Choosing a carbon footprint and ESG reporting software

Quick answer. To choose a carbon footprint and ESG reporting software, an SME checks five criteria: integration of the ADEME Base Empreinte emission factors, coverage of scopes 1, 2 and 3, ease of data collection, the expected export formats (VSME, ESRS) and the link with accounting. No need to over-size: most SMEs are not subject to the CSRD.

The market for carbon accounting and extra-financial reporting software has exploded, driven by the regulatory wave. For an SME, the risk is not a lack of offers, but choosing an over-sized tool, calibrated for the obligations of large groups, when regulation does not require it. This buying guide offers a criteria-based reading grid, without naming any brand: it is up to you to compare it with the market solutions. The aim is to connect the choice of tool to your real obligation and your use cases, not to an impressive but useless feature list.

Before comparing solutions, the obligation must be clarified. Since the "Omnibus" simplification package adopted in early 2026, the CSRD directive only targets companies with more than 1,000 employees and more than 450 million euros of turnover, for financial years beginning on or after 1 January 2027. The vast majority of SMEs, already out of scope, stay out. The only ordinary-law regulatory carbon report remains the BEGES, mandatory above 500 employees.

As a result, an SME that adopts a software rarely does so out of direct obligation, but to respond to its large clients, its banks or its investors, who ask their suppliers for ESG data. For these needs, a light standard exists, the VSME (voluntary SME standard) delivered by EFRAG in late 2024, designed precisely for SMEs outside the CSRD. It is this level of requirement, not that of the full CSRD, that should guide the choice.

A carbon footprint is only reliable if its emission factors are. In France, the reference is ADEME's Base Empreinte, which now incorporates the former Base Carbone. A credible software must rely on these official factors, ideally natively and kept up to date. Beware of tools whose factor origin is opaque or frozen: an outdated factor distorts the entire result. Check the update frequency and the ability to trace the source of each factor used.

A good tool covers the three scopes: direct emissions (scope 1), indirect emissions linked to energy (scope 2) and the other indirect emissions of the value chain (scope 3), split into 15 categories. Scope 3 is the most important and the hardest to collect: it often represents the bulk of the footprint, frequently cited between 70 and 90 % of the total depending on the sector. A software that only handles scopes 1 and 2 well gives a partial picture. Check compatibility with recognised methodologies: GHG Protocol, ADEME Bilan Carbone, ISO 14064.

This is the most underestimated criterion. The difficulty of a carbon footprint is not the calculation, it is data collection, especially on scope 3, which depends on suppliers and third parties. A useful tool eases import (connection to energy invoices, purchases, travel), handles missing data with transparent default values, and flags the quality of each data point. For an SME, the simplicity of data entry often matters more than feature richness.

The software must produce outputs suited to your counterparts. For an SME, export in the VSME format is an asset, since it is the voluntary standard designed to answer the demands of clients and banks. If you work with or for companies subject to the CSRD, check compatibility with the ESRS standards, undergoing simplification in early 2026. Conversely, do not pay for full CSRD coverage if none of your counterparts requires it.

Carbon and the euro are increasingly managed together. A software that links with your accounting (retrieving purchases, fixed assets, travel from the entries) drastically reduces collection time and makes the data more reliable. It is also what allows the carbon footprint to be connected to margins and investment decisions. This integration is a point to examine with your chartered accountant, as part of a digital finance transformation.

The classic mistake is to choose the most complete tool "just in case". For an SME outside the CSRD, that means paying dearly for useless coverage and making data entry heavier. Conversely, a home-made spreadsheet quickly hits its limits as soon as scope 3 comes into play. The right level sits between the two: a tool that covers the three scopes with ADEME factors, eases collection and exports in VSME format, without the full ESRS machinery.

Our recommendation: start from the use case (who asks what, by when), not from the software. Most SMEs first need to answer a client or a bank, which calls for a simple tool and a VSME export. The choice then settles on the quality of the factors and the ease of collection, to be validated with your extra-financial reporting advisor. The same tool-choice logic applies to the other management building blocks, as we explain in our guide to choosing accounting software.

A services SME with 80 employees receives, within a few months, three requests: a large client asks for its supplier carbon footprint, its bank asks for ESG indicators for a loan, and a tender requires an emissions report. None of these requests falls under the CSRD: the company is well below the 1,000-employee threshold.

Rather than acquiring a full ESRS platform, priced for listed groups, it chooses a tool covering scopes 1, 2 and 3 with the factors of the ADEME Base Empreinte, able to import its energy invoices and purchases, and to export in VSME format. The project rolls out over 2 to 3 months: a first footprint serves as a baseline, then the tool feeds the answers to clients, the bank and tenders. The investment stays proportionate, and every euro spent answers an identified demand, not an imaginary obligation. The calculation methods, scope by scope, are detailed in our first SME carbon footprint guide.