. Alongside supporting enterprises directly, Sustain.Life offers APIs to sustainability consultants and developers.  

Going forward, it looks like Sustain.Life will be offered as part of Workiva Carbon, so watch this space as their strategy develops!

13. SINAI

SINAI Technologies Inc. comes with a suite of tools to help businesses model decarbonisation pathways and understand the financial impact of actions taken to reduce emissions (or indeed the risks of a failure to decarbonize!).

SINAI, which is headquartered in San Fransisco, is worth a look for businesses that want to integrate climate change mitigation into broader business forecasts. 

14. Arbor 

Based in Calgary, Canada, Arbor focusses on detailed supply-chain and embodied emissions assessments, in particular for CBAM reporting.

As a result, Arbor is great for large organizations in carbon intensive industries such as construction and apparel, but may be overkill and out of budget for SMEs with less stringent reporting requirements.

. 15Net0

Net0 is based in NewYork and is built on the premise of using artificial intelligence to combat climate change. It comes with a ton of AI tools to collect and analyse emissions data.

Net0 is built mainly for larger organisations (it’s “trusted by Fortune 500 companies”) and government institutions. It’s worth exploring for those with the budget and the desire to take a tech-led approach to carbon accounting.

How Much Does Carbon Accounting Software Cost?

Carbon accounting software spans a wide price range. The right tier depends on your company size, scope coverage needs, and the level of support you require.

Free and freemium tools exist for businesses taking their first steps. These typically cover Scopes 1 and 2 with spend-based estimates. They work well as a starting point, but usually lack the depth and support needed for credible reporting.

SME-tier platforms generally cost hundreds to low thousands per year. At this level, you'll find activity-based measurement, Scope 3 coverage, and some degree of expert guidance. These platforms suit small businesses with straightforward supply chains and standard reporting needs.

Mid-market platforms typically range from around £5,000 to £15,000 per year. They offer deeper Scope 3 capabilities, dedicated support, framework-aligned reporting, and the flexibility to handle moderate complexity. This tier fits businesses with 50 to 2,000 employees that need audit-ready outputs.

Enterprise solutions start at £20,000 per year and climb from there. These platforms handle complex global supply chains, multi-entity structures, and stringent regulatory requirements like CSRD and SEC climate disclosure. They also tend to include advanced analytics, collaboration tools, and bespoke onboarding.

For a deeper breakdown, see our guide to carbon accounting software pricing. You can also review Seedling's pricing directly.

Frequently Asked Questions

What Software Do Companies Use for Carbon Reporting?

Most businesses use dedicated carbon accounting platforms like the 15 reviewed in this guide. The right choice depends on your size, budget, and reporting needs. SMEs often start with accessible platforms like Seedling or Ecologi. Larger enterprises tend to use tools like Persefoni, Sweep, or Plan A. Some businesses still use spreadsheets, but purpose-built software produces more accurate, auditable, and time-efficient results.

What's the Best Tool for Carbon Footprint Reporting?

That depends on your business. For growing SMEs and mid-market companies that need rigorous, supported carbon accounting, Seedling stands out — every customer gets a dedicated carbon expert and activity-based measurement across all three scopes. For large enterprises with complex supply chains, platforms like Persefoni or Normative offer the scale and depth required. The comparison table above helps you match platforms to your specific situation.

Can You Get Free Carbon Accounting Software?

Yes, though with trade-offs. Free tools typically offer spend-based estimates for Scopes 1 and 2. They work for getting a rough picture of your footprint. They won't give you the accuracy, Scope 3 depth, or reporting rigour needed for regulatory compliance or investor scrutiny. Seedling offers a free business carbon calculator to help you get started before committing to a full platform.

What's the Difference Between Carbon Accounting Software and a Sustainability Consultant?

Carbon accounting software gives you a platform to measure, track, and report your emissions on an ongoing basis. A sustainability consultant provides bespoke, hands-on guidance — often for a specific project or assessment. Some platforms (like Seedling) blend both by pairing software with dedicated expert support.

The best choice depends on whether you need continuous measurement or one-off advisory. Our detailed comparison of carbon accounting software vs a sustainability consultant walks through the pros and cons of each approach.

Make an Informed Choice

Carbon accounting software now spans every budget and business size.

Large organisations can find platforms built for complex regulatory requirements and real-time reporting. SMEs can find tools that help them understand their emissions, engage clients, and get on the path to Net Zero. There's a solution at every level.

Use the evaluation criteria above to narrow your shortlist. Focus on scope coverage, framework alignment, support quality, and pricing fit for your stage.

Weigh up your options, identify what fits, and connect with the right partner.

Want to learn more about Seedling? We help businesses make confident, informed decisions — backed by data and climate science, without breaking the bank. Book a demo with us.

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