Best Carbon Accounting Software in 2026
Updated
In short: Carbonfact is ranked #1 of 29 as of 4 October 2026, ahead of CarbonTool and Greenio. The best-ranked option with a free plan is CarbonTool. The lowest first paid tier on this page is CarbonAnalytics at £69.99/mo.
Carbon accounting software helps you organize emissions information and account for it across the areas your work needs to cover. The ranking starts with Persefoni, Carbonfact, and ACT Group Decarbonization Platform. Compare data collection, emissions factors, and scope coverage to see how each option aligns with the information you need to manage. Audit trails and API access offer further points to weigh, while supplier engagement may matter if your process involves suppliers. Free plans and paid starting prices round out the comparison. Consider which emissions data, integrations, and supplier-related tasks are central to your work, then use the listed criteria to compare coverage and access.
29 carbon accounting software ranked on what their makers publish — plans and prices, free tiers, platforms and the facts on their own pages.
#1 Carbonfact Top pick · 7.0 Free plan · Free
#2 CarbonTool Runner-up · 6.9 Free plan · $166.67/mo
#3 Greenio Also great · 6.9 Free plan · ₹2,999/mo- Free plan apiWeb
- Free plan
- No
- Scope coverage
- scope 1-3
- Data collection
- both
- Emissions factors
- both
- Supplier engagement
- Yes
RecognisedDocumentedFree planPlatforms - Free planFree trial apiWeb
- Free plan
- No
- Scope coverage
- scope 1-3
- Data collection
- both
- Emissions factors
- both
- Supplier engagement
- Yes
RecognisedDocumentedFree planPlatforms$166.67/mofirst paid tier About CarbonToolVisit site - Free planFree trial apiWeb
- Free plan
- Yes
- Scope coverage
- scope 1-3
- Data collection
- both
- Emissions factors
- built-in
- Supplier engagement
- Yes
RecognisedDocumentedFree planPlatforms₹2,999/mofirst paid tier About GreenioVisit site - Free plan apiWeb
- Free plan
- Yes
- Scope coverage
- scope 1-3
- Data collection
- both
- Emissions factors
- both
- Supplier engagement
- Yes
RecognisedDocumentedFree planPlatforms - Free trial apiWeb
- Free plan
- No
- Scope coverage
- scope 1-3+
- Data collection
- both
- Emissions factors
- both
- Supplier engagement
- Yes
RecognisedDocumentedFree planPlatforms - Free trial apiWeb
- Free plan
- No
- Scope coverage
- scope 1-3
- Data collection
- both
- Emissions factors
- built-in
- Supplier engagement
- Yes
RecognisedDocumentedFree planPlatforms - Free trial apiWeb
- Free plan
- No
- Scope coverage
- scope 1-3
- Data collection
- both
- Emissions factors
- both
- Supplier engagement
- Yes
RecognisedDocumentedFree planPlatforms£69.99/mofirst paid tier About CarbonAnalyticsVisit site - apiWeb
- Free plan
- No
- Scope coverage
- scope 1-3
- Data collection
- both
- Emissions factors
- both
- Supplier engagement
- Yes
RecognisedDocumentedFree planPlatforms - Web
- Scope coverage
- scope 1-3
- Data collection
- both
- Emissions factors
- built-in
- Supplier engagement
- Yes
RecognisedDocumentedFree planPlatforms - WindowsmacOS
- Free plan
- Yes
- Scope coverage
- scope 1-3
- Data collection
- automated
- Supplier engagement
- Yes
RecognisedDocumentedFree planPlatforms - Web
- Scope coverage
- scope 1-3
- Data collection
- both
- Emissions factors
- both
- Supplier engagement
- Yes
RecognisedDocumentedFree planPlatforms - Web
- Scope coverage
- scope 1-3
- Data collection
- both
- Emissions factors
- built-in
- Supplier engagement
- Yes
RecognisedDocumentedFree planPlatforms - Web
- Free plan
- Yes
- Scope coverage
- scope 1-3
- Data collection
- both
- Emissions factors
- built-in
- Supplier engagement
- No
RecognisedDocumentedFree planPlatforms - Web
- Free plan
- Yes
- Scope coverage
- scope 1-3
- Data collection
- manual
- Emissions factors
- both
- Supplier engagement
- Yes
RecognisedDocumentedFree planPlatforms - Web
- Scope coverage
- scope 1-3
- Data collection
- both
- Emissions factors
- built-in
- Supplier engagement
- Yes
RecognisedDocumentedFree planPlatforms - Web
- Scope coverage
- scope 1-3
- Data collection
- both
- Emissions factors
- built-in
- Supplier engagement
- Yes
RecognisedDocumentedFree planPlatforms - Web
- Scope coverage
- scope 1-3
- Data collection
- both
- Emissions factors
- both
- Supplier engagement
- Yes
RecognisedDocumentedFree planPlatforms - Web
- Scope coverage
- scope 1-3
- Data collection
- both
- Emissions factors
- both
- Supplier engagement
- Yes
RecognisedDocumentedFree planPlatforms - Web
- Scope coverage
- scope 1-3
- Data collection
- both
- Emissions factors
- built-in
- Supplier engagement
- Yes
RecognisedDocumentedFree planPlatforms - Web
- Scope coverage
- scope 1-3
- Data collection
- both
- Emissions factors
- both
- Supplier engagement
- Yes
RecognisedDocumentedFree planPlatforms - Web
- Scope coverage
- scope 1-3
- Data collection
- both
- Emissions factors
- built-in
- Supplier engagement
- Yes
RecognisedDocumentedFree planPlatforms - Web
- Scope coverage
- scope 1-3
- Data collection
- both
- Emissions factors
- both
- Supplier engagement
- Yes
RecognisedDocumentedFree planPlatforms - Web
- Scope coverage
- scope 1-3
- Data collection
- both
- Emissions factors
- both
- Supplier engagement
- Yes
RecognisedDocumentedFree planPlatforms - Web
- Free plan
- No
- Scope coverage
- scope 1-3
- Data collection
- both
- Emissions factors
- both
- Supplier engagement
- Yes
RecognisedDocumentedFree planPlatforms - Web
- Free plan
- No
- Scope coverage
- scope 1-3
- Data collection
- both
- Emissions factors
- both
- Supplier engagement
- Yes
RecognisedDocumentedFree planPlatforms
Is your app on this list?
Numbered spots on this list can be sponsored. They are labelled, and the editorial order and scores never change for payment.
Questions about this list
Which carbon accounting software is ranked first on Everything Xiaomi?
Carbonfact is ranked #1 of 29 with a score of 7.0. CarbonTool is second and Greenio third.
How many of these have a free plan?
4 of the 25 on this page publish a free plan on their own pricing pages.
Which is the cheapest paid option?
On this page, CarbonAnalytics has the lowest first paid tier we found: £69.99/mo.
How is this list ranked?
Ranked on what each maker publishes: documentation depth, a free tier and the platforms it runs on. Paid placements never change a rank.