Best Carbon Accounting Software in 2026
Updated
In short: CarbonTool is ranked #1 of 29 as of 7 October 2026, ahead of Greenio and Carbonfact. The best-ranked option with a free plan is Greenio. The lowest first paid tier on this page is CarbonAnalytics at £69.99/mo.
Tracking organizational emissions involves collecting relevant data, accounting for it across scopes, and understanding where suppliers fit into the process. Compare data collection, emissions factors, and scope coverage to see how each option represents the work you need to manage. Audit trail and API access are worth weighing for recordkeeping and integration needs; supplier engagement can matter when emissions information extends beyond your organization. CarbonTool, Greenio, and Carbonfact are among the options to consider. Free-plan availability and paid-from pricing offer additional context as you assess which listed capabilities align with your accounting process and the emissions information you need to handle.
29 carbon accounting software ranked on what their makers publish — plans and prices, free tiers, platforms and the facts on their own pages.
Carbon Accounting Software, ranked on how quickly a newcomer can get going. 12 of the 25 on this page can be tried for free.
- 1 CarbonToolPaid from $166.67/mo
- Free to practise on: yes
- Free trial: yes
- Well documented: yes
- Runs where you work: not on record
- 2 GreenioPaid from ₹2,999/mo
- Free to practise on: yes
- Free trial: yes
- Well documented: yes
- Runs where you work: not on record
- 3 CarbonfactFree plan
- Free to practise on: yes
- Free trial: not on record
- Well documented: yes
- Runs where you work: not on record
- 4 CO2 AI
- Free to practise on: not on record
- Free trial: yes
- Well documented: yes
- Runs where you work: not on record
- 5 EcoRekoPaid from €375/mo
- Free to practise on: yes
- Free trial: not on record
- Well documented: yes
- Runs where you work: not on record
- 6 GreenStitchPaid from $250/mo
- Free to practise on: not on record
- Free trial: yes
- Well documented: yes
- Runs where you work: not on record
- 7 PersefoniFree plan
- Free to practise on: yes
- Free trial: not on record
- Well documented: yes
- Runs where you work: not on record
- 8 BigMile
- Free to practise on: not on record
- Free trial: yes
- Well documented: yes
- Runs where you work: not on record
- 9 CarbonAnalyticsPaid from £69.99/mo
- Free to practise on: not on record
- Free trial: yes
- Well documented: yes
- Runs where you work: not on record
- 10 NetNada
- Free to practise on: not on record
- Free trial: yes
- Well documented: yes
- Runs where you work: not on record
- 11 Normative
- Free to practise on: not on record
- Free trial: not on record
- Well documented: yes
- Runs where you work: not on record
- 12 Plan A
- Free to practise on: not on record
- Free trial: not on record
- Well documented: yes
- Runs where you work: not on record
- 13 Sweep
- Free to practise on: not on record
- Free trial: not on record
- Well documented: yes
- Runs where you work: not on record
- 14 CarbonChain
- Free to practise on: not on record
- Free trial: not on record
- Well documented: yes
- Runs where you work: not on record
- 15 ACT Group Decarbonization Platform
- Free to practise on: not on record
- Free trial: not on record
- Well documented: yes
- Runs where you work: not on record
- 16 CarbonInkFree plan
- Free to practise on: not on record
- Free trial: not on record
- Well documented: not on record
- Runs where you work: not on record
- 17 CarbonSmart
- Free to practise on: not on record
- Free trial: not on record
- Well documented: yes
- Runs where you work: not on record
- 18 Carbonstop Ccloud
- Free to practise on: not on record
- Free trial: not on record
- Well documented: not on record
- Runs where you work: not on record
- 19 Hedgehog Carbon PlatformPaid from €100/mo
- Free to practise on: not on record
- Free trial: not on record
- Well documented: not on record
- Runs where you work: not on record
- 20 SINAI Technologies
- Free to practise on: not on record
- Free trial: not on record
- Well documented: yes
- Runs where you work: not on record
- 21 Vaayu
- Free to practise on: not on record
- Free trial: not on record
- Well documented: not on record
- Runs where you work: not on record
- 22 Watershed
- Free to practise on: not on record
- Free trial: not on record
- Well documented: yes
- Runs where you work: not on record
- 23 50X Impact
- Free to practise on: not on record
- Free trial: not on record
- Well documented: not on record
- Runs where you work: not on record
- 24 Arbor
- Free to practise on: not on record
- Free trial: not on record
- Well documented: not on record
- Runs where you work: not on record
- 25 scoped
- Free to practise on: not on record
- Free trial: not on record
- Well documented: not on record
- Runs where you work: not on record
Compare all 25 in a table
| # | Platform | Score | Free plan | From | Free plan | Paid from | Scope coverage | Data collection |
|---|---|---|---|---|---|---|---|---|
| 1 | CarbonTool | 7.7 | Free plan | $166.67/mo | No | — | scope 1-3 | both |
| 2 | Greenio | 7.6 | Free plan | ₹2,999/mo | Yes | — | scope 1-3 | both |
| 3 | Carbonfact | 7.1 | Free plan | Free | No | — | scope 1-3 | both |
| 4 | CO2 AI | 7.1 | No | — | No | — | scope 1-3+ | both |
| 5 | EcoReko | 7.1 | Free plan | €375/mo | Yes | — | scope 1-3 | both |
| 6 | GreenStitch | 6.8 | No | $250/mo | No | — | scope 1-3 | both |
| 7 | Persefoni | 6.8 | Free plan | Free | Yes | — | scope 1-3 | both |
| 8 | BigMile | 6.7 | No | — | No | — | scope 1-3 | both |
| 9 | CarbonAnalytics | 6.7 | No | £69.99/mo | No | — | scope 1-3 | both |
| 10 | NetNada | 6.7 | No | — | No | — | scope 1-3 | both |
| 11 | Normative | 6.4 | No | — | — | — | scope 1-3 | both |
| 12 | Plan A | 6.4 | No | — | — | — | scope 1-3 | both |
| 13 | Sweep | 6.4 | No | — | — | — | scope 1-3 | both |
| 14 | CarbonChain | 6.1 | No | — | No | — | scope 1-3 | both |
| 15 | ACT Group Decarbonization Platform | 5.9 | No | — | — | — | scope 1-3 | both |
| 16 | CarbonInk | 5.9 | Free plan | Free | Yes | — | scope 1-3 | automated |
| 17 | CarbonSmart | 5.9 | No | — | — | — | scope 1-3 | both |
| 18 | Carbonstop Ccloud | 5.9 | No | — | — | — | scope 1-3 | both |
| 19 | Hedgehog Carbon Platform | 5.9 | Free plan | €100/mo | Yes | — | scope 1-3 | manual |
| 20 | SINAI Technologies | 5.9 | No | — | — | — | scope 1-3 | both |
| 21 | Vaayu | 5.9 | No | — | — | — | scope 1-3 | both |
| 22 | Watershed | 5.9 | No | — | — | — | scope 1-3 | both |
| 23 | 50X Impact | 5.8 | No | — | — | — | scope 1-3 | both |
| 24 | Arbor | 5.8 | No | — | — | — | scope 1-3 | both |
| 25 | scoped | 5.8 | No | — | — | — | scope 1-3 | both |
Is your platform on this list?
Numbered spots on this list can be sponsored, and a sponsored row is labelled as paid.
Questions about this list
Which carbon accounting software is ranked first on The Geeks Club?
CarbonTool is ranked #1 of 29 with a score of 7.7. Greenio is second and Carbonfact third.
How many of these have a free plan?
7 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 how quickly a newcomer can get going: documentation depth, a free tier or trial, and the platforms it runs on.