ESG and sustainability reporting software turns emissions data, supplier disclosures and now CSRD-mandated indicators into the structured, auditable output a company files with regulators, lenders and its own board. This ranking is aimed at mid-sized and larger companies that need to measure Scope 1-3 emissions, tag data to a reporting framework such as the CSRD or the EU Taxonomy, and produce something an auditor or a bank's ESG desk will accept, not at a startup ticking a single voluntary box. We judged how much setup work falls on an in-house sustainability team versus how much requires the vendor's own consultants, what the tool actually costs once modules, users and an implementation project are counted, since not one of the eleven vendors here publishes a price list, whether the emissions and compliance data extracted or entered into the platform exports cleanly with its audit trail intact, and who ultimately owns the vendor, a question that stopped being theoretical in 2025 when two of the eleven companies on this list changed controlling shareholder.
Visibility in this ranking can be paid for. Payment moves a vendor's position within the
shortlist; it never adds a vendor, and it never changes a word of the review. The largest vendors in esg and sustainability reporting software
cannot hold places 1 to 3. How it works: placement disclosure ·
editorial process.
How we ranked these
Setup: connecting real data versus rebuilding a spreadsheet
Every tool here promises to replace the emissions spreadsheet a sustainability team built by hand, but the setup work behind that promise varies enormously. Some vendors, Sami, Position Green and Normative among them, bundle onboarding, a named advisor or a customer success manager into the base price and expect a consulting relationship alongside the software. Others, Coolset most explicitly with its named accelerator programme, or Greenly with its staged, feature-differentiated tiers, are built to be configured largely in-house once utility bills, travel data and supplier records are connected. We looked at how many named compliance modules or frameworks a tool ships out of the box, whether AI-assisted data entry actually reduces manual upload work, and how much of the first quarter is spent on data plumbing rather than on the reporting itself.
The real price: a category that will not publish a number
This is a genuinely unusual pricing market. All eleven vendors in this ranking are quote-only or close enough to it that a buyer cannot get a workable number without a sales call: Greenly names its three tiers but not their prices, third-party estimates put Watershed's enterprise deployments anywhere from roughly $50,000 to well over $250,000 a year, and Greenomy is the only vendor advertising any self-serve free option at all, a trial account rather than a full CSRD-ready plan. That opacity is not a minor irritation here, it is close to the whole category's default, and it means comparing five vendors realistically means sitting through five discovery calls before a single number can be weighed against another.
Getting your data out: emissions data, audit trail and CSRD-tagged points
A CSRD or EU Taxonomy filing has to survive an external audit, so the software holding that data needs to hand back more than a PDF report: the underlying emission-factor calculations, the audit trail of who entered or corrected a figure and when, and, increasingly, data tagged to the specific ESRS or Taxonomy data point it answers. We looked at whether a tool exports structured, machine-readable data rather than only a formatted report, whether corrections to an AI-suggested emissions figure are logged rather than silently overwritten, and whether a company that switches vendors keeps its historical emissions baseline intact rather than starting the multi-year trend line over.
Independence and ownership: the 2025 consolidation wave
Ownership in this category moved fast and concretely in 2025, in a way a buyer signing a multi-year contract cannot ignore. Position Green Group, itself majority-owned by the Nordic private equity firm Norvestor since 2022, acquired the Brussels EU Taxonomy specialist Greenomy in September 2025; two months later, in November 2025, SGS SA, the Swiss testing, inspection and certification group headquartered in Geneva, acquired a majority stake in the French vendor Sami. Both acquired companies still operate under their original brand and, in Sami's case, its original French registration, but the controlling shareholder behind each changed within the same year, which is exactly the kind of fact a due-diligence checklist should catch before a vendor is trusted with several years of emissions history.
Who it's for: carbon accounting, taxonomy specialists, and a module inside something bigger
Three different buyers shop this category. A company whose main job is measuring and cutting its own footprint wants a carbon-accounting specialist like Watershed, Sweep, Normative or Plan A, tools built around emissions measurement first and disclosure second. A company facing a specific EU regulatory deadline, CSRD or EU Taxonomy alignment particularly, is better served by Coolset or Greenomy, both built around named frameworks rather than general carbon accounting. And a large, already-public company that wants ESG disclosures produced inside the same connected environment as its SEC and statutory filings fits Workiva, where sustainability reporting is one module in a much larger platform rather than a standalone product.
The 11 tools, reviewed
#1 Position Green
Swedish ESG software and advisory serving 1,000+ customers across 30+ countries · Sweden · positiongreen.com
CSRD, ESRS, EU Taxonomy and CSDDD in one platform 11 offices across Europe and North America Software bundled with advisory services
Position Green is the largest EU-headquartered name in this ranking by customer count, serving more than 1,000 customers across over 30 countries out of 11 offices in Europe and North America, and it sells software bundled with sustainability advisory rather than as a pure self-serve product. Norvestor, a Nordic private equity firm, has held a majority stake in the Malmö company since April 2022, and Position Green itself became an acquirer in September 2025, buying the Brussels-based EU Taxonomy specialist Greenomy, which also appears independently in this ranking further down. Founded in 2015 by Daniel Gaff, Björn Johansson and Rickard Häll, it now covers CSRD, ESRS, EU Taxonomy and CSDDD compliance alongside Scope 1-3 carbon accounting and supplier sustainability management.
Where it falls short
No published pricing; the advisory-bundled model may cost more and move slower than a pure self-serve tool.
Wrong for
A small team that wants to self-configure a lightweight tool without a consulting relationship attached.
Pricing: Quoted on request; not published. (none)
Visit Position Green →
#2 Normative
Stockholm carbon accounting pioneer bundling a named climate advisor into every account · Sweden · normative.io
Founded 2014 — one of the oldest in this category 349,000 verified emission factors Named Climate Strategy Advisor per account
Founded in Stockholm in 2014 by Kristian Rönn, Adam Wamai Egesa and Robin Undall-Behrend, Normative predates the CSRD-driven wave of newer entrants elsewhere on this list by the better part of a decade, and it still assigns every account a named, GHG Protocol-certified Climate Strategy Advisor rather than leaving a customer to a support queue. The company states it has consulted with the European Commission and contributed to a UN emissions-accounting initiative, and its 349,000 verified emission factors are among the largest factor libraries in this category. It maintains offices in Stockholm, Copenhagen and London.
Where it falls short
No published pricing, and the advisor-bundled model is less purely self-serve than some competitors.
Wrong for
Buyers who specifically want a pure self-serve SaaS tool with no advisory relationship attached.
Pricing: Not published; contact sales. (none)
Visit Normative →
#3 Persefoni
US climate management and accounting SaaS with an advisory board including the founders of CDP, SASB and TCFD · United States · persefoni.com
Advisory board includes CDP, SASB, TCFD founders Serves companies and financial institutions Founded 2020
Persefoni's advisory board includes the founders of CDP, SASB and TCFD, three of the reference frameworks the rest of this category builds its own reporting around, which gives the Tempe, Arizona company an unusually direct line to how those standards are actually meant to work. Founded in 2020 by Kentaro Kawamori (CEO), Jason Offerman (President and COO) and Kim Stroh (Chief Digital and Information Officer), it serves both companies and financial institutions with climate management and accounting software, and lists Xerox, Caliber, Natera and the Pittsburgh Penguins among its named clients.
Where it falls short
No published pricing, and conflicting HQ city cited across public directories (Tempe vs Mesa, AZ).
Wrong for
EU buyers whose procurement policy requires an EU-headquartered vendor.
Pricing: Not published; quote only. (none)
Visit Persefoni →
#4 Plan A
Berlin decarbonisation-first carbon accounting platform, GHG Protocol compliant and TÜV Rheinland certified · Germany · plana.earth
TÜV Rheinland certified methodology B Corp and SOC 2 compliant AI-assisted decarbonisation modelling
Plan A's carbon-accounting methodology carries TÜV Rheinland certification, an independent technical audit most competitors on this list do not claim, on top of B Corp status and SOC 2 compliance. The Berlin company, founded in 2017 by Lubomila Jordanova and Nathan Bonnisseau with a second office in Paris, has raised roughly $40 million total, including a $27 million round in 2023, and lists BMW, Visa, KFC, Sorare, Alphabet and Mollie as clients. Its AI-assisted decarbonisation modelling is built as a first-class feature alongside carbon accounting and disclosure reporting, not an add-on.
Where it falls short
No published pricing, no free tier.
Wrong for
A buyer who only wants pure reporting/disclosure with no reduction-planning features.
Pricing: Quoted on request; not published. (none)
Visit Plan A →
#5 Greenly
Paris carbon accounting platform for SMBs with three clearly named pricing tiers · France · greenly.earth
Built for SMB and mid-market Life cycle analysis (LCA) included Covers TCFD, SBTi, CBAM, EUDR
Greenly is the only vendor in this ranking that names its pricing tiers rather than routing every buyer straight to a single 'book a demo' button: GHG Report Compliance, Climate Action Ready and Net Zero Contributor are feature-differentiated, even though none carries a published number. Founded in Paris in 2019, it covers Scope 1-3 accounting, life cycle analysis and support for TCFD, SBTi, CBAM and EUDR frameworks, aimed squarely at SMB and mid-market buyers rather than the largest enterprises.
Where it falls short
Still no numeric pricing, and add-ons are priced separately.
Wrong for
Large enterprises needing deep multi-entity consolidation beyond the SMB/mid-market design point.
Pricing: Quoted on request; three named tiers (GHG Report Compliance, Climate Action Ready, Net Zero Contributor) with no numeric prices published. (none)
Visit Greenly →
#6 Workiva
US public company offering ESG reporting as one module inside a broader connected-reporting platform · United States · workiva.com
Public company since 2014 IPO (NYSE: WK) ESG module alongside SEC/statutory reporting and SOX 6,700+ customers, 85%+ of Fortune 1000 per vendor
Workiva has been a public company since its 2014 IPO on the NYSE under ticker WK, having started in 2008 as WebFilings before rebranding, and it sells ESG and sustainability reporting as one module inside a much broader connected-reporting platform that also covers SEC and statutory reporting, SOX internal controls and internal audit. The Ames, Iowa company reports more than 6,700 customers and says over 85 percent of the Fortune 1000 use it, which makes it the entry on this list best suited to a finance or investor-relations team that wants ESG disclosures produced in the same connected data environment as its 10-K.
Where it falls short
Buying the ESG capability generally means engaging with the wider Workiva platform.
Wrong for
A small company that wants a lightweight, ESG-only tool without adopting a broader financial-reporting platform.
Pricing: Quoted on request; not published. (none)
Visit Workiva →
#7 Sami
Paris decarbonisation and ESG platform with 2,000+ clients, majority-owned by Swiss testing group SGS since Nov 2025 · France · sami.eco
GHG Protocol, ISO 27001 and B Corp certified 2,000+ clients across Europe 300,000+ emission factors
Sami combines software with consulting and training across Carbon Hub, its Scope 1-3 measurement and net-zero strategy product, and ESG Hub, its sustainability reporting product, and states it serves more than 2,000 clients, the largest customer base of any French vendor in this ranking, from a GHG Protocol, ISO 27001 and B Corp-certified platform. Founded in Paris in March 2020, with additional French offices in Marseille, Bordeaux and Lyon and a London base, it remains headquartered and registered in France. The fact that matters most for a buyer weighing independence, though, is that in November 2025 SGS SA, headquartered in Geneva, Switzerland, acquired a majority stake in Sami. Sami's operating company is still French; its controlling shareholder, since that date, is a Swiss one.
Where it falls short
Majority ownership now sits with a non-EU (Swiss) company since Nov 2025, and there is no published numeric pricing.
Wrong for
A buyer with a strict policy requiring the controlling shareholder, not just the operating company, to be EU-based.
Pricing: Quoted on request; vendor describes positioning as enterprise-grade capabilities at SME-mid-cap pricing, no numbers published. (none)
Visit Sami →
#8 Greenomy
Brussels EU Taxonomy specialist offering a free trial account, now part of Position Green Group · Belgium · greenomy.io
Only tool in this list with a self-serve free trial Narrow focus: EU Taxonomy and CSRD alignment data Distribution alliances with PwC Belgium, Deloitte, Accenture
Greenomy is the only vendor on this list offering any self-serve free trial account, in a category where every other name routes straight to a sales call, and it distributes through alliances with PwC Belgium, Deloitte and Accenture on top of direct sales. Founded in Brussels in 2020, it built specifically for EU Taxonomy alignment and CSRD compliance data for corporates, credit institutions and asset managers, narrower ground than the broader carbon-accounting-plus-reporting suites ranked above it. In September 2025 it was acquired by Position Green Group, the Swedish vendor ranked fourth in this list, and continues to operate as a distinct Brussels-built product rather than being folded into Position Green's brand.
Where it falls short
No dedicated Scope 1-3 carbon accounting depth, no certifications stated, and recently acquired.
Wrong for
A buyer needing deep Scope 1-3 carbon accounting as the primary requirement rather than Taxonomy alignment data.
Pricing: Free trial account advertised on the vendor's own site; paid plans quoted on request beyond that — confirm current depth/limits directly before assuming it covers a full CSRD cycle. (free trial account (the only vendor in this list with any self-serve free option))
Visit Greenomy →
#9 Watershed
Sustainability AI platform managing emissions equivalent to four major economies combined · United States · watershed.com
500,000+ emission factors tracked Carbon removal marketplace ~400 employees
Watershed measures a customer base large enough that the company describes its combined tracked emissions as roughly equivalent to the annual output of France, the UK, Germany and Italy combined, a scale claim none of the ten other vendors here makes. Its client list, Airbnb, Spotify, FedEx, Visa, Walmart, BlackRock, Stripe and four of the top six US banks among them, sits at a different tier than the rest of this category, and it is backed accordingly: a Series C in February 2024 valued the company at roughly $1.8 billion on $239 million raised to date, from investors including Sequoia Capital, Kleiner Perkins and Greenoaks. Founded in San Francisco in 2019 by Christian Anderson, Taylor Francis and Avi Itskovich, it has since opened offices in London, New York, Sydney, Paris, Berlin and Mexico City.
Where it falls short
No published pricing anywhere, and third-party estimates suggest it's among the most expensive tools in this category.
Wrong for
Small or mid-sized companies without enterprise budget, and any EU buyer whose procurement policy requires an EU-headquartered vendor.
Pricing: Not published by the vendor; third-party estimates for enterprise deployments commonly cite a $50,000-$250,000+ annual range, unconfirmed by Watershed itself. (none)
Visit Watershed →
#10 Coolset
Dutch CSRD and EU Taxonomy platform bundling nine compliance modules in one product · Netherlands · coolset.com
9 named compliance modules Unlimited users on base platform Youngest vendor in this category (2022)
Coolset is the youngest company in this ranking, founded in 2022, and it has used that clean slate to name nine separate compliance modules rather than selling one generic 'ESG reporting' product: CSRD reporting, EU Taxonomy alignment, GHG Scope 1-3 accounting, EUDR and a lighter EUDR-for-SME track, EUTR, VSME, PPWR and EcoVadis assessment preparation. The vendor bundles onboarding, a dedicated customer success manager, sustainability researchers and a four-week accelerator programme into the base module price rather than charging extra for hand-holding, which matters given how new most in-house CSRD teams are.
Where it falls short
No certifications (ISO/SOC2/B Corp) stated on its own site, and the shortest track record of any vendor in this category.
Wrong for
Companies wanting deep Scope 1-3 carbon-accounting specialization over broad compliance-framework coverage.
Pricing: Quoted per module; no numeric pricing published by the vendor. (none)
Visit Coolset →
#11 Sweep
Paris-founded carbon and ESG platform named a Leader in the 2026 IDC MarketScape and Verdantix Green Quadrant · France · sweep.net
B Corp certified Registered Entreprise à Mission (France) 2026 IDC MarketScape and Verdantix Leader
Sweep is the only vendor on this list named a Leader in both the 2026 IDC MarketScape for Carbon Management and the 2026 Verdantix Green Quadrant for enterprise carbon management, two of the sustainability-software category's more closely watched independent scorecards. The Paris company, founded in 2020 by Rachel Delacour, Yannick Chaze and Raphael Güller, is a certified B Corp and a registered Entreprise à Mission under French law, and holds membership in the World Bank's Carbon Pricing Leadership Coalition, France Invest and IETA. It opened a Denver, Colorado office in 2025 alongside its existing Paris and London bases, a sign of an EU vendor building US enterprise coverage rather than the more common direction of travel.
Where it falls short
No published pricing, no free tier.
Wrong for
Buyers wanting a numeric price before a sales call.
Pricing: Not published; quoted after a demo. (none)
Visit Sweep →
What the data says about this market
This category splits clearly along headquarters lines: eight of the eleven vendors ranked here are EU-headquartered and three are US-headquartered. France accounts for three, Sweep, Greenly and Sami; Sweden for two, Position Green and Normative; and Germany, the Netherlands and Belgium one each, Plan A, Coolset and Greenomy respectively. The three US vendors, Watershed, Persefoni and Workiva, are also the three with the largest disclosed funding or public-market scale, which means a buyer choosing between an EU and a US vendor in this category is often also choosing between a smaller, EU-regulation-native specialist and a larger, better-capitalized platform built first for US and global enterprise budgets.
Published pricing is close to nonexistent across the category. Every vendor except Greenomy routes a prospective buyer straight into a sales conversation with no number attached anywhere on its website, and Greenomy's exception is a free trial account rather than a fully priced self-serve plan, meaning even the one apparent departure from the pattern still ends in a quote for anything beyond evaluation. For a category selling compliance software against hard regulatory deadlines, that near-total absence of a starting price is a real obstacle for a smaller finance or sustainability team trying to build a shortlist before committing to discovery calls with all eleven vendors.
2025 brought a genuine consolidation wave rather than isolated deals. Position Green Group, the Swedish vendor ranked fourth in this list and itself majority-owned by the private equity firm Norvestor since April 2022, acquired the Brussels-based EU Taxonomy specialist Greenomy in September 2025. Two months later, in November 2025, SGS SA, the Geneva, Switzerland-headquartered testing and certification group, acquired a majority stake in the Paris-founded vendor Sami. Both moves point the same direction: larger, better-capitalized groups buying up specialist ESG software companies as CSRD and EU Taxonomy compliance becomes a mandatory line item for thousands of companies rather than a voluntary one for a few hundred.
The 11 ranked vendors, counted
- Headquarters by region: Europe 8, North America 3
- By country: France 3, United States 3, Sweden 2, Belgium 1, Germany 1, Netherlands 1
- Pricing model: Quote only 8, Free trial + quote 1, Quote only, named tiers 1, Quote only, per module 1
- Free option: None 10, Free trial account (the only vendor in this list with any self-serve free option) 1
Counted from the 11 vendors on this page. More in our market data.
For the wider market behind esg and sustainability reporting software, read our report The Global Shift to ICT Services,
or browse all industry reports.
Questions and answers
What is the best ESG reporting software in 2026?
Watershed is our top pick for large enterprises wanting the most analyst-recognized US carbon platform, tracking emissions at a scale the company compares to the combined annual output of France, the UK, Germany and Italy, for clients including Airbnb, Spotify, FedEx and Visa. Coolset is the better choice for an EU mid-market company facing a specific CSRD or EU Taxonomy deadline, bundling nine named compliance modules into one Amsterdam-built platform. Sweep suits a buyer who wants independent analyst validation first, having been named a Leader in both the 2026 IDC MarketScape and the 2026 Verdantix Green Quadrant for carbon management.
Are most ESG reporting vendors European or American?
European. Eight of the eleven vendors in this ranking are EU-headquartered: three in France (Sweep, Greenly, Sami), two in Sweden (Position Green, Normative), and one each in Germany (Plan A), the Netherlands (Coolset) and Belgium (Greenomy). Only three are US-headquartered: Watershed, Persefoni and Workiva. The three US vendors are also generally the largest by disclosed funding or public-market scale, so the EU-versus-US choice often doubles as a choice between a regulation-native specialist and a bigger, better-capitalized platform.
Which tools are built specifically for CSRD and the EU Taxonomy, rather than general carbon accounting?
Coolset and Greenomy are the two vendors in this ranking built around named EU regulatory frameworks first. Coolset bundles nine modules including CSRD reporting, EU Taxonomy alignment, EUDR, EUTR, VSME and PPWR into one platform. Greenomy focuses more narrowly on EU Taxonomy alignment and CSRD compliance data specifically for corporates, credit institutions and asset managers. The other nine vendors are built primarily as carbon-accounting or broader ESG platforms, with disclosure and regulatory reporting layered on top of emissions measurement rather than the other way around.
Is there a free tier for any of these tools?
Only one. Greenomy is the sole vendor in this ranking offering any self-serve free option, a free trial account advertised directly on its website. Every other vendor, all ten of them, is quote-only with no published free tier or self-serve entry point. Even Greenomy's free trial should not be assumed to cover a full CSRD reporting cycle; confirm its depth and limits directly with the vendor before relying on it.
Which vendors changed ownership in 2025?
Two did. Position Green Group, the Swedish vendor ranked fourth in this list, acquired the Brussels-based EU Taxonomy specialist Greenomy in September 2025. Two months later, in November 2025, SGS SA, headquartered in Geneva, Switzerland, acquired a majority stake in the Paris-founded vendor Sami. Both acquired companies continue operating under their original brand and, for Sami, its original French registration, but the controlling shareholder behind each changed within a two-month window in late 2025.
What is the difference between carbon accounting software and full ESG or CSRD reporting software?
Carbon accounting software, the core of what Watershed, Sweep, Normative and Plan A do, measures greenhouse gas emissions across Scope 1, 2 and 3 and tracks progress against reduction targets. Full ESG or CSRD reporting software goes further, structuring that emissions data alongside governance and social indicators into the specific data points a regulatory framework like the CSRD's ESRS standards or the EU Taxonomy requires, often with audit-ready traceability back to source data. Coolset and Greenomy are built closest to the second definition; several other vendors on this list do both under one roof.
Does any vendor here bundle software with human advisory services?
Three do, explicitly. Sami combines its Carbon Hub and ESG Hub software with consulting and training services. Position Green bundles software with sustainability advisory across its more than 1,000 customers. Normative assigns every account a named, GHG Protocol-certified Climate Strategy Advisor rather than a support queue. Buyers who want a purely self-serve software product without an advisory relationship attached should look instead at Coolset, Greenly or Greenomy.
Why do none of these vendors publish their pricing?
Real deployment cost depends heavily on entity count, historical data backlog, module selection and whether implementation or advisory services are bundled in, variables that differ enough between customers that most vendors prefer a scoped quote to a misleading list price. It is nonetheless an unusually consistent pattern across this specific category: all eleven vendors here are quote-only or effectively so, with Greenomy's free trial the only self-serve exception, which is a higher rate of pricing opacity than most software categories on this site show.
Is Persefoni headquartered in Tempe or Mesa, Arizona?
Persefoni is founded and generally cited as headquartered in Tempe, Arizona, though some public business directories list a Mesa, Arizona address for the company. The discrepancy shows up across independent sources rather than in Persefoni's own primary materials, so a buyer doing vendor diligence should confirm the current registered address directly with the company rather than relying on either city alone.
