Carbon reporting software for UK companies

What carbon reporting software does

A good platform pulls in activity data — energy use, fuel, travel, purchased goods — and converts it into emissions using the UK Government's DESNZ conversion factors, then organises the result by Scope 1, 2 and 3 for disclosure 1653. Beyond calculation, the better tools manage the parts that matter for compliance: maintaining an audit trail, supporting the GHG Protocol's data-quality expectations, handling Scope 3 across the 15 value-chain categories, and producing outputs that map to SECR's statutory format and UK SRS S2's disclosure requirements 55544.

As UK SRS extends mandatory climate reporting to listed companies from 2027, and Scope 3 follows on a comply-or-explain basis from 2028, the ability to track value-chain emissions and evidence the method becomes the differentiator 64. The software that succeeds will be those that can demonstrate verifiable methodology and comprehensive coverage rather than basic carbon calculators 58.

How to choose — the criteria that matter

For UK companies, we'd weigh a tool against the things that actually determine whether it produces a defensible disclosure:

• UK standards alignment — does it map cleanly to SECR's statutory format and UK SRS S2, not just generic ESG output? [10][1]
• DESNZ factor integration — does it use the current UK Government conversion factors, updated annually? [16]
• Scope 3 coverage — can it handle all 15 categories, and both spend-based and activity-based methods? [54][55]
• Assurance readiness — does it keep the audit trail and methodology documentation that third-party assurance (and UK SRS S2's verifiability expectation) requires? [4][21]
• Usability and UK support — onboarding, data integrations, and support that understands UK regulation [58]
• Transparent pricing — clear pricing rather than opaque "contact us only" [58]

Our editorial pick

Carbon reporting software to consider

The platforms below all serve UK carbon reporting; we've described each against the criteria above so you can judge fit for your situation. This is our own independent assessment, not a paid placement, and the list is not a strict ranking — start with our editorial pick above, then weigh the alternatives against your needs.

• Greenly — Carbon management platform covering Scopes 1–3 with spend- and activity-based methods; positions itself for SME and mid-market measurement and reduction [54][55].
• Normative — Carbon accounting platform with a strong Scope 3 and value-chain focus, often paired with advisory support for reduction planning [54].
• Sweep — Enterprise sustainability and carbon management platform aimed at larger organisations managing complex value-chain data and multi-framework reporting [58].
• Watershed — Established enterprise carbon-accounting platform with broad framework coverage; suited to large multinationals with extensive Scope 3 footprints [54][58].
• Persefoni — Enterprise carbon management platform focusing on climate risk assessment and disclosure across multiple frameworks [58].
• Plan A — Sustainability and carbon management platform with emphasis on automated data collection and reduction planning [55][58].

Software vs outsourced reporting

Software suits organisations building an in-house, repeatable reporting process; smaller companies, or those reporting for the first time, sometimes prefer outsourced carbon accounting or consultancy support to get the first inventory right before bringing it in-house 55. Many use a hybrid — software for ongoing measurement, expert review for assurance readiness 4.

The decision often comes down to resource allocation: software requires internal capability development but provides ongoing control and cost efficiency, while consultancy provides immediate expertise but at higher ongoing costs. For UK SRS S2 compliance, the assurance requirements may favour approaches that can demonstrate consistent methodology and comprehensive audit trails 421.