Head of Decarbonisation Solutions
5 min read
Carbon reporting in the UK is no longer a nice-to-have. With SECR obligations already embedded in law, supply chains demanding emissions data from their suppliers, and CSRD creating downstream pressure across UK supply chains, UK businesses are under real pressure to get their numbers right and act on them.
The challenge is that “carbon accounting software” now covers a wide spectrum, from entry-level footprint calculators to enterprise sustainability suites with full ESG data management. Choosing the wrong tool means either overpaying for complexity you don’t need, or under-investing in something that can’t take you where regulations are heading.
This guide compares the five best carbon accounting platforms for UK businesses in 2026, covering who each one is right for, what they do well, and where the gaps are.
Quick comparison
Platform | Best for | Scope 1-3 | SECR/PPN Ready | UK-specific | End-to-end |
|---|---|---|---|---|---|
Ecologi | UK SMEs, mid-market and large businesses | Yes | Yes | Yes | Yes |
Greenly | SMBs wanting broad ESG coverage | Yes | Partial | Partial | Partial |
Normative | Enterprise with complex LCA needs | Yes | No | No | Partial |
Watershed | Large enterprise, complex supply chains | Yes | No | No | Partial |
Sweep | Enterprise ESG data management | Yes | No | No | Partial |
1. Ecologi (Best for UK SMEs, Mid-Market and Large Businesses on one platform)
Ecologi is the UK’s most trusted climate action platform, working with over 16,000 businesses including Co-op, O2, ITV, Ubisoft, as well as 300+ B Corps. What sets it apart from every other platform on this list is the breadth and depth of what it actually covers. Where most tools stop at measurement and reporting, Ecologi takes businesses through its science-aligned 3Rs Framework: Reduce your emissions, Restore our planet, and Report your progress.
It’s the only platform in the market that’s been built end-to-end for the full net-zero journey: GHG Protocol-aligned measurement, SBTi target-setting, access to high-integrity carbon credits and nature restoration, and compliance reporting for UK and supply chain requirements. All of that sits within a shared platform, governed by an independent expert committee and aligned to the GHG Protocol, SBTi, and Oxford Principles.
What it covers
Reduce: Scope 1, 2, and 3 carbon measurement best practice using GHG Protocol-aligned methodologies, including industry-endorsed sector protocols. SBTi target-setting support, emissions reduction planning, and specialist expert support. Their easy to use carbon accounting platform and carbon accounting support team guide you through every step.
Restore: You also get access to a verified portfolio of carbon credits and nature-based solutions, assessed through Ecologi’s bespoke Carbon Project Assessment Framework (CPAF). These projects span carbon avoidance, removal, and biodiversity restoration, all aligned to Oxford Principles and the voluntary carbon market’s highest integrity standards. Ecologi’s community has collectively funded the planting of over 95 million trees, the avoidance or removal of 4.1 million tonnes of CO2e, and the conservation of over 6 million m² of natural habitat.
Report: Ecologi provides compliance support across SECR, PPN 006 (formerly PPN 06/21), SBTi and B Corp. Alongside official reporting templates, you also get access to stakeholder communication tools as well as greenwashing-safe progress reporting that meets supply chain and regulatory disclosure requirements.
Why it stands out for UK businesses
Most platforms on this list originate in the US or France and have retrofitted UK compliance support. Ecologi is built around the UK market and UK regulatory context. Its platform is designed to address the two main drivers for UK business leaders which were identified in their 2026 Climate Commitments Survey: taking measurable steps toward net-zero as an essential element of protecting future revenue, and financial constraints like the high cost of tools remaining the biggest barriers to action year-on-year. 83% of the 1,600 UK business leaders agreed that this is where they needed most support.
It’s also the only platform in this comparison that meaningfully combines carbon accounting software with direct access to high-integrity carbon credits and nature restoration, so businesses are able to measure and reduce their emissions, fund high quality climate projects and report on their progress all under one platform. Businesses that have taken action to reduce their emissions report an average 14.4% uplift in revenue and 13.4% improvement in operational efficiency, according to Ecologi’s 2026 research.
Ecologi is a certified B Corp, rated in the Top 5% for Environment and Governance, and holds an average 4.8 rating on Trustpilot.
Things to consider
Ecologi is designed for SMEs, mid-market and large UK businesses. Very large enterprises requiring multi-entity consolidation or sophisticated Scope 3 supplier engagement workflows at scale may need to evaluate whether additional enterprise-level integrations meet their requirements.
Best for: UK SMEs, mid-market and large businesses wanting a complete, science-aligned net-zero journey from measurement through to verified climate action and reporting.
2. Greenly (Best for SMBs wanting broad ESG coverage)
Founded in Paris in 2019, Greenly is a European carbon accounting platform covering GHG assessment across Scopes 1, 2, and 3, life cycle analysis, and ESG management. It offers accessible onboarding for smaller businesses new to carbon measurement.
What it covers
Greenly handles GHG Protocol-aligned emissions tracking and supports CSRD, SBTi, and CDP reporting frameworks. It offers industry-specific tailoring for a range of sectors and has supplier engagement functionality for Scope 3 data collection.
Things to consider
Greenly’s strength is breadth across ESG data rather than depth or action on any single pillar. Its outputs require careful internal verification according to independent reviews, particularly for businesses without a dedicated sustainability resource. Critically, it doesn’t provide access to carbon credits or nature restoration, so businesses will need a separate solution to act on their emissions data once they have it.
Best for: SMBs and European mid-market businesses wanting broad ESG coverage across multiple reporting frameworks, where acting on emissions data is a secondary priority.
3. Normative (Best for Enterprise with complex LCA needs)
Normative is a Stockholm-founded enterprise carbon accounting platform built around a proprietary spend-based and activity-based data model. It’s designed for large organisations that need audit-ready emissions data and access to expert climate strategy consulting alongside their software.
What it covers
Normative covers full Scope 1, 2, and 3 accounting and supports CSRD, TCFD, SBTi, and CDP reporting. Its spend-based methodology and life cycle analysis capability make it a strong fit for organisations where procurement data is the primary input for emissions calculations, and where access to in-house climate expertise is limited.
Things to consider
Normative is built and priced for enterprise. UK mid-market businesses may find the offering over-specified. Like Greenly, it doesn’t extend into carbon credits or nature based solutions. Its focus is measurement and strategy rather than end-to-end delivery.
Best for: Large enterprises needing spend-based Scope 3 methodology and life cycle analysis.
4. Watershed (Best for large enterprises with complex supply chains)
Watershed has established itself as a leading enterprise carbon management platform. Its core strength is audit-grade data accuracy combined with streamlined workflows for regulatory compliance and decarbonisation planning.
What it covers
Watershed offers full Scope 1, 2, and 3 accounting, integrating with over 60 business systems to automate data collection. It supports CSRD, TCFD, and SEC reporting, and includes scenario-based modelling so businesses can project the emissions impact of different reduction strategies. Its supplier engagement tools are among the more developed on the market.
Things to consider
Watershed is built for large enterprises with established internal sustainability teams and complex data infrastructure. It’s headquartered in the US, and while it has a UK office and European clients, its compliance depth is primarily oriented toward US and global enterprise requirements. UK SMEs, mid-market and larger businesses are outside its core fit, and pricing reflects enterprise positioning. Watershed doesn’t provide direct access to verified carbon credits or nature-based solutions.
Best for: Large enterprises and multinationals with significant Scope 3 exposure, complex supplier data requirements, and board-level sustainability programmes.
5. Sweep (Best for enterprise ESG data management)
Sweep is a sustainability data management platform built primarily for enterprise and mid-market organisations that need to manage broad ESG data beyond carbon alone. It targets organisations with complex, multi-stakeholder reporting requirements across CSRD, SFDR, TCFD, and CDP.
What it covers
Sweep handles Scope 1, 2, and 3 GHG accounting, supplier-level emissions tracking, and ESG data management within a single platform. Its supplier collaboration tools allow suppliers to input data directly, track their own emissions, and share reduction targets, making it well suited to organisations with complex value chains.
Things to consider
Sweep’s focus is on enterprise data management and compliance rather than on guiding businesses through the practical steps of reducing and funding climate action. It doesn’t offer access to carbon markets or nature-based solutions. For UK businesses in the earlier stages of their climate journey, the platform may feel more complex than necessary.
Best for: Enterprise and upper mid-market businesses managing complex ESG data and multi-framework compliance obligations.
How to choose the right platform
The right choice depends on two things: where your business is now, and what you are trying to achieve.
If you’re a UK SME, mid-market or large business that wants to measure your emissions, build a credible reduction plan, access high-integrity carbon credits, and meet UK and supply chain reporting requirements, then Ecologi is the most complete solution available. Its science-aligned 3Rs Framework covers the full journey, and its UK roots mean the platform and its support are built around the regulatory and market context you are actually operating in.
If you need broad ESG coverage at SMB level, Greenly is worth evaluating, though factor in that acting on your emissions data will require a separate solution.
If you’re a large enterprise prioritising spend-based Scope 3 methodology or life cycle analysis, Normative is the strongest fit, with Watershed the leader for complex supplier data workflows at scale.
If managing ESG data across multiple global frameworks is the primary requirement, Sweep is the most capable data management platform on this list.
If SECR compliance is your immediate driver, Ecologi is the only platform here built specifically around the UK regulatory landscape, including SECR, PPN 006, and supply chain disclosure requirements.
Why UK businesses can’t afford to wait
Climate change is already costing UK businesses. Ecologi’s 2026 Climate Commitments Survey, conducted with BusinessGreen across 1,600 UK business leaders, found that 70% of UK businesses report annual turnover losses of more than 1% due to climate-related impacts, with 40% reporting losses of 6% or more. Nearly 90% have experienced at least one direct climate-related impact in the past two years.
Regulatory pressure compounds this. SECR already requires large UK companies to disclose energy use and emissions publicly. PPN 006 makes a Carbon Reduction Plan a requirement for all UK public sector and NHS suppliers. And the downstream effect of large-scale businesses requiring reporting for their supply chains, means even businesses not directly in scope of regulatory reporting are increasingly required to provide emissions data to the customers and partners who are.
Despite this, 83% of UK businesses agree that taking measurable steps toward net-zero is essential to protect future revenue, and those who have taken action report double-digit commercial returns: an average 15.5% uplift in brand image, 14.4% increase in revenue, and 13.4% reduction in operational costs.
The best carbon accounting software for your business is not just the one that produces the most defensible GHG inventory. It’s the one that helps you do something useful with it.
See how Ecologi compares for your business
Over 16,000 UK businesses use Ecologi to measure their emissions, take verified climate action, or report with confidence. If you’re ready to move beyond the spreadsheet and build a credible net-zero strategy, we can help.