Persefoni vs Plan A:Which is more popular?
In September 2026, Plan A had more branded searches than Persefoni among carbon accounting platforms worldwide. Plan A had about 76,600 branded searches, while Persefoni had 4,400. Plan A made up 93.2% of all carbon accounting platform searches we track, and Persefoni accounted for 5.4%. When we asked ChatGPT and Google AI Overviews about carbon accounting platforms, Persefoni appeared in four of the five answers and Plan A in none.
Who do people search for more?
Plan A, about 17 searches for every 1 for Persefoni
Who does AI mention more?
Persefoni, mentioned in 4 of 5 answers, Plan A in 0
Who does AI recommend more?
Persefoni, the only one of the two named
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Top carbon accounting platforms in ChatGPT and Google AI Overviews
In three ChatGPT questions and two Google AI Overviews, Persefoni was mentioned in four out of five: in all three ChatGPT answers and in one of the two Google AI Overviews. Plan A did not appear in any of the five answers.
Most recommended by AI
Brands get a higher ranking if they are mentioned earlier in the answers.
Mentioned by AI
Each dot is one answer, filled in when that answer mentions the brand.
- Persefoni4 of 5Named in 3 of 3 ChatGPT answersNamed in 1 of 2 Google answers
Watershed4 of 5Named in 3 of 3 ChatGPT answersNamed in 1 of 2 Google answers
Greenly3 of 5Named in 3 of 3 ChatGPT answersNamed in 0 of 2 Google answers
Sweep3 of 5Named in 3 of 3 ChatGPT answersNamed in 0 of 2 Google answers
Normative1 of 5Named in 1 of 3 ChatGPT answersNamed in 0 of 2 Google answers- Plan A0 of 5Named in 0 of 3 ChatGPT answersNamed in 0 of 2 Google answers
See every answer about carbon accounting platforms
5 answers
Asked ChatGPT
“Which carbon accounting platform should I use?”
Asked ChatGPT
“What are the best carbon accounting platforms?”
Asked ChatGPT
“What's the best carbon accounting platform for emissions reporting?”
Searched Google, AI Overview
“carbon accounting software”
Searched Google, AI Overview
“emissions tracking software”
Not named in any answer:
Brands are shown in the order each answer named them. The survey took place in the United States on October 20, 2026.
Is Persefoni or Plan A more popular in search?
This chart shows how often people search Google for Persefoni and Plan A by name. Each line represents a brand's share of searches for all six carbon accounting platforms we track, month by month, from English-language searches worldwide.
Share of searches by month for Plan A, Persefoni. The figures are in the table below the chart.
View monthly share of searches table
| Month | Plan A | Persefoni | Greenly | Watershed | Normative | Sweep |
|---|---|---|---|---|---|---|
| Oct 2025 | 91.4% | 7.3% | 0.53% | 0.43% | 0.23% | 0.08% |
| Nov 2025 | 91.3% | 7.3% | 0.62% | 0.43% | 0.23% | 0.09% |
| Dec 2025 | 91.7% | 7.3% | 0.38% | 0.35% | 0.18% | 0.09% |
| Jan 2026 | 92.7% | 6.2% | 0.4% | 0.45% | 0.16% | 0.1% |
| Feb 2026 | 92.1% | 6.8% | 0.38% | 0.4% | 0.23% | 0.09% |
| Mar 2026 | 94% | 5.1% | 0.33% | 0.3% | 0.14% | 0.13% |
| Apr 2026 | 92.9% | 6.1% | 0.39% | 0.36% | 0.12% | 0.1% |
| May 2026 | 93% | 6.1% | 0.34% | 0.36% | 0.14% | 0.1% |
| Jun 2026 | 92.5% | 6.5% | 0.34% | 0.39% | 0.14% | 0.08% |
| Jul 2026 | 92.4% | 6.5% | 0.37% | 0.47% | 0.1% | 0.11% |
| Aug 2026 | 93% | 6.1% | 0.34% | 0.36% | 0.11% | 0.06% |
| Sep 2026 | 93.2% | 5.4% | 0.64% | 0.47% | 0.26% | 0.09% |
How has the Persefoni and Plan A comparison changed over the last 12 months?
3 findings
- Plan A was ahead of Persefoni in every measured month of the 12 months ending September 2026.
- Across the 12 months ending September 2026, Persefoni’s share of searches among carbon accounting platforms worldwide moved from 7.3% to 5.4%, and its estimated monthly branded searches moved from 6.6K to 4.4K.
- Across the 12 months ending September 2026, Plan A’s share of searches among carbon accounting platforms worldwide moved from 91.4% to 93.2%, and its estimated monthly branded searches moved from 82.6K to 76.6K.
How did search popularity change for carbon accounting platforms worldwide in September 2026?
1 change
In September 2026, Persefoni lost share of searches among carbon accounting platforms worldwide, from 6.1% to 5.4%.
How are branded searches counted?
3 search terms
Brandwave collects information about searches that people make online using Persefoni’s and Plan A’s names. When viewed over time, estimated search volumes for these branded terms can be used to understand whether interest in the brands is growing, holding steady, or fading.
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