CarbonTool suits organizations that need emissions measurement and framework-based reporting, from single-entity companies to large CSRD-obligated organizations.
Free plan Free trial From €2,000 a year WebAPI
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Best Carbon Accounting Software 2026
Facts read 30 Sep 2026 – 3 Nov 2026
Managing emissions data often involves collection, accounting, and coordination with suppliers. Compare Persefoni, Carbonfact, and ACT Group Decarbonization Platform on data collection, emissions factors, and scope coverage to see which aspects of your work they address. Audit trail and API access offer additional points to assess, alongside supplier engagement. The comparison also includes free plans and paid-from pricing, so you can consider access and cost with the listed capabilities. Think about the emissions information you need to organize, the scopes relevant to your reporting, and whether supplier participation or integrations matter to your process. The entries are presented in ranked order, with those dimensions available to guide your comparison.
The standings: top 10
| Name | In a line | Record score | Price from | Try it free | Runs on | Facts read |
|---|---|---|---|---|---|---|
| 01 CarbonTool | CarbonTool suits organizations that need emissions measurement and framework-based reporting, from single-entity companies to large CSRD-obligated organizations. | 5.4 | €2,000 a year | Free plan | Web, API | 3 Oct 2026 |
| 02 Greenio | Greenio is intended for Indian companies with 1–250 employees, including operations and finance teams without carbon-accounting specialization. | 5.1 | ₹2,999 a month | Free plan | Web, API | 30 Sep 2026 |
| 03 TrackZero | 4.9 | £295 a year | Free trial | Web | 8 Oct 2026 | |
| 04 GreenStitch | 4.8 | $3,000 a year | Free trial | Web, API | 7 Oct 2026 | |
| 05 Hedgehog Carbon Platform | The platform suits organizations that need to track emissions across scopes, sites, and team roles, and prepare reports. | 4.8 | €100 a month, billed yearly | Free plan | Web | 8 Oct 2026 |
| 06 EcoReko | EcoReko suits SMEs, particularly businesses in Ireland and the United Kingdom, that need emissions tracking across all three GHG scopes. | 4.7 | €4,500 a year | Free plan | Web | 7 Oct 2026 |
| 07 ClimateTracker | 4.6 | — | — | Web | 21 Oct 2026 | |
| 08 CO2 AI | It is aimed at enterprise clients, especially complex global organizations managing corporate, product, and supplier emissions. | 4.5 | Free plan | Free plan | Web, API | 4 Oct 2026 |
| 09 Vaayu | Vaayu suits retail brands and businesses that need to measure company and product impacts, including supply-chain emissions. | 4.5 | Free plan | Free plan | Web, API | 11 Oct 2026 |
| 10 CarbonAnalytics | 4.4 | £69.99 a month | Free trial | Web, API | 3 Oct 2026 |
02
Greenio
Greenio is intended for Indian companies with 1–250 employees, including operations and finance teams without carbon-accounting specialization.
WebAPI Record5.1 Visit
03
TrackZero
Web Record4.9 Visit
04
GreenStitch
WebAPI Record4.8 Visit
05
Hedgehog Carbon Platform
The platform suits organizations that need to track emissions across scopes, sites, and team roles, and prepare reports.
Web Record4.8 Visit
6
EcoReko
Web €4,500 a year Record4.7 Visit EcoReko suits SMEs, particularly businesses in Ireland and the United Kingdom, that need emissions tracking across all three GHG scopes.
8
CO2 AI
WebAPI Free plan Record4.5 Visit It is aimed at enterprise clients, especially complex global organizations managing corporate, product, and supplier emissions.
9
Vaayu
WebAPI Free plan Record4.5 Visit Vaayu suits retail brands and businesses that need to measure company and product impacts, including supply-chain emissions.
11
Persefoni
WebAPI Free plan Record4.3 Visit Pro is aimed at companies with low to medium operational complexity.
12
CarbonInk
WindowsMac Free plan Record4.2 Visit CarbonInk suits people who need to track greenhouse-gas emissions across Scopes 1–3 and produce an inventory report.
18
Carbonfact
WebAPI — Record3.9 Visit Carbonfact is intended for apparel and footwear businesses working on emissions accounting, product assessments, reporting, or reduction planning.
19
Arbor
WebAPI $1,250 a month, billed yearly Record3.8 Visit Arbor suits sustainability teams measuring products, company assets and organisational emissions across Scopes 1–3.
21
50X Impact
Web — Record3.7 Visit It is designed for sports organisations, venues, conference centres, festivals, and events managing emissions and sustainability compliance.
23
CarbonSmart
WebAPISelf-hosted — Record3.7 Visit CarbonSmart suits companies managing corporate, product, CBAM, or LCA emissions data.
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