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.
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.
29 carbon accounting software ranked on what their makers publish — plans and prices, free tiers, platforms and the facts on their own pages.
Recognised 40% · Phone app 26% · Documented 20% · Free plan 14% of the score
- 1 Carbonfact No phone app RecognisedPhone appDocumentedFree plan 6.4Free Scope coverage: scope 1-3Data collection: bothEmissions factors: both
- 2 CarbonTool No phone app RecognisedPhone appDocumentedFree plan 6.4$166.67/mo Scope coverage: scope 1-3Data collection: bothEmissions factors: both
- 3 Greenio No phone app RecognisedPhone appDocumentedFree plan 6.3₹2,999/mo Scope coverage: scope 1-3Data collection: bothEmissions factors: built-in
- 4 Persefoni No phone app RecognisedPhone appDocumentedFree plan 6.3Free Scope coverage: scope 1-3Data collection: bothEmissions factors: both
- 5 CO2 AI No phone app RecognisedPhone appDocumentedFree plan 5.9 Scope coverage: scope 1-3+Data collection: bothEmissions factors: both
- 6 BigMile No phone app RecognisedPhone appDocumentedFree plan 5.5 Scope coverage: scope 1-3Data collection: bothEmissions factors: built-in
- 7 CarbonAnalytics No phone app RecognisedPhone appDocumentedFree plan 5.5£69.99/mo Scope coverage: scope 1-3Data collection: bothEmissions factors: both
- 8 CarbonChain No phone app RecognisedPhone appDocumentedFree plan 5.5 Scope coverage: scope 1-3Data collection: bothEmissions factors: both
- 9 ACT Group Decarbonization Platform No phone app RecognisedPhone appDocumentedFree plan 5.4 Scope coverage: scope 1-3Data collection: bothEmissions factors: built-in
- 10 CarbonSmart No phone app RecognisedPhone appDocumentedFree plan 5.4 Scope coverage: scope 1-3Data collection: bothEmissions factors: both
- 11 Carbonstop Ccloud No phone app RecognisedPhone appDocumentedFree plan 5.4 Scope coverage: scope 1-3Data collection: bothEmissions factors: built-in
- 12 EcoReko No phone app RecognisedPhone appDocumentedFree plan 5.4 Scope coverage: scope 1-3Data collection: bothEmissions factors: built-in
- 13 Hedgehog Carbon Platform No phone app RecognisedPhone appDocumentedFree plan 5.4 Scope coverage: scope 1-3Data collection: manualEmissions factors: both
- 14 Normative No phone app RecognisedPhone appDocumentedFree plan 5.4 Scope coverage: scope 1-3Data collection: bothEmissions factors: built-in
- 15 Plan A No phone app RecognisedPhone appDocumentedFree plan 5.4 Scope coverage: scope 1-3Data collection: bothEmissions factors: built-in
- 16 SINAI Technologies No phone app RecognisedPhone appDocumentedFree plan 5.4 Scope coverage: scope 1-3Data collection: bothEmissions factors: both
- 17 Sweep No phone app RecognisedPhone appDocumentedFree plan 5.4 Scope coverage: scope 1-3Data collection: bothEmissions factors: both
- 18 Vaayu No phone app RecognisedPhone appDocumentedFree plan 5.4 Scope coverage: scope 1-3Data collection: bothEmissions factors: built-in
- 19 Watershed No phone app RecognisedPhone appDocumentedFree plan 5.4 Scope coverage: scope 1-3Data collection: bothEmissions factors: both
- 20 50X Impact No phone app RecognisedPhone appDocumentedFree plan 5.3 Scope coverage: scope 1-3Data collection: bothEmissions factors: built-in
- 21 Arbor No phone app RecognisedPhone appDocumentedFree plan 5.3 Scope coverage: scope 1-3Data collection: bothEmissions factors: both
- 22 CarbonInk No phone app RecognisedPhone appDocumentedFree plan 5.3 Scope coverage: scope 1-3Data collection: automated
- 23 scoped No phone app RecognisedPhone appDocumentedFree plan 5.3 Scope coverage: scope 1-3Data collection: bothEmissions factors: both
- 24 GreenStitch No phone app RecognisedPhone appDocumentedFree plan 5.2 Scope coverage: scope 1-3Data collection: bothEmissions factors: both
- 25 NetNada No phone app RecognisedPhone appDocumentedFree plan 5.2 Scope coverage: scope 1-3Data collection: bothEmissions factors: both
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 Samsung Mobile US Press?
Carbonfact is ranked #1 of 29 with a score of 6.4. 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 mobile-first: a phone app alongside the web or desktop product, a free tier and the depth of its documentation. Paid placements never change a rank.