Buyer’s guide · Finance
Best ESG Software in 2026: Pricing & Comparison
We compared four ESG and carbon-accounting platforms on public pricing, free-plan limits, Scope 1-3 coverage and disclosure features so you can shortlist the right fit for reporting volume and team size.
- Teams that want a free self-service start for carbon accounting: Persefoni — free Pro plan for one user with unlimited assets and historical years.
- Organizations that want published package prices: Diligent ESG — AWS Marketplace lists Essentials from $33,000/year.
- Enterprises that need broad carbon program management: Watershed — quote-based, focused on Scope 1-3 and supplier engagement.
- Public companies that need linked financial and ESG reporting: Workiva — quote-based, strong on SEC, sustainability and multi-entity reporting.
ESG software helps organizations collect, calculate and report environmental, social and governance data, with a heavy emphasis on greenhouse-gas accounting (Scope 1, 2 and 3) and alignment to frameworks such as CSRD, ISSB, GRI or SEC climate rules. The category ranges from free self-service carbon tools to enterprise platforms that also cover financial reporting and controls.
We evaluated every vendor on the same fields: published pricing (free plan, trial, list price or quote), free-user or volume limits, core carbon and disclosure features, and main limitation. Order is not a quality ranking. Sort rule: public $0 / published price first, quote-led last.
| Platform | Published pricing | Free plan or trial | Best for | Link |
|---|---|---|---|---|
| 1. Persefoni | Free Pro; Advanced quote | Free forever (Pro, single user) | Teams that want free self-service carbon accounting | Visit → |
| 2. Diligent ESG | Essentials from $33,000/year on AWS Marketplace | Demo | Organizations that want published package prices | Visit → |
| 3. Watershed | Quote only | Demo | Enterprises needing Scope 1-3 and supplier engagement | Visit → |
| 4. Workiva | Quote only | Demo | Public companies needing linked financial and ESG reporting | Visit → |
Pricing checked 20 October 2026 from official pages and the AWS Marketplace listing for Diligent ESG. Published figures are list or package prices where available; most enterprise ESG platforms remain quote-led. Confirm current rates and scope before purchase.
The four companies in detail
Persefoni
Best for free self-service carbon accounting
Best for: Teams that want to start measuring Scope 1-3 emissions without a sales conversation.
| Published pricing | Free Pro; Advanced quote |
| Free plan or trial | Free forever (Pro: single user, unlimited assets and historical years) |
| Core focus | Carbon accounting, GHG metrics, sustainability disclosures |
| Main limitation | Free plan is single-user; detailed reports and support are add-ons; Advanced is quote-only |
- Free Pro plan covers unlimited assets and historical reporting years for one user.
- Advanced adds multi-user collaboration, APIs and dedicated support.
- Detailed GHG Metrics Reports and Concierge Support are paid extras even on Pro.
Diligent ESG
Best for published package prices
Best for: Organizations that want to see published annual package prices before a full sales process.
| Published pricing | Essentials $33,000/year; Pro $66,750; Pro Plus $87,500 (AWS Marketplace 12-month) |
| Free plan or trial | Demo |
| Core focus | ESG data collection, carbon accounting, audit-ready reports and framework alignment |
| Main limitation | Packages are annual contracts; final scope and any add-ons still require confirmation |
- Published 12-month package prices on AWS Marketplace starting at $33,000.
- Covers Scope 1-3 with large emission-factor library and pre-configured reports.
- Higher packages and custom deployments still need a commercial conversation.
Watershed
Best for enterprise carbon program management
Best for: Larger organizations that need broad Scope 1-3 coverage, supplier engagement and scenario planning.
| Published pricing | Quote only |
| Free plan or trial | Demo |
| Core focus | Carbon accounting, supplier engagement, targets, scenario planning and disclosures |
| Main limitation | No published prices; cost scales with data complexity and advisory services |
- Strong coverage of Scope 1, 2 and 3 with multiple data-collection methods.
- Includes supplier engagement and forward-looking scenario tools.
- Every deployment requires a sales conversation; no self-serve list price.
Workiva
Best for linked financial and ESG reporting
Best for: Public companies that need to connect financial reporting, ESG disclosures and controls in one platform.
| Published pricing | Quote only (solution-based licensing) |
| Free plan or trial | Demo |
| Core focus | Financial reporting, SEC filings, sustainability disclosures, SOX and multi-entity reporting |
| Main limitation | No published prices; typically enterprise contracts with implementation services |
- Links financial and sustainability data for consistent multi-entity reporting.
- Strong on regulated disclosures and audit trails.
- Pricing is custom by module and requires a sales conversation.
Kurums Match
I want to start measuring carbon for free
Use Persefoni Pro. It is free for one user with unlimited assets and historical years. Move to Advanced when you need multiple users or deeper support.
I want to see published package prices
Check Diligent ESG on the AWS Marketplace. Essentials starts at $33,000 for 12 months. Confirm the exact scope of each package with Diligent before you buy.
I need enterprise Scope 3 and linked financial reporting
Request quotes from Watershed and Workiva. Both are quote-led. Watershed focuses on carbon programs; Workiva adds linked financial and regulated disclosure strength.
Buying tip
Confirm which scopes (1, 2, 3) and which disclosure frameworks are included in the base package versus add-ons. Implementation, data integrations and assurance-ready reports often sit outside the core license price.
How this comparison was put together
We selected four distinct vendors with official ESG or carbon-accounting pages accessible on 20 October 2026. We recorded only published figures (Persefoni free plan, Diligent AWS Marketplace package prices) or the clear statement that pricing is quote-only. Order follows the stated sort rule and is not a quality ranking.
FAQ
Is Persefoni Pro really free?
Yes. Persefoni lists a free Pro plan for a single user with unlimited assets and historical reporting years. Some reports and support are paid add-ons.
Are the Diligent ESG AWS prices the final amount?
They are the published 12-month package prices on the AWS Marketplace listing. Confirm the exact entitlements and any additional AWS or professional-services costs before purchase.
Do Watershed and Workiva publish list prices?
No. Both are quote-led. Third-party buyer data exists but is not a vendor list price.
What is the difference between carbon accounting and full ESG software?
Carbon accounting focuses on greenhouse-gas measurement. Full ESG platforms often add social, governance, risk and multi-framework disclosure tools on top of the carbon layer.
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