Best Plan A Alternatives in 2026
Updated
20 platforms from carbon accounting software ranked against Plan A on the same published basis.
- 1Plan A vs Carbonfact
- 2Plan A vs CarbonTool
- 3Plan A vs Greenio
- 4Plan A vs Persefoni
- 5Plan A vs CO2 AI
- 6Plan A vs CarbonAnalytics
- 7Plan A vs BigMile
- 8Plan A vs CarbonChain
- 9Plan A vs ACT Group Decarbonization Platform
- 10Plan A vs CarbonSmart
- 11Plan A vs Carbonstop Ccloud
- 12Plan A vs EcoReko
- 13Plan A vs Hedgehog Carbon Platform
- 14Plan A vs Normative
- 16Plan A vs SINAI Technologies
- 17Plan A vs Sweep
- 18Plan A vs Vaayu
- 19Plan A vs Watershed
- 20Plan A vs 50X Impact
- 21Plan A vs Arbor
Plan A alternatives compared
| # | Platform | Score | Free plan | From | Runs on |
|---|---|---|---|---|---|
| 1 | Carbonfact | 7.4 | Free plan | Free | API, Web |
| 2 | CarbonTool | 7.4 | Free plan | $166.67/mo | API, Web |
| 3 | Greenio | 7.3 | Free plan | ₹2,999/mo | API, Web |
| 4 | Persefoni | 7.3 | Free plan | Free | API, Web |
| 5 | CO2 AI | 7.0 | No | — | API, Web |
| 6 | CarbonAnalytics | 6.8 | No | £69.99/mo | API, Web |
| 7 | BigMile | 6.7 | No | — | API, Web |
| 8 | CarbonChain | 6.7 | No | — | API, Web |
| 9 | ACT Group Decarbonization Platform | 5.2 | No | — | Web |
| 10 | CarbonSmart | 5.2 | No | — | Web |
| 11 | Carbonstop Ccloud | 5.2 | No | — | Web |
| 12 | EcoReko | 5.2 | No | — | Web |
| 13 | Hedgehog Carbon Platform | 5.2 | No | — | Web |
| 14 | Normative | 5.2 | No | — | Web |
| 16 | SINAI Technologies | 5.2 | No | — | Web |
| 17 | Sweep | 5.2 | No | — | Web |
| 18 | Vaayu | 5.2 | No | — | Web |
| 19 | Watershed | 5.2 | No | — | Web |
| 20 | 50X Impact | 5.1 | No | — | Web |
| 21 | Arbor | 5.1 | No | — | Web |
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Questions about Plan A alternatives
What is the best alternative to Plan A?
Carbonfact, number 1 in carbon accounting software with a score of 7.4 out of 10. The others here: CarbonTool, Greenio, Persefoni and 16 more.
What is the best free alternative to Plan A?
Carbonfact is the best-ranked alternative with a free plan. 4 of the 20 alternatives here publish a free plan on their own pricing pages.
How are these alternatives ranked?
Ranked on what each maker publishes, open and connectable first: a public API, open-source code, the depth of its documentation and a free tier to try it on. Model lists are sorted by the figure in their title, exactly as each provider publishes it.